Friday, May 31, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 380


Conditions for Setting the DTC



B1395 03



The BCM detects a voltage that is lower than 0.33 V on the I/P dimming voltage reference circuit.



B1395 07



The BCM detects a voltage that is greater than 4.97 V on I/P dimming voltage reference circuit.



Action Taken When the DTC Sets



* The I/P lamps are dim or not illuminated.



* The I/P lamps will not dim.



* The stop lamps are always ON.



Conditions for Clearing the DTC



* The conditions for setting the DTC are no longer present.



* A history DTC clears after 100 malfunction-free ignition cycles.



* The BCM receives the clear code command from the scan tool.



Reference Information



Schematic Reference



* Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming



Schematics)



* Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the headlamp and panel dimmer switch.



2. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 8 and B+.



锟斤拷 If the test lamp does not illuminate, test the ground circuit for an open/high resistance.



3. Ignition ON, verify the scan tool Dimming Control Signal parameter is less than 0.1 V.



锟斤拷 If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM.



4. Ignition ON, test for 12 V between the I/P dimming voltage reference circuit terminal 15 and ground.



锟斤拷 If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,



replace the BCM.



5. Install a 3 A fused jumper wire between the signal circuit terminal 13 and the voltage reference circuit terminal 15. Verify the scan tool BCM



Dimming Control Signal parameter is greater than 2.6 V.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 314


Speakers located in the front A-pillar are connected to the same channel as the speaker in the door. A DTC will only set after the amplifier only on



up-level radios.



Reference Information



Schematic Reference



Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System



Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Radio ON, adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and



even sound.



Circuit/System Testing



Important: This DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose the appropriate audio output



circuits to the speakers or the low level inputs to the amplifier (if equipped). If the DTC was set by the amplifier, diagnose audio output



signals to the speakers from the amplifier. If equipped with rear seat audio (RSA) (U42), the RSA must be turned off to perform proper



speaker testing.



Without Amplifier



1. Ignition OFF, disconnect the harness connector at the appropriate speaker.



2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



3. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



4. If all circuits test normal, replace the speaker.



DTC Set By The Radio UQA



1. Ignition OFF, disconnect the X3 harness connector at the amplifier.



2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left front low level audio signal (+) - terminal 15



* Left front low level audio signal (-) - terminal 7



* Right front low level audio signal (+) - terminal 14



* Right front low level audio signal (-) - terminal 6



* Left rear low level audio signal (+) - terminal 13



* Left rear low level audio signal (-) - terminal 5



* Right rear low level audio signal (+) - terminal 12



* Right rear low level audio signal (-) - terminal 4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 674


Conditions for Setting the DTC



If the BCM detects a short to ground in the WIPER 1 relay control circuit.



Action Taken When the DTC Sets



The BCM will not activate the output.



Conditions for Clearing the DTC



* The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.



* The history DTC will clear after 50 consecutive ignition cycles without a fault present.



Reference Information



Schematic Reference



Wiper/Washer Schematics (See: Wiper and Washer Systems/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Wiper/Washer System Description and Operation (See: Wiper and Washer Systems/Description and Operation/Wiper/Washer System Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Ignition ON, wiper switch in LOW position. Verify the windshield wipers are cycling at the low speed.



Circuit/System Testing



1. Ignition OFF, disconnect the X5 harness connector at the BCM.



2. Ignition ON, verify that the low speed wipers are not on.



锟斤拷 If the low speed wipers are on, test the WIPER 1 relay control circuit terminal 20 for a short to voltage. If the circuit tests normal, replace



the underhood fuse block.



3. Install a 10A fused jumper wire between the WIPER 1 relay control circuit terminal 20 and B+. Verify the low speed wipers are on.



锟斤拷 If the low speed wipers are not on, test the relay control circuit for an open/high resistance or short to ground. If the circuit tests normal



replace the underhood fuse block.



4. If all circuits test normal, replace the BCM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and



Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming



B3779



DTC B0228, B0413, B0423, B0433, B3779, or B3782

Thursday, May 30, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 99


If the test lamp is always OFF



11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.



11.2Test for less than 1 V between the control circuit and ground.



-If 1 V or greater, repair the short to voltage on the circuit.



鈬揑f less than 1 V



11.3Ignition OFF.



11.4Test for less than 2 锟?in the control circuit end to end.



-If 2 锟?or greater, repair the open/high resistance in the circuit.



-If less than 2 锟? replace the Assist Step Control Module.



-



If the test lamp is always ON



11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.



11.2Test for infinite resistance between the control circuit and ground.



-If less than infinite resistance, repair the short to ground on the circuit.



-If infinite resistance, replace the Assist Step Control Module.



锟?If the test lamp turns ON and OFF



12.Test or replace the appropriate assist step motor.



Repair Instructions



Perform the Diagnostic Repair Verification after completing the repair.



- Assist Step Motor Replacement



- Control Module References for Assist Step Control Module replacement, programming and setup.



B051C



DTC B051A, B051B, B051C, or B051D



Diagnostic Instructions



-Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.



-Review Strategy Based Diagnosis for an overview of the diagnostic approach.



- Diagnostic Procedure Instructions provides an overview of each diagnostic category.



DTC Descriptors



DTC B051A 0B:Left Side Assist Step Motor Control Circuit Current Above Threshold



DTC B051A 01:Left Side Assist Step Motor Control Circuit Short to Battery



DTC B051A 02:Left Side Assist Step Motor Control Circuit Short to Ground



DTC B051A 04:Left Side Assist Step Motor Control Circuit Open Circuit



DTC B051B 0B:Right Side Assist Step Motor Control Circuit Current Above Threshold



DTC B051B 01:Right Side Assist Step Motor Control Circuit Short to Battery



DTC B051B 02:Right Side Assist Step Motor Control Circuit Short to Ground



DTC B051B 04:Right Side Assist Step Motor Control Circuit Open Circuit



DTC B051C 01:10 V Reference Circuit Short to Battery

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 293


Conditions for Setting the DTC



* The 4-digit primary data key stored in the SDM does not match the 4 digits stored in the BCM.



* The VIN stored in the BCM is not in the acceptable range of VINs allowed by the SDM calibration.



Action Taken When the DTC Sets



* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.



* The SDM disables all deployments.



Conditions for Clearing the DTC



* The last 4-digit Primary Data Key in the SDM match the last 4 digits stored in the BCM.



* The VIN stored in the BCM is in the acceptable range of VINs allowed by the SDM calibration.



Diagnostic Aids



This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replaced without reprogramming



the BCM with the new information.



Reference Information



Schematic Reference



SIR Schematics (See: Diagrams/Electrical Diagrams/Air Bag Systems)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag Systems/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or



replacement of the affected.



* SDM



* SDM wiring harness



1. Ignition ON, verify the scan tool Primary Key Status displays Valid.



锟斤拷 If not the specified value, verify the scan tool SDM Primary Key matches the Received Primary Key. If the key does not match, perform



the Setup SDM Primary Key in BCM procedure.



2. Ignition ON, verify the scan tool Secondary Key Status displays Valid.



锟斤拷 If not the specified value, verify the scan tool received VIN Digits 2-7 match the vehicle VIN.



* If the VIN does not match, reprogram the BCM and perform the Setup SDM Primary Key in BCM procedure.



* If the VIN matches, reprogram the SDM, ensure the correct SDM calibration is used and perform the Setup SDM Primary Key in BCM

Wednesday, May 29, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 448


3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 6 and ground.



锟斤拷 If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,



replace the MSM.



锟斤拷 If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.



4. Verify the appropriate scan tool driver seat sensor parameter is less than 1 volt.



锟斤拷 If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* Seat front vertical position sensor terminal 1



* Seat rear vertical position sensor terminal 5



* Seat horizontal position sensor terminal 3



5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal 6. Verify the



appropriate scan tool driver seat position sensor parameter is greater than 4.75 volts.



* Seat horizontal position sensor terminal 3



* Seat front vertical position sensor terminal 1



* Seat rear vertical position sensor terminal 5



锟斤拷 If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



6. If all circuits test normal, test or replace the seat position sensor.



B1850 01, B1850 06, B1860 01 or B1860 06



1. Ignition OFF, disconnect the X2 harness connector at the lumbar adjuster assembly.



2. Test for less than 2 ohms between the low reference circuit terminal C and ground.



锟斤拷 If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.



3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.



锟斤拷 If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,



replace the MSM.



锟斤拷 If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.



4. Verify the appropriate scan tool lumbar sensor parameter is less than 1 volt.



锟斤拷 If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* Lumbar vertical position sensor terminal B



* Lumbar horizontal position sensor terminal D



5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal A. Verify the



appropriate scan tool lumbar sensor parameter is greater than 4.75 volts.



* Lumbar vertical position sensor terminal B



* Lumbar horizontal position sensor terminal D



锟斤拷 If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



6. If all circuits test normal, test or replace the lumbar position sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Front Seat Adjuster Replacement (with HP2) ()Front Seat Adjuster Replacement (without HP2) ()



* Seat Lumbar Sub System Replacement ()



* Front Seat Recliner Actuator Motor Replacement ()



* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 76


DTC B0022 04



- Passenger Seat Belt Retractor Pretensioner Deployment Loop Open Circuit



DTC B0022 0D



- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Above Threshold



DTC B0022 0E



- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Below Threshold



DTC B0023 01



- Right Roof Rail Air Bag Deployment Loop Short to Battery



DTC B0023 02



- Right Roof Rail Air Bag Deployment Loop Short to Ground



DTC B0023 04



- Right Roof Rail Air Bag Deployment Loop Open Circuit



DTC B0023 0D



- Right Roof Rail Air Bag Deployment Loop Resistance Above Threshold



DTC B0023 0E



- Right Roof Rail Air Bag Deployment Loop Resistance Below Threshold



Diagnostic Fault Information



Circuit/System Description



During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the



deployment loop in order to deploy the air bag module. There are 2 shorting bars used within the module connector which will short together both



high and low circuits, when the connector is disconnected. This will prevent unwanted deployment of the inflator module during servicing.



Conditions for Running the DTC



Ignition voltage is between 9-16 V.



Conditions for Setting the DTC



B0014 01, B0015 01, B0016 01, B0019 01, B0020 01, B0021 01, B0022 01, B0023 01



The air bag or seat belt retractor pretensioner high and/or low control circuit is shorted to voltage for 120 milliseconds.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 696


Description and Operation



Power Windows Description and Operation (See: Windows and Glass/Windows/Description and Operation/Power Windows Description and



Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Ignition ON, command the rear windows UP and DOWN by using the window switches on the driver master control and their respective rear



window switches. The rear windows should perform the UP and DOWN function from each switch.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.



2. Ignition ON, enable the rear window switches by pressing the window lockout switch on the driver master control.



3. Test for greater than 9 volts between the control circuit terminal D and ground.



锟斤拷 If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the



BCM.



4. If all circuits test normal, replace the rear window switch.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Rear Side Door Window Switch Replacement (See: Windows and Glass/Windows/Service and Repair/Rear Side Door Window Switch



Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup and programming



B3844



DTC B3844



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B3844



- Heater Core Pump Circuit



Diagnostic Fault Information



Circuit/System Description

Tuesday, May 28, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 584


Diagram/Headlights/Daytime Running Lights (DRL) Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition OFF, disconnect the X4 harness connector at the underhood fuse block.



2. Connect a test lamp between the control circuit terminal C3 and B+.



3. Command the High Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded



states.



锟斤拷 If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.



锟斤拷 If the test lamp is always OFF, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the



BCM.



4. If all circuits test normal, test or replace the underhood fuse block.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and



Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming



B2585



DTC B2585



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B2585 00



- Park Lamp Control Circuit



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 266


- All doors closed, key OFF - indicator dimming control circuit voltage = B+ (high current - enough to light a test light).



- All doors closed, key ON, engine OFF - indicator dimming control circuit voltage = diagnostic B+.



- Key ON, engine OFF. Place a shop light on the DRL sensor. When the DRL sensor commands the headlights OFF, the indicator dimming



control circuit voltage, TCSCS X1 pin 4, will go from a diagnostic B+ to a true B+.



Reference Information



Schematic Reference



Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3023/3024-NQH - Transfer



Case)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Special Tools



* EL-49741 - 9 V+ Power Source Harness



* EL-49742 - Battery Voltage B+ and Ground Source Harness



* J 35616 - GM-Approved Terminal Test Kit



Circuit/System Verification



Key ON, engine OFF. The TCCM runs a 2 second bulb test on all indicators of the TCSCS at key ON.



Circuit/System Testing



Note: When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 - GM



terminal test kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.



1. Remove key. Disconnect the X1 connector at the transfer case shift control switch (TCSCS).



2. Door open, key ON, engine OFF. Using the L-BU probe J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming



control circuit, TCSCS X1 pin 4 and a good ground, such as the ground terminal of the EL-49742 - harness, black terminal.



锟斤拷 If the voltage is less than the specified range, test the affected circuit for an open/high resistance, short to ground or short to voltage. If all



circuits and connections test normal, test the body control module (BCM) for proper operation.



3. Using the L-BU probes J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4



and the 2WD HI indicator control circuit, TSCSC X1 pin 8.



锟斤拷 If the voltage is less than the specified range, test the 2WD HI indicator control circuit for an open/high resistance or short to power. If all



circuits and connections test normal, test the TCCM for proper operation.



4. Key OFF. Using the L-BU probe J 35616-64B, test for greater than 10 ohm between the indicator dimming control circuit, TCSCS X1 pin 4



and all other pins of the TCSCS X1.



锟斤拷 If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test



normal, test the TCCM for proper operation.



5. Using the L-BU probe J 35616-64B, test for greater than 10 ohm between the 2WD HI indicator control circuit, TCSCS X1 pin 8 and all other



pins of the TCSCS X1.



锟斤拷 If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test



normal, test the TCCM for proper operation.



6. Test the TCSCS for proper operation.

Monday, May 27, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 379


DTC Descriptors



DTC B1395 03



- Device Voltage Reference Output 1 Circuit Voltage Below Threshold



DTC B1395 07



- Device Voltage Reference Output 1 Circuit Voltage Above Threshold



Diagnostic Fault Information



Circuit/System Description



Voltage for the interior backlighting components and stop lamp switch activation signal is supplied from the body control module (BCM). The BCM



applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is part of



the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior lamp



dimming switch through the I/P dimming control circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply voltage



circuit and they dim to the correct level.



The stop lamp switch is also supplied voltage on the same circuit for a stop lamp OFF signal to the BCM. When the stop lamp switch is activated the



voltage signal circuit to the BCM is opened prompting the BCM to illuminate the stop lamps.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* Ignition must be ON.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 533


Circuit/System Description



The heated seat temperature sensor is located in the seat back just under the seat cover with the seat heating element. The temperature sensor is a 2



wire thermistor and resistance through the sensor varies with temperature. The signal circuit is referenced from 5 V within the memory seat module



(MSM) and the temperature of the seat surface determines the signal circuit voltage. Once the seat reaches the set temperature, the module will then



cycle the control circuits of the heating elements ON and OFF in order to maintain the desired seat temperature based on the feedback voltage from



the sensors.



Conditions for Running the DTC



The heated seat system must be active.



Conditions for Setting the DTC



B2435 02 or B2440 02



The temperature sensor voltage drops below 0.8 volt for more than 1 second.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 111


If the test lamp is always OFF



11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.



11.2Test for less than 1 V between the control circuit and ground.



-If 1 V or greater, repair the short to voltage on the circuit.



鈬揑f less than 1 V



11.3Ignition OFF.



11.4Test for less than 2 锟?in the control circuit end to end.



-If 2 锟?or greater, repair the open/high resistance in the circuit.



-If less than 2 锟? replace the Assist Step Control Module.



-



If the test lamp is always ON



11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.



11.2Test for infinite resistance between the control circuit and ground.



-If less than infinite resistance, repair the short to ground on the circuit.



-If infinite resistance, replace the Assist Step Control Module.



锟?If the test lamp turns ON and OFF



12.Test or replace the appropriate assist step motor.



Repair Instructions



Perform the Diagnostic Repair Verification after completing the repair.



- Assist Step Motor Replacement



- Control Module References for Assist Step Control Module replacement, programming and setup.



B0052



DTC B0052 or B0053



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0052 00



- Deployment Commanded



Circuit/System Description



The inflatable restraint sensing and diagnostic module (SDM) contains a device that converts vehicle velocity changes into an electrical signal. The



SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional



signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the



SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0052 to set.



Conditions for Running the DTC



Ignition voltage is between 9-16 volts.



Conditions for Setting the DTC

Sunday, May 26, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 427


Circuit Description



When the power seat switches are pressed, they send a 12-volt signal through the switch signal circuits to the memory seat module (MSM). The



MSM then commands the driver seat motors to move in response to the switch signals.



Conditions for Running the DTC



The memory seat module must be powered.



Conditions for Setting the DTC



* If a seat switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.



* Multiple DTCs will set if one of the switch signal circuits is shorted to voltage.



Action Taken When the DTC Sets



* A motor output driven in response to a switch considered failed, is deactivated for both directions.



* All memory recall commands are ignored.



* The MSM will respond to any other switch signal that has not set a DTC.



Conditions for Clearing the DTC



* The current DTC will clear and set the code to history, 3 seconds after the fault is no longer present and the ignition is cycled OFF then back



to ACC or RUN.



* A history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.



Reference Information



Schematic Reference



Driver Seat Schematics ()



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Memory Seats Description and Operation ()



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 299


4. If the SDM impacts sensor and enabled deployment loops match the vehicle build and the DTC is still current, replace the K36 SDM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming



Vehicle Access



DTC B1019



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B1019 00



- System Configuration Error



Circuit/System Description



When calibrating the liftgate position, the liftgate module (LGM) is placed in a functional state to learn the liftgate travel limits. DTC B1019 00 will



set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the travel limits are learned by the LGM, the



liftgate module will exit calibration mode and DTC B1019 00 become a history code.



Conditions for Running the DTC



The system voltage is 9-16 volts.



Conditions for Setting the DTC



Whenever the LGM is replaced or in learn mode.



Action Taken When the DTC Sets



The power liftgate system will be disabled.



Conditions for Clearing the DTC



* The DTC will be current until the liftgate calibration procedure has been completed.



* When the calibration procedure has been completed the DTC will be a history DTC.



Diagnostic Aids



Setting B1019 00 is normal after flashing the liftgate module. This DTC will be current after flashing and the DTC will go to history after learning.



This is a normal behavior by design and is not necessary to replace the liftgate module.



Reference Information



Schematic Reference



Liftgate Schematics (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 401


Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition ON, verify DTC B1475 is set as current.



锟斤拷 If DTC B1475 is not set as current, operate the vehicle within the Conditions for Setting the DTC.



Note: When cycling the ignition, keep ignition OFF for 5 seconds before checking for current DTC.



2. Disconnect each of the following components one at a time. The components may be disconnected in any order. After each component is



disconnected, cycle the ignition and verify DTC B1475 remains set as current.



* Sunroof module (with RPO CF5)



* Mobile radio relay A (with RPO 9L4)



锟斤拷 If DTC B1475 does not remain set as current, test or replace the last component that was disconnected.



3. With all components disconnected, cycle the ignition and verify DTC B1475 is not set as current.



锟斤拷 If DTC B1475 remains set as current, test the accessory voltage circuit for a short to ground. If the circuit tests normal, replace the BCM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Instrument Panel Electrical Center or Junction Block Replacement - Left Side (See: Maintenance/Fuses and Circuit Breakers/Fuse



Block/Service and Repair/Removal and Replacement/Instrument Panel Electrical Center or Junction Block Replacement - Left Side)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming



B1516



DTC B1516



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B1516 08



- Battery Current Sensor Performance Signal Invalid



DTC B1516 66



- Battery Current Sensor Performance Wrong Mounting Position



Diagnostic Fault Information

Saturday, May 25, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 566


Circuit/System Description



The front seat heating elements are controlled by a common high current relay internal to the heated seat module (HSM) and on the low side by



individual element control circuits. The HSM connects the seat heater element supply voltage circuits to a common reference point. This reference



point is biased to approximately 2.5 V. Before the HSM will allow heated seat operation, it checks to see if the heating element supply voltage



circuits and control circuits are shorted to ground or battery voltage. Once the HSM verifies that it is not closing to a shorted heating element, it



allows heated seat operation. After which it continues to monitor for a shorted circuit.



Conditions for Running the DTC



The HSM must be powered.



Conditions for Setting the DTC



B2508 02



Before the heated seats are activated, the HSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.



B2508 01



Before the heated seats are activated, the HSM detects a short to battery voltage on the seat heating element supply voltage circuit or control circuit.



Action Taken When the DTC Sets



The heated seat function for both seats will be disabled.



Conditions for Clearing the DTC



* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.



* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 257


4. Using the L-BU probes J 35616-64B, connect a test light between the 5-volt reference circuit, TCSCS harness X1 pin 11 and a good ground.



The test light should illuminate dimly.



锟斤拷 If the test light does not illuminate, obtain a different test light and repeat step 4.



5. Key OFF. Wait 30 seconds for the TCCM to shut down.



Note: The TCCM must see the added resistance of the test light on the control circuit at key ON or the TCCM will shut the control circuit



drivers OFF. Volt meters will not work for this test.



6. Using the L-BU probes J 35616-64B, connect a test light between the TCSCS harness as specified below for the LED control circuit being



tested.



7. Key ON, engine OFF.



8. Using the Special Function ability of the scan tool, command the affected LED ON and OFF. The test light should turn OFF and ON as



commanded.



锟斤拷 If the test light remains illuminated when commanded OFF, test the affected control circuit for a short to ground. If all circuits and



connections test normal, replace the TCCM.



锟斤拷 If the test light remains OFF when commanded ON, test the affected control circuit for an open/high resistance or short to voltage. If all



circuits and connections test normal, replace the TCCM.



TCSCS



1. Using the L-BU probes J 35616-65B, connect the EL-49741 - 9 V+ power source harness to the TCSCS as specified below for the LED being



tested. Connecting the harness in the opposite pins will not illuminate the LED.



2. Connect a 9 V battery to the EL-49741 - harness.



3. Verify that only the indicator being tested illuminates.



锟斤拷 If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Transfer Case Shift Control Switch Replacement (Without SLT) (See: Powertrain Management/Transmission Control Systems/Sensors and



Switches - Transmission and Drivetrain/Sensors and Switches - Transfer Case/Four Wheel Drive Selector Switch/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming



* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related Diagnostic



Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)



B0780



DTC B0780



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0780 01



- 4WD LO Indicator Circuit Short to Battery

Friday, May 24, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 667


2. Ignition ON, test for 11.8-12.2 volts between the appropriate 12-volt reference circuit listed below and ground:



* X88/Z88 - terminal 11



* Z75 - terminal 5



锟斤拷 If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.



锟斤拷 If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,



replace the MSM.



3. Verify the scan tool Pedal Forward Switch parameter is Inactive.



锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* X88/Z88 - terminal 12



* Z75 - terminal 6



4. Verify the scan tool Pedal Aft Switch parameter is Inactive.



锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* X88/Z88 - terminal 10



* Z75 - terminal 4



5. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch



parameter should be Active.



* X88/Z88 - terminal 12



* Z75 - terminal 6



锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



6. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter



should be Active.



* X88/Z88 - terminal 10



* Z75 - terminal 4



锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



7. If all circuits test normal, test or replace the adjustable pedal switch.



Component Testing



X88/Z88



1. Ignition OFF, disconnect the harness connector at the adjustable pedal switch.



2. Test for infinite resistance between the 12-volt reference terminal 11 and the signal terminals listed below:



* Terminal 10



* Terminal 12



锟斤拷 If not the specified value, replace the adjustable pedal switch.



3. Adjustable pedal switch in the FWD position, test for less than 2 ohms between the 12-volt reference terminal 11 and the signal terminal 12.



锟斤拷 If greater than the specified range, replace the adjustable pedal switch.



4. Adjustable pedal switch in the RWD position, test for less than 2 ohms between the 12-volt reference terminal 11 and the signal terminal 10.



锟斤拷 If greater than the specified range, replace the adjustable pedal switch.



Z75



1. Ignition OFF, disconnect the harness connector at the adjustable pedal switch.



2. Test for infinite resistance between the 12-volt reference terminal 5 and the signal terminals listed below:

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 660


Replacement (Cadillac))Headlamp Switch Replacement (Except Cadillac) (See: Lighting and Horns/Headlamp/Headlamp Switch/Service



and Repair/Headlamp Switch Replacement (Except Cadillac))



* Control Module References (See: Testing and Inspection/Programming and Relearning) for XBCM replacement, setup, and programming



B3600



DTC B3600



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B3600 03



- Passenger Compartment Dimming Request Signal Circuit Voltage Below Threshold



DTC B3600 07



- Passenger Compartment Dimming Request Signal Circuit Voltage Above Threshold



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 146


8. If all circuits test normal, replace the appropriate sensor.



9. Reconnect all SIR components. Ignition ON, with a scan tool clear and check for DTCs.



锟斤拷 If the DTC returns and is current, replace the SDM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Inflatable Restraint Front End Sensor Replacement (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and



Repair/Inflatable Restraint Front End Sensor Replacement)



* Inflatable Restraint Side Impact Sensor Replacement (Front Side Door) (See: Restraints and Safety Systems/Air Bag Systems/Impact



Sensor/Service and Repair/Inflatable Restraint Side Impact Sensor Replacement (Front Side Door))Inflatable Restraint Side Impact Sensor



Replacement (Rear Side Door) (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and Repair/Inflatable Restraint



Side Impact Sensor Replacement (Rear Side Door))



* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming



B0087



DTC B0083-B0088



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0083 00



- Electronic Front End Sensor 1 No Additional Information (Left)



DTC B0083 0F



- Electronic Front End Sensor 1 Erratic (Left)



DTC B0083 39



- Electronic Front End Sensor 1 Internal Electronic Failure (Left)



DTC B0083 3A



- Electronic Front End Sensor 1 Incorrect Component Installed (Left)



DTC B0083 71



- Electronic Front End Sensor 1 Invalid Serial Data Received (Left)



DTC B0084 00



- Electronic Front End Sensor 2 No Additional Information (Right)



DTC B0084 0F



- Electronic Front End Sensor 2 Erratic (Right)



DTC B0084 39



- Electronic Front End Sensor 2 Internal Electronic Failure (Right)



DTC B0084 3A



- Electronic Front End Sensor 2 Incorrect Component Installed (Right)



DTC B0084 71



- Electronic Front End Sensor 2 Invalid Serial Data Received (Right)



DTC B0085 00



- LF Side Impact Sensor No Additional Information



DTC B0085 0F



- LF Side Impact Sensor Erratic

Thursday, May 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 26


Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Special Tools Required



J 38715-A Driver and Passenger SIR Load Tool



Circuit/System Verification



Note: Refer to SIR Service Precautions (See: Restraints and Safety Systems/Air Bag Systems/Service Precautions/Technician Safety Information)



Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of



the affected component/connector.



* Seat belt pretensioner



* Passenger instrument panel airbag



* Side air bag



* Roof rail airbag



* SDM



* SDM wiring harness connector



Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an



audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.



If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the



high resistance condition due to terminal fretting corrosion.



Observe the scan tool Deployment Loop Resistance parameters while moving the harness near each connector listed below. The reading should stay



consistently between 1.7 and 4.2 ohm without any drop outs or spikes.



* Passenger instrument panel air bag



* Roof rail air bag



* Seat side air bag



* Seat belt pretensioner



* Any inline harness



* SDM



If the reading is erratic while moving the harness, perform the following;



* Inspect each connector terminal for damage or corrosion and repair as necessary.



* Apply Nyogel lubricant 760G to each connector terminal.



* Insure each connector and CPA is correctly seated.



Circuit/System Testing



DTC B0014-B0018 or B0021-B0045



1. Ignition OFF, disconnect the scan tool and disconnect the harness connector at the appropriate air bag or seat belt retractor pretensioner.



2. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the air bag or seat belt retractor pretensioner.



3. Wait for 120 seconds and then test for greater than 25 ohm between the control circuit terminals listed below.



* Left roof rail air bag terminal 1 and 2



* Right roof rail air bag terminal 1 and 2



* Driver seat side air bag terminal 1 and 2



* Passenger seat side air bag terminal 1 and 2



* Driver seat belt retractor pretensioner terminal 1 and 2



* Passenger seat belt retractor pretensioner terminal 1 and 2



锟斤拷 If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars



are lifted. If the circuits and shorting bars tests normal, replace the SDM.



4. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:



* Roof rail air bag control circuit terminal 1



* Roof rail air bag control circuit terminal 2



* Seat side air bag control circuit terminal 1



* Seat side air bag control circuit terminal 2



* Retractor pretensioner control circuit terminal 1



* Retractor pretensioner control circuit terminal 2

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 621


DTC Descriptors



DTC B2880 01



- Tilt Position Sensor Circuit Short to Battery



DTC B2880 06



- Tilt Position Sensor Circuit Short to Ground or Open



DTC B2880 5A



- Tilt Position Sensor Circuit Plausibility Failure



DTC B2880 61



- Tilt Position Sensor Actuator Stuck



Diagnostic Fault Information



Circuit Description



The memory seat module (MSM) determines the position of the steering column based on inputs received from the tilt position sensors built into the



tilt actuators. The MSM supplies a 5-volt reference and a low reference to the sensors and monitors the column position via the steering column tilt



sensor signal circuit.



Conditions for Running the DTC



Ignition ON



Conditions for Setting the DTC



B2880 01



The steering column tilt sensor signal voltage is greater than 4.8 volts for more than 2 seconds.



B2880 06



The steering column tilt sensor signal voltage is less than 0.2 volt for more than 2 seconds.



B2880 5A



An incorrect steering column tilt sensor signal voltage is seen.



B2880 61



The steering column tilt sensor signal voltage does not change when the tilt actuator is commanded.



Action Taken When the DTC Sets



Steering column tilt operations are suspended.



Conditions for Clearing the DTC



* A current DTC will clear when the malfunction is no longer present



* A history DTC will clear after 50 malfunction-free ignition cycles.

Wednesday, May 22, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 127


Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using the diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0081 0F



- Passenger Presence System Erratic (sets in the SDM)



DTC B0081 3A



- Passenger Presence System Incorrect Component Installed (sets in the SDM)



DTC B0081 4B



- Passenger Presence System Calibration Not Learned (sets in the passenger presence (PPS) module)



DTC B0081 5A



- Passenger Presence System Plausibility Failure (sets in PPS module)



DTC B0081 39



- Passenger Presence System Internal Electronic Failure (sets in SDM)



DTC B0081 71



- Passenger Presence System Invalid Serial Data Received (sets in SDM)



Circuit/System Description



When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs



tests to diagnose critical malfunctions. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS



module. The SDM will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for



5 seconds. If the SDM determines the correct PPS is installed and functioning normally, the SDM will illuminate the passenger air bags ON or OFF



indicator based on messages from the PPS. The SDM sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF



indicator.



Conditions for Running the DTC



Ignition voltage is between 9-16 volts.



Conditions for Setting the DTC



All of the following conditions must exist for 5 seconds:



B0081 0F



The SDM sets this DTC if there is a fault present in the PPS module.



B0081 3A



The SDM sets this DTC when the SDM has received a message from the PPS which indicates a mismatch between the SDM and PPS module. There



is either an incorrect SDM or PPS module installed on this vehicle.



B0081 4B



The PPS module sets this DTC when the PPS module has not learned the calibrations.



B0081 5A



The PPS module sets this code when the PPS module has lost communications with the SDM.



B0081 39



The SDM sets this DTC when the SDM has received a critical fault message from the PPS module.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 126


Important:



* When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires



repair or replacement of the affected component/connector.



* PPS module



* SDM module



* PPS module harness connector



* SDM wiring harness connector



1. Ignition ON, verify that DTC B0081 is the only DTC set in the SDM or PPS module.



锟斤拷 If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code



Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).



2. Verify DTC B0081 0F, DTC B0081 3A, DTC B0081 39, or DTC B0081 71 is not set in the SDM. If any of these DTCs set in the SDM



diagnose the following:



* SDM DTC B0081 0F:



锟斤拷 If DTC B0081 0F sets in the SDM then the PPS module will set DTC B0081 4B or DTC B0081 5A. Refer to step #3 and diagnose the



PPS module DTC's. By diagnosing these two DTC's in the PPS module, DTC B0081 0F will be fixed in the SDM.



* SDM DTC B0081 3A:



锟斤拷 Either an incorrect replacement PPS module or SDM was placed in this vehicle. Check and make sure the part #'s are correct for each



module. If both part #'s are correct clear this DTC and see if DTC B0081 3A resets as a current DTC. If DTC B0081 3A resets then



replace the PPS module. Clear DTCs again and check if DTC B0081 3A sets as current again. If DTC B0081 3A sets again then



replace the SDM.



* SDM DTC B0081 39:



锟斤拷 If DTC B0081 39 sets in the SDM then replace the PPS module.



* SDM DTC B0081 71:



锟斤拷 If DTC B0081 71 sets in the SDM check and see if the SDM also sets DTC U0170. If DTC U0170 is set in the SDM then diagnose



DTC U0170. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic



Trouble Code (DTC) List - Vehicle). If DTC U0170 is not set in the SDM then check the connections at the SDM and PPS module.



Clear DTC's and check if DTC B0081 71 sets as current. If DTC B0081 71 sets as current again then replace the PPS module.



3. Verify DTC B0081 4B, or DTC B0081 5A is not set in the PPS module. If either of these DTCs set in the PPS module diagnose the following:



* PPS DTC B0081 4B:



锟斤拷 If DTC B0081 4B sets in the PPS module if the correct calibration was not learned by the PPS module. Perform the Passenger



Presence System Rezeroing procedure. Refer to Passenger Presence System Rezeroing (Tahoe Hybrid and Yukon Hybrid) (See:



Restraints and Safety Systems/Air Bag Systems/Testing and Inspection/Programming and Relearning/Passenger Presence System



Rezeroing (Tahoe Hybrid and Yukon Hybrid)).



* PPS DTC B0081 5A:



锟斤拷 If DTC DTC B0081 5A sets in the PPS module check the connections at the SDM and PPS module. Clear the DTC's and check if



DTC B0081 5A sets again in the PPS module. If DTC B0081 5A sets again replace the PPS module.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for PPS module and SDM replacement, setup, and



programming



Except Tahoe/Yukon Hybrid (No Denali)



DTC B0081 (Except Tahoe/Yukon Hybrid (No Denali))

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 265


Circuit/System Description



The 2WD HI indicator circuit consists of a light emitting diode (LED) feed circuit, a LED and a LED control circuit. The indicator dimming control



circuit is the LED feed circuit and continuously supplies B+ to the 2WD HI, 4WD Auto, 4WD HI and 4WD LO LEDs. When the 2WD HI mode has



been selected by the driver, the transfer case shift control module (TCCM) provides a ground through the 2WD HI indicator control circuit



illuminating the LED.



The TCCM tests the 2WD HI indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control



circuit by grounding the 2WD HI indicator control circuit for 2 seconds during the Bulb Test at key ON.



Conditions for Running the DTC



B0785 01



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the 2WD HI indicator is commanded ON.



B0785 06



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the 2WD HI indicator is commanded OFF.



Conditions for Setting the DTC



B0785 01



The TCCM detects 3.4 V or greater on the 2WD HI indicator control circuit when the 2WD HI indicator is commanded ON.



B0785 06



The TCCM detects 1.6 V or less for 1.5 seconds on the 2WD HI indicator control circuit when the 2WD HI indicator is commanded OFF.



Action Taken When the DTC Sets



Normal operation, the SERVICE 4WD indicator is not commanded ON. Driver is informed of fault via bulb inspection.



Conditions for Clearing the DTC



* The TCCM clears the DTC once the condition for setting the DTC is no longer present.



* A history DTC clears after 40 consecutive warm up cycles without a fault present.



* History DTCs can be cleared using a scan tool.



Diagnostic Aids



* A TRUE B+ has enough current to light a test light.



* A DIAGNOSTIC B+ is a low current circuit that DOES NOT have enough current to light a test light.



* A short to ground on the 2WD HI indicator control circuit will cause the 2WD HI indicator to remain ON at all times.



* An open or high resistance will cause the 2WD HI indicator to be inoperative during the 2 second bulb inspection.



* An open in the indicator dimming control circuit will cause the 2WD HI, 4WD Auto, 4WD HI and 4WD LO mode indicators to be inoperative



during the 2 second bulb inspection.



* EL-49741 - harness is a good source for 9 V.



* EL-49742 - harness is a good source for B+ and ground.



* With key REMOVED - opening a door puts a true B+ on the indicator dimming control circuit, TCSCS X1 pin 4. Other possible voltages are



listed below:



- Door open, key removed - indicator dimming control circuit voltage = true B+.



- Door open, key in, key OFF - indicator dimming control circuit voltage = true B+.



- Door open, key ON, engine OFF - indicator dimming control circuit voltage = diagnostic B+.

Tuesday, May 21, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 268


* Transfer Case Shift Control Switch Replacement (Without SLT) (See: Powertrain Management/Transmission Control Systems/Sensors and



Switches - Transmission and Drivetrain/Sensors and Switches - Transfer Case/Four Wheel Drive Selector Switch/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming



* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related Diagnostic



Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)



B0790



DTC B0790



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0790 01



- Neutral Indicator Circuit Short to Battery



DTC B0790 06



- Neutral Indicator Circuit Short to Ground or Open



Diagnostic Fault Information



Circuit/System Description



The Neutral indicator circuit consists of a light emitting diode (LED) feed circuit, a LED and a LED control circuit. The Ignition 1 voltage circuit is



the LED feed circuit and continuously supplies B+ to the Neutral LED. When the Neutral mode has been selected by the driver, the transfer case



shift control module (TCCM) provides a ground through the Neutral indicator control circuit illuminating the LED.



The TCCM tests the Neutral indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the Ignition 1 voltage circuit by



grounding the Neutral indicator control circuit for 2 seconds during the Bulb Test at key ON.



Conditions for Running the DTC



B0790 01



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the Neutral indicator is commanded ON.



B0790 06



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the Neutral indicator is commanded OFF.



Conditions for Setting the DTC



B0790 01



The TCCM detects 3.4 V or greater on the AWD/4WD Auto indicator control circuit when the Neutral indicator is commanded ON.



B0790 06



The TCCM detects 1.6 V or less for 1.5 seconds on the AWD/4WD Auto indicator control circuit when the Neutral indicator is commanded OFF.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 34


3. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground on the SDM side of the connector:



* Control circuit terminal 5 X1



* Control circuit terminal 6 X1



* Control circuit terminal 8 X1



* Control circuit terminal 7 X1



锟斤拷 If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the SDM.



4. Ignition OFF, test for greater than 25 ohm between the control circuit terminals listed below and ground on the SDM side of the connector:



* Control circuit terminal 5 X1



* Control circuit terminal 6 X1



* Control circuit terminal 7 X1



* Control circuit terminal 8 X1



锟斤拷 If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the SDM.



5. Install a 3 A fused jumper wire between the control circuit terminals listed below.



* Passenger instrument panel airbag stage 1 terminal 5 and 6 X1



* Passenger instrument panel airbag stage 2 terminal 8 and 7 X1



6. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohm.



锟斤拷 If greater than the specified range, test both control circuits terminals for an open/high resistance. If the circuits test normal, replace the



SDM.



7. Disconnect the passenger instrument panel air bag harness connector.



8. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the air bag.



9. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:



* Control circuit terminal A1



* Control circuit terminal A2



* Control circuit terminal B1



* Control circuit terminal B2



锟斤拷 If greater than the specified range, test the control circuit for a short to voltage.



10. Ignition OFF, test for greater than 25 ohm between the control circuit terminals listed below and ground:



* Control circuit terminal A1



* Control circuit terminal A2



* Control circuit terminal B1



* Control circuit terminal B2



锟斤拷 If less than the specified range, test the control circuit for a short to ground.



11. Ignition OFF, test for less than 5 ohm between the control circuit terminals listed below:



* X200 control circuit terminal A1 and passenger instrument panel air bag harness connector control circuit terminal A1



* X200 control circuit terminal A2 and passenger instrument panel air bag harness connector control circuit terminal A2



* X200 control circuit terminal B1 and passenger instrument panel air bag harness connector control circuit terminal B1



* X200 control circuit terminal B2 andpassenger instrument panel air bag harness connector control circuit terminal B2



锟斤拷 If greater than the specified range, test the control circuit for an open/high resistance.



12. If all circuits test normal, replace the passenger instrument panel air bag.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)



* Instrument Panel Inflatable Restraint Module Replacement (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and



Repair/Removal and Replacement/Instrument Panel Inflatable Restraint Module Replacement)



* Steering Wheel Inflatable Restraint Module Replacement (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and



Repair/Removal and Replacement/Steering Wheel Inflatable Restraint Module Replacement)

Monday, May 20, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 589


* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B2600 00



- Daytime Running Lamp Control Circuit



Diagnostic Fault Information



Circuit/System Description



The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2



and 4.9 V depending on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor.



The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either



daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM



will command the DRLs ON by applying ground to the DRL relay via the DRL relay control circuit. When the BCM applies ground to the DRL



relay control circuit, the DRL relay coil energizes causing the relay switch contacts to close. With the DRL relay energized, voltage is applied



through the relay switch contacts, the DRL Resistor, and the DRL fuse to the left and right low beam headlamp fuses illuminating the low beam



headlamps. Any function or condition that turns the headlamps ON will cancel DRL operation. Any function or condition that turns on the



headlamps will cancel DRL operation.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* Headlamp switch in AUTO position.



Conditions for Setting the DTC



The BCM detects a short to voltage in the DRL relay control circuit.



Action Taken When the DTC Sets



The BCM will disable the DRL relay control circuit.



Conditions for Clearing the DTC



* The condition responsible for setting the DTC no longer exists.



* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 9


Conditions for Clearing



* The DTC will transition to history when the fault is no longer present.



* A history DTC will clear after 100 malfunction-free ignition cycles.



Reference Information



Schematic Reference



Object Detection Schematics (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Diagrams/Electrical



Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Object Detection Description and Operation (UFT) (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist



Systems/Description and Operation/Object Detection Description and Operation (UFT))Object Detection Description and Operation (UVC) (See:



Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Description and Operation/Object Detection Description and



Operation (UVC))Object Detection Description and Operation (UD7) (See: Accessories and Optional Equipment/Collision Avoidance and Parking



Assist Systems/Description and Operation/Object Detection Description and Operation (UD7))



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the rearview camera.



2. Ignition ON, park brake applied, transmission in REVERSE, test for B+ between the B+ circuit terminal 3 and ground.



锟斤拷 If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.



3. If all circuits test normal, replace the BCM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, setup, and programming



B0012



DTC B0012 or B0013



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0012 01



- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Battery



DTC B0012 02



- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Short to Ground



DTC B0012 04



- Driver Steering Wheel Air Bag Deployment Loop Stage 1 Open Circuit

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 237


Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



1. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The



measured temperature should be within 5 degrees of parameter.



锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



2. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux.



Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.



锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct



Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.



锟斤拷 If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction.



Circuit/System Testing



Ambient / Inside Air Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1 ohm between the low reference circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate scan tool Temp Sensor parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Temp



Sensor parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Duct Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate Duct Temp Sensor Actual parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Duct



Temp Sensor Actual parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Component Testing



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table



for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.