Tuesday, July 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 213


B320A 39



If the DTC is current, the appropriate window motor must be replaced before the DTC can be cleared.



B320A 42



The affected power window motor must be programmed before the DTC can be cleared.



B320A 4B



The affected power window motor must be calibrated before the DTC can be cleared.



Reference Information



Schematic Reference



Moveable Window Schematics (See: Windows and Glass/Windows/Diagrams/Electrical Diagrams)



Connector End View Reference



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



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



B320A 39



Ignition ON, command the appropriate power window DOWN and UP with a scan tool. The power window should go DOWN and UP as



commanded.



If the DTC is current and the power window is inoperative, replace the power window motor.



If the DTC is history and the power window performs the UP and DOWN functions, clear the DTC.



B320A 42



Ignition ON, reprogram the appropriate power window and operate the power window within the conditions for running the DTC, verify the DTC



does not reset.



If the DTC resets, replace the power window motor.



B320A 4B



Command the front window motor fully DOWN by pressing and holding the front window switch for 5 seconds, then command the front window



motor fully UP by lifting and holding the front window switch for 5 seconds.



If the DTC resets, replace the power window motor.



Repair Instructions



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



Front Side Door Window Regulator Motor Replacement (See: Windows and Glass/Windows/Service and Repair/Front Side Door Window



Regulator Motor Replacement)

Monday, July 22, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 518


The module detects that the set point temperature has not been reached within 8.5 minutes.



B2425 0B, B2425 0E, B2430 0B, or B2430 0E



By measuring output current, the module calculates that the heating element resistance is below the minimum resistance.



B2425 0C, B2425 0D, B2430 0C, or B2430 0D



By measuring output current, the module calculates that the heating element resistance is above the maximum resistance.



B2425 1F or B2430 1F



The temperature sensor voltage is erratic or changes suddenly.



Action Taken When the DTC Sets



The heated seat cushion function for the affected seat 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.



Reference Information



Schematic Reference



Heated/Cooled Seat Schematics ()



Connector End View Reference



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



Description and Operation



Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()



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



Verify the type of vehicle and the heated seat system for which the DTC set.



If the DTC set in a vehicle equipped with memory, refer to Circuit/System Testing below.



If the DTC set in a hybrid vehicle without memory, refer to DTC B2425 or B2430 (HP2 w/o memory).



If the DTC set in a non-hybrid vehicle without memory, refer to DTC B2425 or B2430 (Dealer installed).



If the DTC set in the rear heated seat module, refer to DTC B2425 or B2430 (Rear seat).



Circuit/System Testing



B2425 0A, B2425 0B, B2425 0C, B2425 0D, B2425 0E, B2425 04, or B2425 1F



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



2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.



锟斤拷 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.



3. Ignition OFF, connect the X3 harness connector at the MSM and disconnect the X1 harness connector at the MSM.



Important: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat



unoccupied, then with the seat occupied.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 369


Circuit/System Description



The memory seat module (MSM) monitors the current supplied to the seat adjuster motors. The MSM can detect both absolute and differential



current levels from the motors. Absolute current is the maximum allowable current the module will supply to the motors. A differential current



mismatch occurs when the current supplied to the seat, lumbar and adjustable pedal motors do not match the current returning from the motors.



Conditions for Running the DTC



The MSM establishes that it is not closing to a shorted motor control circuit before the motors are active.



Conditions for Setting the DTC



B1335 00



Current out of the module does not match the current returning to the module within 5 amps.



B1335 0B



The absolute current or an over-current has exceeded the maximum value allowed.



B1335 42



This DTC will set if the module calibration is not programmed.



B1335 4B



This DTC will set if the module calibration is out of range.



Action Taken When the DTC Sets



The adjustable pedal motor and all driver seat adjuster motors are disabled.



Conditions for Clearing the DTC

Sunday, July 21, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 691


B3823 00



The BCM detects a fault in the right rear window down circuit.



Action Taken When the DTC Sets



The left or right rear power window will be inoperative from the driver master control.



Conditions for Clearing the DTC



* The DTC will be current for as long as the fault is present.



* When the fault is no longer present, the DTC will be a history DTC.



* A history DTC will clear after 50 ignition cycles.



Reference Information



Schematic Reference



Moveable Window Schematics (See: Windows and Glass/Windows/Diagrams/Electrical Diagrams)



Connector End View Reference



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



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 appropriate rear door window UP and DOWN by using the window switch on the driver master control. The rear door



window should perform UP and DOWN function.



Circuit/System Testing



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



2. Ignition ON, test for greater than 9 volts between the signal circuit terminal A and ground while commanding the rear window UP by using the



window switch on the driver master control.



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



BCM.



3. Test for greater than 9 volts between the signal circuit terminal C and ground while commanding the rear window DOWN by using the



window switch on the driver master control.



锟斤拷 If less than the specified range, test the signal 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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 303


HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Manual)



Connector End View Reference



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



Description and Operation



* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Manual/Air



Temperature Description and Operation)Air Temperature Description and Operation



* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Manual/Air Delivery



Description and Operation)Air Delivery 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



1. Ignition ON, disconnect the harness connector at the auxiliary HVAC control module, test for 4.8-5.2 volts between the 5-volt reference



circuit terminal 3 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 HVAC Control Module.



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 HVAC



Control Module.



2. Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.



锟斤拷 If the module will not reprogram, replace the HVAC control module that set the DTC.



3. With a scan tool, clear the DTC.



4. Ignition OFF.



5. Wait 60 seconds, then recheck for DTCs. DTC B1023 should not set.



锟斤拷 If DTC B1023 sets, replace the module.



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)Control Module References for control module



replacement, setup, and programming



B1024



DTC B1024



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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 290


DTC B1000 12



- Electronic Control Unit (ECU) Performance Below Minimum Threshold



DTC B1000 31



- Electronic Control Unit (ECU) General Checksum Problem



DTC B1000 32



- Electronic Control Unit (ECU) General Memory Failure



DTC B1000 33



- Electronic Control Unit (ECU) Performance Special Memory Failure



DTC B1000 34



- Electronic Control Unit (ECU) Performance RAM Integrity



DTC B1000 35



- Electronic Control Unit (ECU) Performance ROM Integrity



DTC B1000 36



- Electronic Control Unit (ECU) Performance EEPROM Integrity



DTC B1000 37



- Electronic Control Unit (ECU) Performance Watchdog / Safety Failure



DTC B1000 38



- Electronic Control Unit (ECU) Performance Supervision Software Failure



DTC B1000 39



- Electronic Control Unit (ECU) Performance Internal Electronic Failure



DTC B1000 43



- Electronic Control Unit (ECU) Performance EEPROM Error



DTC B1000 46



- Side Object Detection Performance - Invalid Configuration



DTC B1000 56



- Electronic Control Unit (ECU) Performance Allowable Number of Transitions / Events Exceeded



DTC B1000 57



- Electronic Control Unit (ECU) Performance



DTC B1000 73



- Electronic Control Unit (ECU) Performance Parity Error



DTC B1000 0F



- Electronic Control Unit (ECU) Performance Erratic



DTC B1000 2B



- Electronic Control Unit (ECU) Performance Missing Reference



DTC B1000 2C



- Electronic Control Unit Performance Reserved



DTC B1000 3B



- Electronic Control Unit (ECU) Performance Internal Self Test Failed



DTC B1000 3C



- Electronic Control Unit (ECU) Performance Internal Communications Failure



DTC B1000 4A



- Side Object Detection Performance - PROM Checksum Error



DTC B1000 F0



- Side Object Detection RF Transmit Chain Failed



DTC B1000 F1



- Side Object Detection RF Receive Chain Failed

Saturday, July 20, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 431


* Front vertical upward switch terminal A



* Front vertical downward switch terminal K



* Rear vertical upward switch terminal F



* Rear vertical downward switch terminal J



* Horizontal forward switch terminal D



* Horizontal rearward switch terminal C



* Recline forward switch terminal H



* Recline rearward switch terminal G



3. If all circuits test normal, test or replace the seat adjuster switch.



Component Testing



1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.



2. Test for infinite resistance between each seat direction signal terminal listed below and the B+ terminal E with the switch in the open position.



* Front vertical upward switch terminal A



* Front vertical downward switch terminal K



* Rear vertical upward switch terminal F



* Rear vertical downward switch terminal J



* Horizontal forward switch terminal D



* Horizontal rearward switch terminal C



* Recline forward switch terminal H



* Recline rearward switch terminal G



锟斤拷 If not the specified value, replace the seat adjuster switch.



3. Test for less than 1 ohm between each seat direction signal terminal listed below and the B+ terminal E with the switch in the closed position.



* Front vertical upward switch terminal A



* Front vertical downward switch terminal K



* Rear vertical upward switch terminal F



* Rear vertical downward switch terminal J



* Horizontal forward switch terminal D



* Horizontal rearward switch terminal C



* Recline forward switch terminal H



* Recline rearward switch terminal G



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



Repair Instructions



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



* Power Seat Switch Replacement (with HP2) ()Power Seat Switch Replacement (without HP2) ()



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



B1750



DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820



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 B1735 01



- Seat Front Up Switch Circuit Short to Battery



DTC B1740 01



- Seat Front Down Switch Circuit Short to Battery

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 51


B0014 02, B0015 02, B0016 02, B0019 02, B0020 02, B0021 02, B0022 02, B0023 02



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



B0014 04, B0015 04, B0016 04, B0019 04, B0020 04, B0021 04, B0022 04, B0023 04



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



B0014 0D, B0015 0D, B0016 0D, B0019 0D, B0020 0D, B0021 0D, B0022 0D, B0023 0D



The air bag or seat belt retractor pretensioner deployment loop resistance is greater than 3.9 ohms for 120 milliseconds.



B0014 0E, B0015 0E, B0016 0E, B0019 0E, B0020 0E, B0021 0E, B0022 0E, B0023 0E



The air bag or seat belt retractor pretensioner deployment loop resistance is less than 1.1 ohm for 120 milliseconds.



Action Taken When the DTC Sets



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



* The SDM will store a DTC, however if an event occurs the system will still attempt deployments.



Conditions for Clearing the DTC



* The condition for setting the DTC no longer exists.



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



Diagnostic Aids



* When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This



should be taken into account when testing for faults on these circuits.



* This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.



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



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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 699


Circuit/System Description



The windshield washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the



switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil



side of the WSH Relay energizing the relay. With the relay energized, battery voltage from the WPR fuse is applied through the switch contacts of



the relay, the WSW/PUMP Fuse, and the control circuit to the windshield washer fluid pump.



Conditions for Running the DTC



This DTC can set only when the output is actively being requested by the BCM.



Conditions for Setting the DTC



This DTC sets if the BCM detects a short to voltage in the windshield washer pump 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



Operate the washers using the WASH switch. Verify the washer pump activates.



Circuit/System Testing



1. Ignition OFF, disconnect the X4 harness connector at the BCM.



2. Ignition ON, verify the windshield washer pump is not on.



锟斤拷 If the windshield washer pump is on, test the windshield washer pump relay control circuit terminal 15 for a short to ground. If the circuit



tests normal replace the underhood fuse block.



3. Install a 10A fused jumper wire between the relay control circuit terminal 15 and ground. Verify the windshield washer pump is on.



锟斤拷 If the windshield washer pump is not on, test the relay control circuit for a short to voltage or an open/high resistance. If the circuit tests



normal replace the underhood fuse block.



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

Friday, July 19, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 347


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



radio.



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.



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



DTC Set By Radio UQA with U42



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



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.



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.



3. Ignition OFF, reconnect the X3 harness connector at the amplifier.



4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.



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



* Left rear low level audio signal (+) - terminal 1

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 579


DTC Descriptors



DTC B2555 01



- Passenger Compartment Lamp Control Circuit Short to Battery



DTC B2555 02



- Passenger Compartment Lamp Control Circuit Short to Ground



Diagnostic Fault Information



Circuit/System Description



When the body control module (BCM) signals for courtesy lamp operation, a message is sent over the serial data circuit to the driver door and



passenger door switches. The driver door switch and passenger door switch the applies battery voltage to the left and right courtesy lamp control



circuits illuminating the door courtesy lamps. The driver door and passenger door switches also provide ground to the lamps.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* A message is sent from the BCM over the serial data circuit to the driver door and passenger door switches to active the door courtesy lamps.



Conditions for Setting the DTC



B2555 01



The driver or passenger door switch detects a short to voltage in the courtesy lamp control circuit.



B2555 02



The driver or passenger door switch detects a short to ground in the courtesy lamp control circuit.



Conditions for Clearing the DTC



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



* A scan tool CLEAR DTCs command is issued for that switch module.



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



Reference Information



Schematic Reference



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

Thursday, July 18, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 261


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)



MP 3010-NP0 - Transfer Case



DTC B0785



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 B0785 01



- 2 High Indicator Circuit Short to Battery



DTC B0785 06



- 2 High Indicator Circuit Short to Ground or Open



Diagnostic Fault Information



Circuit/System Description



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



circuit is the LED feed circuit and continuously supplies voltage to the 2 High, Auto 4WD, and 4 High LEDs. When the 2 High mode has been



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



LED. The TCCM tests the 2 High indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming



control circuit by grounding the 2 High 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 2 High 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 2 High indicator is commanded OFF.



Conditions for Setting the DTC

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 317


* Left front speaker output (-) - terminal 3 X2



* Right front speaker output (+) - terminal 2 X2



* Right front low speaker output (-) - terminal 1 X2



* Left rear speaker output (+) - terminal 8 X2



* Left rear speaker output (-) - terminal 7 X2



* Right rear speaker output (+) - terminal 6 X2



* Right rear speaker output (-) - terminal 5 X2



* Left or rear subwoofer speaker output (+) - terminal 7 X1



* Left or rear subwoofer speaker output (-) - terminal 3 X1



* Right subwoofer speaker output (+) - terminal 6 X1



* Right subwoofer speaker output (-) - terminal 2 X1



锟斤拷 If less than the specified value, test both circuits of the affected speaker for a short to ground.



4. If all circuits test normal, reconnect all harness connectors at the amplifier.



5. Ignition ON, radio ON, disconnect the appropriate speaker.



6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.



锟斤拷 If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.



锟斤拷 If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.



7. If the circuit tests normal, replace the appropriate speaker.



DTC Set by Audio Amplifier UQA with Y91 or UQS



1. Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.



2. Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2



* Left or rear subwoofer speaker output (+) - terminal 1 X1



* Left or rear subwoofer speaker output (-) - terminal 2 X1



* Right subwoofer speaker output (+) - terminal 7 X1



* Right subwoofer speaker output (-) - terminal 3 X1



锟斤拷 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.



3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2



* Left or rear subwoofer speaker output (+) - terminal 1 X1



* Left or rear subwoofer speaker output (-) - terminal 2 X1



* Right subwoofer speaker output (+) - terminal 7 X1



* Right subwoofer speaker output (-) - terminal 3 X1



锟斤拷 If less than the specified value, test both circuits of the affected speaker for a short to ground.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 582


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 low beam headlamp relay.



2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.



锟斤拷 If the test lamp illuminates, test the control circuit for a short to voltage.



3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.



锟斤拷 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the



B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the low beam



headlamp relay.



4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.



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



5. Disconnect the harness connector at the appropriate head lamp.



6. Test for less than 5 ohm between the head lamp ground circuit terminal listed below and ground:



* With X88 - Terminal A



* With Z88 - Terminal B



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



7. Connect the harness connector at the headlamp.



8. Connect a 20 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp is activated.



锟斤拷 If the headlamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal,



test or replace the headlamp.



锟斤拷 If the headlamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or



replace the headlamp.



9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.



10. Command the Low 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 an open/high resistance. If the circuit tests normal, replace



the BCM.



11. If all circuits test normal, test or replace the low beam headlamp relay.



Repair Instructions



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



* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay



Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power



Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))



* Headlamp Replacement (Cadillac Escalade) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp



Replacement (Cadillac Escalade))Headlamp Replacement (GMC Yukon Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service



and Repair/Removal and Replacement/Headlamp Replacement (GMC Yukon Two-mode Hybrid))Headlamp Replacement (Yukon) (See:



Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Yukon))Headlamp Replacement



(Chevrolet Tahoe Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp



Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Headlamp/Service



and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement (Escalade PLATINUM) (See:



Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Escalade Platinum))Headlamp



Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Non



HID))



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

Wednesday, July 17, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 683


B3819



DTC B3819, B3820, B3822, or B3823



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 B3819 00



- Left Rear Window Up Control Circuit



DTC B3820 00



- Left Rear Window Down Control Circuit



DTC B3822 00



- Right Rear Window Up Control Circuit



DTC B3823 00



- Right Rear Window Down Control Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or



DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the



up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is



commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the



UP or DOWN direction.



Conditions for Running the DTC

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 447


Diagnostic Aids



* All position sensors use common ground and 5-volt reference circuits.



* If the 5-volt reference circuit is shorted to voltage, multiple codes will set.



* If the 5-volt reference circuit is shorted to ground, multiple codes will set.



* If the sensor ground circuit is open, multiple codes will set.



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)



Scan Tool Reference



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



Circuit/System Verification



Ignition ON, observe the scan tool Driver Position Module driver seat and lumbar position sensor parameters. The readings should be between



0.22-2.75 volts and change while adjusting seat and lumbar positions.



Circuit/System Testing



B1825 01 or B1825 06



1. Ignition OFF, disconnect the harness connector at the seat recline position sensor.



2. Test for less than 2 ohms between the low reference circuit terminal 1 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 MSM.



3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 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 scan tool Driver Seat Recline Sensor parameter is less than 1 volt.



锟斤拷 If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.



5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 3. Verify the scan tool Driver Seat



Recline Sensor parameter is greater than 4.75 volts.



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 recline position sensor.



B2355 01, B2355 06, B2365 01, B2365 06, B2375 01 or B2375 06



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



2. Test for less than 2 ohms 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 MSM.

Tuesday, July 16, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 573


锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Left rear seat cushion terminal 3



* Left rear seat cushion terminal 5



3. Test for infinite resistance between the control circuit terminal 6 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Right rear seat cushion terminal 6



* Right rear seat cushion terminal 2



4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:



* Left rear seat cushion terminal 3



* Left rear seat cushion terminal 5



5. Verify that a test lamp does not illuminate between the control circuit terminal 6 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:



* Right rear seat cushion terminal 6



* Right rear seat cushion terminal 2



6. If all circuits test normal, replace the RHSM.



Repair Instructions



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



* Rear Seat Cushion Heater Replacement ()



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



B2530



DTC B2530



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 B2530 00



- Front Fog Lamps Control Circuit



Diagnostic Fault Information



Circuit/System Description

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 143


DTC B0086 0F



- RF Side Impact Sensor Erratic



DTC B0086 39



- RF Side Impact Sensor Internal Electronic Failure



DTC B0086 3A



- RF Side Impact Sensor Incorrect Component Installed



DTC B0086 71



- RF Side Impact Sensor Invalid Serial Data Received



DTC B0087 00



- LR Side Impact Sensor No Additional Information



DTC B0087 0F



- LR Side Impact Sensor Erratic



DTC B0087 39



- LR Side Impact Sensor Internal Electronic Failure



DTC B0087 3A



- LR Side Impact Sensor Incorrect Component Installed



DTC B0087 71



- LR Side Impact Sensor Invalid Serial Data Received



DTC B0088 00



- RR Side Impact Sensor No Additional Information



DTC B0088 0F



- RR Side Impact Sensor Erratic



DTC B0088 39



- RR Side Impact Sensor Internal Electronic Failure



DTC B0088 3A



- RR Side Impact Sensor Incorrect Component Installed



DTC B0088 71



- RR Side Impact Sensor Invalid Serial Data Received



Diagnostic Fault Information



Circuit/System Description



The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID,



state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and



a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by



performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds.



The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit.



When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present,

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 37


DTC B0022 01



- RF Pretensioner Deployment Loop Short to Battery



DTC B0022 02



- Passenger Seat Belt Retractor Pretensioner Deployment Loop Short to Ground



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.

Monday, July 15, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 633


Verify DTC B3109, B3110, B3111, or B3112 are not set.



If any of the DTCs are set, replace the battery in the appropriate keyless entry transmitter. Operate the transmitter 3 consecutive times. If the DTC



resets, replace the keyless entry transmitter.



Repair Instructions



Important: This vehicle may be equipped with the 2-Way Advanced Remote Start System. Vehicle equipped with the 2-Way Advanced



Remote Start System can be identified by an LCD screen on the keyless entry transmitter or a yellow label on the RCDLR. When servicing



the 2-Way Advanced Remote Start System, ensure that the correct parts are installed during replacement. Service parts for the 2-Way



Advanced Remote Start System can be found in the Accessory section of the parts manual.



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



Remote Control Door Lock Transmitter Programming (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless



Entry/Keyless Entry Transmitter/Testing and Inspection)



B3110



DTC B3109, B3110, B3111, or B3112



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 B3109 00



- Keyless Entry Transmitter 1 Low Battery



DTC B3110 00



- Keyless Entry Transmitter 2 Low Battery



DTC B3111 00



- Keyless Entry Transmitter 3 Low Battery



DTC B3112 00



- Keyless Entry Transmitter 4 Low Battery



Circuit/System Description



With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote control



door lock receiver (RCDLR) along with the commanded keyless entry function.



Conditions for Running the DTC



A keyless transmitter button is pressed.



Conditions for Setting the DTC



The DTC sets after 3 consecutive low battery signals from the same programmed transmitter.



Action Taken When the DTC Sets



The keyless entry system is inoperative.



Conditions for Clearing the DTC



The DTC is cleared when a normal transmitter voltage signal is received from the programmed transmitter that set the DTC.



Diagnostic Aids



The keyless entry transmitter used in the 2-Way Advanced Remote Start System is unique to the system. When servicing or replacing a transmitter,



ensure that the correct transmitter is used. The correct transmitter part number can be found in the Accessory section of the parts catalog. Attempting

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 417


Outside Rearview Mirror Schematics (See: Body and Frame/Mirrors/Diagrams/Electrical Diagrams/Outside Rearview Mirror Schematics)



Connector End View Reference



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



Description and Operation



Outside Mirror Description and Operation (Heated Mirrors) (See: Body and Frame/Mirrors/Description and Operation/Outside Mirror Description



and Operation (Heated Mirrors))Outside Mirror Description and Operation (Power Mirrors) (See: Body and Frame/Mirrors/Description and



Operation/Outside Mirror Description and Operation (Power Mirrors))



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 References



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



Circuit/System Verification



Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the



commanded direction.



Circuit/System Testing



1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.



2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:



* Control circuit terminal 1



* Control circuit terminal 2



* Control circuit terminal 6



锟斤拷 If the test lamp illuminates, test the appropriate control circuit for a short to voltage.



3. Ignition OFF, test for infinite resistance between the following control circuits and ground:



* Control circuit terminal 1



* Control circuit terminal 2



* Control circuit terminal 6



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



4. Test for 40-100 ohms between the control circuit terminal 1 and the control circuit terminal 6.



锟斤拷 If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the



rearview mirror.



5. Test for 40-100 ohms between the control circuit terminal 2 and the control circuit terminal 6.



锟斤拷 If not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the rearview



mirror.



6. If all circuits test normal, replace the door module.



Repair Instructions



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



* Outside Rearview Mirror Motor Replacement (See: Body and Frame/Mirrors/Power Mirror Motor/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for DDM or PDM replacement, setup, and

Sunday, July 14, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 21


1. Ignition OFF, disconnect the scan tool and disconnect harness connector X200.



2. Wait for 120 seconds and then test for greater than 25 ohm between the appropriate control circuit terminals listed below on the SDM side of



the connector:



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



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



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.



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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 531


Reference Information



Schematic Reference



Heated/Cooled Seat Schematics ()



Connector End View Reference



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



Description and Operation



Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()



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



Verify the type of vehicle and the heated seat system for which the DTC set.



If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.



If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).



Circuit/System Testing



B2435 02 or B2435 05



1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.



2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.



锟斤拷 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat



back heater element/temperature sensor.



锟斤拷 If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits



test normal, replace the seat back heater element/temperature sensor.



3. Connect the X2, X4 harness connectors at the HSM.



4. Disconnect the harness connector at the seat back heater element/temperature sensor.



5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.



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



HSM.



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 HSM.



6. If all circuits test normal, replace the HSM.



B2440 02 or B2440 05



1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.



2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.



锟斤拷 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat



back heater element/temperature sensor.



锟斤拷 If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits



test normal, replace the seat back heater element/temperature sensor.



3. Connect the X2, X4 harness connectors at the HSM.



4. Disconnect the harness connector at the seat back heater element/temperature sensor.



5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C 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 HSM.



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 426


* Front vertical upward switch terminal A



* Front vertical downward switch terminal K



* Rear vertical upward switch terminal F



* Rear vertical downward switch terminal J



* Horizontal forward switch terminal D



* Horizontal rearward switch terminal C



* Recline forward switch terminal H



* Recline rearward switch terminal G



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



Repair Instructions



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



* Power Seat Switch Replacement (with HP2) ()Power Seat Switch Replacement (without HP2) ()



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



B1740



DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820



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 B1735 01



- Seat Front Up Switch Circuit Short to Battery



DTC B1740 01



- Seat Front Down Switch Circuit Short to Battery



DTC B1745 01



- Seat Rear Up Switch Circuit Short to Battery



DTC B1750 01



- Seat Rear Down Switch Circuit Short to Battery



DTC B1755 01



- Seat Assembly Forward Switch Circuit Short to Battery



DTC B1760 01



- Seat Assembly Rearward Switch Circuit Short to Battery



DTC B1815 01



- Seat Recline Forward Switch Circuit Short to Battery



DTC B1820 01



- Seat Recline Rearward Switch Circuit Short to Battery



Diagnostic Fault Information

Saturday, July 13, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 690


DTC B3819 00



- Left Rear Window Up Control Circuit



DTC B3820 00



- Left Rear Window Down Control Circuit



DTC B3822 00



- Right Rear Window Up Control Circuit



DTC B3823 00



- Right Rear Window Down Control Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or



DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the



up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is



commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the



UP or DOWN direction.



Conditions for Running the DTC



Battery voltage is between 9-16 volts.



Conditions for Setting the DTC



B3819 00



The BCM detects a fault in the left rear window up circuit.



B3820 00



The BCM detects a fault in the left rear window down circuit.



B3822 00



The BCM detects a fault in the right rear window up circuit.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 524


DTC B2425 1F



- Left Seat Heater Cushion Circuit Intermittent



DTC B2430 04



- Right Seat Heater Cushion Circuit Open



DTC B2430 0A



- Right Seat Heater Cushion Circuit Rate of Change Below Threshold



DTC B2430 0B



- Right Seat Heater Cushion Circuit Current Above Threshold



DTC B2430 0C



- Right Seat Heater Cushion Circuit Current Below Threshold



DTC B2430 0D



- Right Seat Heater Cushion Circuit Resistance Above Threshold



DTC B2430 0E



- Right Seat Heater Cushion Circuit Resistance Below Threshold



DTC B2430 1F



- Right Seat Heater Cushion Circuit Intermittent



Diagnostic Fault Information



Circuit/System Description



When the heated seat function is active, the rear heated seat module (RHSM) supplies battery voltage through the element supply voltage circuit to



the seat heater elements. The RHSM controls the seat temperature by providing a pulse width modulated (PWM) ground through the heated seat



element control circuit to the seat heater elements. The RHSM then monitors the current flow through the heating element and the temperature sensor



rate of change to verify correct operation.



Conditions for Running the DTC



The RHSM must be powered and the heated seat must be enabled.



Conditions for Setting the DTC



B2425 04 or B2430 04



The RHSM does not detect a temperature change within 210 seconds.



B2425 0A or B2430 0A



The RHSM detects that the set point temperature has not been reached within 8.5 minutes.



B2425 0B, B2425 0E, B2430 0B, or B2430 0E

Friday, July 12, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 183


* Lower Auxiliary Air Temperature Sensor



* Auxiliary Inside Air Temperature Sensor



A signal and low reference circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance



decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40 to +101锟斤拷C



(-40 to +215锟斤拷F). The sensor signal varies between 0-5 volts. The HVAC control module converts the signal to a range between 0-255 counts. As the



air temperature increases the count value will decrease. If the HVAC control module or auxiliary HVAC control module detects a malfunctioning



sensor, then the control module software will use a defaulted air temperature value. The default value for the ambient and inside air temperature



sensors will be displayed on the scan tool. The default value for the duct air temperature sensors will not be displayed on the scan tool. The scan tool



parameter for the duct air temperature sensors are the actual state of the signal circuit. The default action ensures that the HVAC system can adjust



the inside air temperature near the desired temperature until the condition is corrected.



Diagnostic Aids



Conditions for Running the DTC



Ignition ON.



Conditions for Setting the DTC



The HVAC control module detects the temperature sensor signal circuit is less than -36锟斤拷C (-38锟斤拷F) or greater than 215锟斤拷C (419锟斤拷F) for greater than 15



seconds.



Action Taken When the DTC Sets



The system operates using a default value.



Conditions for Clearing the DTC



* The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.



* The history DTC will clear after 100 fault-free ignition cycles.



Reference Information



Schematic Reference



HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic)



Connector End View Reference



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



Description and Operation



* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air



Temperature Description and Operation)



* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery



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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 564


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.



Reference Information



Schematic Reference



Heated/Cooled Seat Schematics ()



Connector End View Reference



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



Description and Operation



Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()



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



Verify the type of vehicle and the heated seat system for which the DTC set.



If the DTC set in the rear heated seat module, refer to Circuit/System Testing below.



If the DTC set in a vehicle equipped with memory, refer to DTC B2508 or B2509 (w/o HP2 with memory).



If the DTC set in a hybrid vehicle without memory, refer to DTC B2508 or B2509 (HP2 w/o memory).



If the DTC set in a non-hybrid vehicle without memory, refer to DTC B2508 or B2509 (Dealer installed).



Circuit/System Testing



1. Ignition OFF, disconnect the X1 harness connector at the RHSM.



2. Test for infinite resistance between the control circuit terminal 3 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Left rear seat cushion terminal 3



* Left rear seat cushion terminal 5



3. Test for infinite resistance between the control circuit terminal 6 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Right rear seat cushion terminal 6



* Right rear seat cushion terminal 2



4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:



* Left rear seat cushion terminal 3



* Left rear seat cushion terminal 5



5. Verify that a test lamp does not illuminate between the control circuit terminal 6 and ground.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 604


DTC B2725 08



- Active Transfer Case Mode Switch Circuit - Signal Invalid



Diagnostic Fault Information



Circuit/System Description



The transfer case shift control switch (TCSCS) has 3 modes. The transfer case shift control module (TCCM) supplies a regulated 5 V DC to the



switch through the 5-volt reference circuit. The current travels through the specific resistor of the currently selected mode, each mode has its own



resistor. The current is then returned to the TCCM through the switch signal circuit.



The TCCM continuously monitors the switch signal circuit to determine whether a mode change has been requested by the driver.



The NP0 transfer case has the following 3 modes:



* 2 Hi



* 4WD Auto



* 4 Hi



Conditions for Running the DTC



* Ignition ON.



* System voltage 10.5-18 V.



Conditions for Setting the DTC



* The system constantly monitors the voltage on switch signal circuit.



* If the system detects a voltage level under 0.38 volts or greater than 4.86 volts for 60 seconds, the DTC is logged.



Action Taken When the DTC Sets



* All shifting is disabled.



* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.



* Failure Records will be stored.



Conditions for Clearing the DTC



* The TCCM will clear the current DTC once the conditions for setting the DTC are 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



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



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)

Thursday, July 11, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 71


Diagnostic Aids



* When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This



should be taken into account when testing for faults on these circuits.



* This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.



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



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.