Tuesday, April 30, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 445


* 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



B1825



DTC B1825, B1850, B1860, B2355, B2365, or B2375



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 B1825 01



- Seat Recline Position Sensor Circuit Short to Battery



DTC B1825 06



- Seat Recline Position Sensor Circuit Short to Ground or Open



DTC B1825 5A



- Seat Recline Position Sensor Circuit Plausibility Failure



DTC B1850 01



- Left Seat Lumbar Horizontal Position Sensor Circuit Short to Battery



DTC B1850 06



- Left Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open



DTC B1850 5A



- Left Seat Lumbar Horizontal Position Sensor Circuit Plausibility Failure



DTC B1860 01



- Left Seat Lumbar Vertical Position Sensor Circuit Short to Battery



DTC B1860 06



- Left Seat Lumbar Vertical Position Sensor Circuit Short to Ground or Open



DTC B1860 5A



- Left Seat Lumbar Vertical Position Sensor Circuit Plausibility Failure



DTC B2355 01



- Left Seat Front Vertical Position Sensor Circuit Short to Battery



DTC B2355 06



- Left Seat Front Vertical Position Sensor Circuit Short to Ground or Open



DTC B2355 5A



- Left Seat Front Vertical Position Sensor Circuit Plausibility Failure



DTC B2365 01



- Left Seat Rear Vertical Position Sensor Circuit Short to Battery



DTC B2365 06



- Left Seat Rear Vertical Position Sensor Circuit Short to Ground or Open



DTC B2365 5A



- Left Seat Rear Vertical Position Sensor Circuit Plausibility Failure



DTC B2375 01



- Left Seat Assembly Horizontal Position Sensor Circuit Short to Battery



DTC B2375 06



- Left Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 493


* Left rear seat terminal 9 X4 and terminal 6 X2



* Right rear seat terminal 20 X4 and terminal 8 X2



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



appropriate seat cushion heater element/temperature sensor.



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



B2345 42 or B2345 4B



If either DTC is set, 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



B2355



DTC B1825, B1850, B1860, B2355, B2365, or B2375



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 B1825 01



- Seat Recline Position Sensor Circuit Short to Battery



DTC B1825 06



- Seat Recline Position Sensor Circuit Short to Ground or Open



DTC B1825 5A



- Seat Recline Position Sensor Circuit Plausibility Failure



DTC B1850 01



- Left Seat Lumbar Horizontal Position Sensor Circuit Short to Battery



DTC B1850 06



- Left Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open



DTC B1850 5A



- Left Seat Lumbar Horizontal Position Sensor Circuit Plausibility Failure



DTC B1860 01



- Left Seat Lumbar Vertical Position Sensor Circuit Short to Battery



DTC B1860 06



- Left Seat Lumbar Vertical Position Sensor Circuit Short to Ground or Open



DTC B1860 5A



- Left Seat Lumbar Vertical Position Sensor Circuit Plausibility Failure



DTC B2355 01



- Left Seat Front Vertical Position Sensor Circuit Short to Battery



DTC B2355 06



- Left Seat Front Vertical Position Sensor Circuit Short to Ground or Open



DTC B2355 5A



- Left Seat Front Vertical Position Sensor Circuit Plausibility Failure

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 350


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.



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



5. 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.



Repair Instructions



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



* Speaker Replacement Reference (See: Accessories and Optional Equipment/Testing and Inspection/Symptom Related Diagnostic



Procedures/Cellular, Entertainment, and Navigation/Speaker Replacement Reference)



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

Monday, April 29, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 503


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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 601


headlamp and panel dimmer switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the



headlamp and panel dimmer switch through the instrument panel (I/P) lamp dimming switch signal circuit to the BCM. The BCM then applies the



dimmed voltage to the I/P lamp dimming control circuit and the components on the circuit.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* The ignition must be ON.



Conditions for Setting the DTC



The BCM receives an open, voltage, or ground signal on the I/P lamp dimming control circuit.



Action Taken When the DTC Sets



The I/P lamps are not illuminated.



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



)



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



Note: Each back lighted component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify



the following:



* Back lighted components the vehicle is equipped with.



* Component locations on the back lighting dimming control circuit



* Each component's control and ground circuit terminals



1. Ignition OFF, disconnect the harness connector at any component with inoperative backlighting.



2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohm between the ground circuit and ground.



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



3. Connect a test lamp between the control circuit and ground.



4. Command the Incandescent Dimming Control 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 OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

Sunday, April 28, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 513


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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 496


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.



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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 631


Connector End View Reference



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



Description and Operation



Keyless Entry System Description and Operation (Without Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)



)Keyless Entry System Description and Operation (With Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (With Accessory 2 Way Remote))



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



J 43241 Keyless Entry Tester



Circuit/System Verification



Attempt to program the keyless entry transmitter, refer to Remote Control Door Lock Transmitter Programming (See: Accessories and Optional



Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry Transmitter/Testing and Inspection). The transmitter should program.



Circuit/System Testing



1. Verify that the transmitter is the correct transmitter for the vehicle.



锟斤拷 If not correct, replace the transmitter.



2. Place the transmitter on the test pad of the J 43241 and press each button of the transmitter one at a time. The tester should sound a tone and



illuminate a green light when each button is pressed.



锟斤拷 If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241. If



the condition continues after battery replacement, replace the transmitter.



3. Attempt to program the transmitter, refer to Remote Control Door Lock Transmitter Programming (See: Accessories and Optional



Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry Transmitter/Testing and Inspection). The transmitter should program.



锟斤拷 If the transmitter does not program, test the keyless entry antenna for an open/high resistance. If the circuit tests normal, replace the



RCDLR.



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 RCDLR replacement, setup, and programming



B3109



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.

Saturday, April 27, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 93


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.



B051B



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 342


* Right rear low level audio signal (-) - terminal 4 X4



* Subwoofer low level audio signal (+) - terminal 5 X4



* Subwoofer low level audio signal (-) - terminal 6 X4



* Center Channel low level audio signal (+) - terminal 13 X4



* Center Channel low level audio signal (-) - terminal 14 X4



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 Y91 and U42 or UQS and U42



1. Ignition OFF, disconnect the X3 and X4 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 11 X3



* Left front low level audio signal (-) - terminal 12 X3



* Right front low level audio signal (+) - terminal 3 X3



* Right front low level audio signal (-) - terminal 4 X3



* Subwoofer low level audio signal (+) - terminal 5 X4



* Subwoofer low level audio signal (-) - terminal 6 X4



* Center Channel low level audio signal (+) - terminal 13 X4



* Center Channel low level audio signal (-) - terminal 14 X4



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



* Left rear low level audio signal (-) - terminal 2



* Right rear low level audio signal (+) - terminal 3



* 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



rear seat audio (RSA) module.



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 rear seat audio (RSA)



module.



6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.



7. Disconnect the X2 harness connector at the amplifier.



8. 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 15



* Left rear low level audio signal (-) - terminal 14



* Right rear low level audio signal (+) - terminal 16



* Right rear low level audio signal (-) - terminal 8



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



rear seat audio (RSA) module.



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 rear seat audio (RSA)



module.



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



DTC Set by Audio Amplifier UQA



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 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

Friday, April 26, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 703


The BCM detects a short to ground in the CHMSL supply voltage circuit when the stop lamps are commanded ON.



Action Taken When the DTC Sets



The CHMSL will not illuminate.



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



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



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 harness connector at the center high mounted stop lamp.



2. Test for less than 5.0 ohm between the ground circuit terminal B and ground.



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



3. Connect a test lamp between the stop lamp control circuit terminal A and ground circuit terminal B.



4. Ignition ON, press and release the brake pedal. 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 voltage. 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 ground or an open/high resistance. If the circuit tests normal, replace



the BCM.



5. If all circuits test normal, test or replace the center high mounted stop lamp.



Repair Instructions



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



* High Mount Stop Lamp Replacement (Yukon Two-mode Hybrid) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and



Repair/High Mount Stop Lamp Replacement (Yukon Two-mode Hybrid))High Mount Stop Lamp Replacement (Yukon) (See: Lighting and



Horns/Center Mounted Brake Lamp/Service and Repair/High Mount Stop Lamp Replacement (Yukon))High Mount Stop Lamp Replacement



(Avalanche) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair/High Mount Stop Lamp Replacement (Avalanche)



)High Mount Stop Lamp Replacement (Escalade) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair/High Mount



Stop Lamp Replacement (Escalade))



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

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 241


* 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



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. 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

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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)



B2750



DTC B2750



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 B2750 00



- Horn Relay Coil Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) controls the horn relay by grounding the control circuit of the horn relay coil energizing the relay. When the horn



relay is energized, the horn relay contacts close applying voltage through the horn fuse and the horn control circuit to the horns.



Conditions for Running the DTC



When the output is actively being requested by the BCM.



Conditions for Setting the DTC



The BCM detects a short to ground, open or short to battery in the horn relay control circuit for approximately 125 milliseconds.



Action Taken When the DTC Sets



The BCM disables the output to the horn relay until the next ignition cycle.



Conditions for Clearing the DTC

Thursday, April 25, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 532


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



Repair Instructions



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



* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater



Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()



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



W/O HP2 With Memory



DTC B2435 or B2440 (w/o HP2 with Memory)



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 B2435 02



- Left Seat Back Heater Sensor Circuit Short to Ground



DTC B2435 05



- Left Seat Back Heater Sensor Circuit Short to Battery or Open



DTC B2440 02



- Right Seat Back Heater Sensor Circuit Short to Ground



DTC B2440 05



- Right Seat Back Heater Sensor Circuit Short to Battery or Open



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 15


* Driver steering wheel air bag wiring harness connector



* SDM wiring harness connector



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.



1. Verify that the driver steering wheel air bag connector and CPA are engaged.



锟斤拷 If the above condition is not found, make the appropriate repair.



2. Ignition OFF, disconnect the harness connector at the driver steering wheel air bag.



3. With the appropriate load tool adaptor, connect J 38715-A in place of the driver steering wheel air bag.



4. Ignition ON, with a scan tool, verify the appropriate DTC is set as current.



锟斤拷 If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A, reconnect the harness connector at the



driver steering wheel air bag, and cycle the ignition ON. If the DTC resets after reconnecting the air bag, then replace the driver steering



wheel air bag.



5. Ignition OFF, disconnect J 38715-A and the adaptor.



6. Disconnect the driver steering wheel air bag coil in-line connector.



7. With the appropriate load tool adaptor, connect special tool J 38715-A.



8. Ignition ON, with a scan tool, verify DTC is set as current.



锟斤拷 If DTC is not set or is set as history, replace the driver steering wheel air bag coil.



9. Ignition OFF, disconnect special tool J 38715-A and the adaptor.



10. Disconnect the harness connector at the SDM.



11. Ignition ON, test for less than 1 volt between the high circuit terminals listed below and ground.



* Driver steering wheel air bag coil connector Stage 1 terminal A X1



* Driver steering wheel air bag coil connector Stage 2 terminal A X2



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



12. Test for less than 1 volt between the low circuit terminals listed below and ground.



* Driver steering wheel air bag coil connector Stage 1 terminal B X1



* Driver steering wheel air bag coil connector Stage 2 terminal B X2



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



13. Ignition OFF, test for infinite resistance between the high circuit terminals listed below and ground.



* Driver steering wheel air bag coil connector Stage 1 terminal A X1



* Driver steering wheel air bag coil connector Stage 2 terminal A X2



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



14. Test for infinite resistance between the low circuit terminals listed below and ground.



* Driver steering wheel air bag coil connector Stage 1 terminal B X1



* Driver steering wheel air bag coil connector Stage 2 terminal B X2



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



15. Test for less then 1 ohm between the SDM connector and the air bag connector high circuit terminals listed below.



* Driver steering wheel air bag coil connector Stage 1 terminal A X1 and SDM terminal 4 X1.



* Driver steering wheel air bag coil connector Stage 2 terminal A X2 and SDM terminal 1 X1.



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



16. Test for less then 1 ohm between the SDM connector and the air bag connector low circuit terminals listed below.



* Driver steering wheel air bag coil connector Stage 1 terminal B X1 and SDM terminal 3 X1



* Driver steering wheel air bag coil connector Stage 2 terminal B X2 and SDM terminal 2 X1



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

Wednesday, April 24, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 481


Circuit/System Description



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



seat heater elements. The module controls the seat temperature by providing a PWM ground through the heated seat element control circuit to the



seat heater elements. The module 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 MSM must be powered and the heated seat must be enabled.



Conditions for Setting the DTC



B1935 04 or B2180 04



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

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



4. Ignition OFF, disconnect the harness connector at the PPS module.



5. Test for infinite resistance between the signal circuit terminal B and ground.



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



6. Ignition ON, test for less than 1 volt 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.



7. Test for less than 1 ohm between the PPS sensor signal circuit terminal B and the PPS module terminal 6.



锟斤拷 If greater than the specified range, test the signal circuit for open/high resistance. If the circuit tests normal, replace the PPS.



8. If all circuits test normal, replace the PPS which includes the pressure sensor.



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 replacement, setup, and programming



B0079



DTC B0079 or B0080



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 B0079 01



- Driver Seat Position Sensor Circuit Short to Battery



DTC B0079 02



- Driver Seat Position Sensor Circuit Short to Ground



DTC B0079 04



- Driver Seat Position Sensor Circuit Open



DTC B0079 05



- Driver Seat Position Sensor Circuit High Voltage or Open



DTC B0079 06



- Driver Seat Position Sensor Circuit Low Voltage or Open



DTC B0079 08



- Driver Seat Position Sensor Circuit Performance-Signal Invalid



DTC B0079 0C



- Driver Seat Position Sensor Circuit Low Current



DTC B0080 01



- Passenger Seat Position Sensor Circuit Short to Battery



DTC B0080 02



- Passenger Seat Position Sensor Circuit Short to Ground



DTC B0080 04



- Passenger Seat Position Sensor Circuit Open

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 486


B2345 13



Any of the temperature sensor inputs remains below 1.5 V for a seat back or 0.95 V for a seat cushion more than 1 second.



B2345 42



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



B2345 4B



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



Action Taken When the DTC Sets



The heated seat functions 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 a vehicle equipped with memory, refer to Circuit/System Testing below.



If the DTC set in a hybrid vehicle without memory, refer to DTC B2345 (HP2 w/o memory).



If the DTC set in a non-hybrid vehicle without memory, refer to DTC B2345 (Dealer installed).



If the DTC set in the rear heated seat module, refer to DTC B2345 (Rear seat).



Circuit/System Testing



B2345 00



1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.



2. Test for infinite resistance between the control circuit terminal 14 X1 and ground.



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



* Driver seat cushion and seat back terminal 14 X1



* Driver seat cushion element terminal 11 X1



* Driver seat back element terminal 1 X1



3. Test for infinite resistance between the control circuit terminal 6 X1 and ground.

Tuesday, April 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 361


Connector End View Reference



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



Description and Operation



Active Noise Cancellation Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Active Noise



Cancellation 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 appropriate microphone.



2. Ignition ON Radio ON, test for 0.47-2.75 V between the microphone (-) signal circuit terminal A and ground.



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



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



amplifier.



3. Test for 5.75-8.03 V between the microphone (+) signal circuit terminal B and ground.



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



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



amplifier.



4. If all circuits test normal, replace the appropriate microphone.



Repair Instructions



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



* Radio Volume Compensator Interior Noise Microphone Replacement (Floor Console) (See: Accessories and Optional Equipment/Radio,



Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior Noise Microphone



Replacement (Floor Console))Radio Volume Compensator Interior Noise Microphone Replacement (Headliner) (See: Accessories and



Optional Equipment/Radio, Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior



Noise Microphone Replacement (Headliner))



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



B1287



DTC B1287



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 B1287 01



- Amplifier Control Signal Circuit Short to Battery



DTC B1287 02



- Amplifier Control Signal Circuit Short to Ground

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 163


Connector End View Reference



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



Description and Operation



Active Noise Cancellation Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Active Noise



Cancellation 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 appropriate microphone.



2. Ignition ON Radio ON, test for 0.47-2.75 V between the microphone (-) signal circuit terminal A and ground.



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



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



amplifier.



3. Test for 5.75-8.03 V between the microphone (+) signal circuit terminal B and ground.



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



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



amplifier.



4. If all circuits test normal, replace the appropriate microphone.



Repair Instructions



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



* Radio Volume Compensator Interior Noise Microphone Replacement (Floor Console) (See: Accessories and Optional Equipment/Radio,



Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior Noise Microphone



Replacement (Floor Console))Radio Volume Compensator Interior Noise Microphone Replacement (Headliner) (See: Accessories and



Optional Equipment/Radio, Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior



Noise Microphone Replacement (Headliner))



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



B137A



DTC B137A



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 B137A 01



- Hybrid Accessory Wake Up Circuit - Short to Battery



DTC B137A 06



- Hybrid Accessory Wake Up Circuit - Short to Ground or Open

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 231


Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))



* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and



Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (See:



Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator



Replacement (Delphi))



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



programming



B0433



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



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



B0228 02



- Recirculation Position Feedback Circuit Short to Ground



B0228 04



- Recirculation Position Circuit Actuator Stuck



B0228 05



- Recirculation Position Feedback Circuit Short to Battery or Open



B0228 61



- Recirculation Position Circuit Actuator Out of Range



B0413 02



- Temperature Control 1 Feedback Circuit Short to Ground



B0413 04



- Temperature Control 1 Feedback Circuit Actuator Stuck



B0413 05



- Temperature Control 1 Feedback Circuit Short to Battery or Open



B0413 61



- Temperature Control 1 Feedback Circuit Actuator out of Range



B0423 02



- Temperature Control 2 Feedback Circuit Short to Ground



B0423 04



- Temperature Control 2 Circuit Actuator Stuck



B0423 05



- Temperature Control 2 Feedback Circuit Short to Battery or Open



B0423 61



- Temperature Control 2 Circuit Actuator Out of Range



B0433 02



- Temperature Control 3 Feedback Circuit Short to Ground



B0433 04



- Temperature Control 3 Circuit Actuator Stuck



B0433 05



- Temperature Control 3 Feedback Circuit Short to Battery or Open



B0433 61



- Temperature Control 3 Circuit Actuator Out of Range

Monday, April 22, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 142


* 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



B0086



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



DTC B0085 39



- LF Side Impact Sensor Internal Electronic Failure



DTC B0085 3A



- LF Side Impact Sensor Incorrect Component Installed



DTC B0085 71



- LF Side Impact Sensor Invalid Serial Data Received



DTC B0086 00



- RF Side Impact Sensor No Additional Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 167


Repair Instructions



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



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



Procedures/Wiring Repairs/GMLAN Wiring Repairs)



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



B153A



DTC B153A



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 B153A 00



- Liftgate Latch Switch Signal Circuit



DTC B153A 08



- Liftgate Latch Switch Signal Circuit Signal Invalid



Diagnostic Fault Information



Circuit/System Description



The ratchet, pawl, and sector switches are part of the liftgate latch assembly and are used by the liftgate module (LGM) to determine the state of the



latch during the process of latching or unlatching. The ratchet and pawl switches will be inactive when the primary and secondary latches are latched,

Sunday, April 21, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 272


Conditions for Setting the DTC



* The BCM detects excessive current in the cruise control indicator signal circuit.



* The above condition is present for greater than 5 seconds.



Actions Taken When the DTC Sets



* The malfunction indicator lamp (MIL) will not illuminate.



* The cruise control system is disabled.



Conditions for Clearing the DTC



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



* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.



Reference Information



Schematic Reference



Cruise Control Schematics (See: Cruise Control/Diagrams/Electrical Diagrams)



Connector End View Reference



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



Description and Operation



Cruise Control Description and Operation (See: Cruise Control/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 steering wheel controls switch - left.



2. Ignition ON, verify that a test lamp illuminates between the signal circuit terminal 9 and B+.



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



replace the BCM.



3. If all circuits test normal, test or replace the steering wheel controls switch - left.



Repair Instructions



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



* Steering Wheel Control Switch Assembly Replacement (See: Accessories and Optional Equipment/Sensors and Switches - Accessories and



Optional Equipment/Steering Mounted Controls Assembly/Service and Repair)



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



B0958



DTC B0958, B0959, B0960, or B0961



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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 251


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 B0775 01



- 4 High Indicator Circuit Short to Battery



DTC B0775 06



- 4 High Indicator Circuit Short to Ground or Open



Diagnostic Fault Information



Circuit/System Description



The 4 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 4 High mode has been



selected by the driver, the transfer case shift control module (TCCM) provides a ground through the 4 High indicator control circuit illuminating the



LED. The TCCM tests the 4 High indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming



control circuit by grounding the 4 High indicator control circuit for 2 seconds during the bulb test at key ON.



Conditions for Running the DTC



B0775 01



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the AWD indicator is commanded ON.



B0775 06



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the AWD indicator is commanded OFF.



Conditions for Setting the DTC



B0775 01



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



B0775 06



The TCCM detects 1.6 V or less for 1.5 seconds on the AWD indicator control circuit when the AWD 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 AWD indicator control circuit will cause the AWD indicator to remain ON at all times.



* An open or high resistance on the AWD indicator control circuit will cause the AWD indicator to be inoperative during the 2 second bulb

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 469


Circuit/System Description



The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat



heating element. The heated seat module (HSM) supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground through



the low reference circuit to the sensor. The module monitors the voltage of the sensor signal circuit to determine the temperature of the seat. The



temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat reaches



the set temperature, the module will then cycle the control circuit of the heating elements ON and OFF in order to maintain the desired seat



temperature based on the feedback voltage from the sensor.



Conditions for Running the DTC



The HSM must be powered.



Conditions for Setting the DTC



B1925 02 or B2170 02



The temperature sensor voltage drops below 0.80 V for more than 1 second.



B1925 05 or B2170 05



The temperature sensor voltage is greater than 5 V for more than 1 second.



Action Taken When the DTC Sets



The heated seat function for the affected seat will be disabled.



Conditions for Clearing the DTC



* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back to



ACC or RUN.



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

Saturday, April 20, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 397


DTC B1449 07



- Remote Device Voltage Above Threshold



Diagnostic Fault Information



Circuit/System Description



The infrared module is supplied with 10.5 volts from the rear audio/HVAC module when the rear audio system is active. The infrared module is



permanently grounded at G300.



Conditions for Running the DTC



* Ignition ON.



* Battery voltage must be between 9-16 volts.



Conditions for Setting the DTC



The DTC will set when the rear audio/HVAC module detects a short to voltage, short to ground, or an open/high resistance in the infrared module



voltage signal circuit.



Action Taken When the DTC Sets



The rear audio/HVAC module sets the DTC and the infrared module will be disabled.



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.



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)



Description and Operation



Video Entertainment System Description and Operation (Non-Headrest DVD Systems) (See: Accessories and Optional Equipment/Description and



Operation/Video Entertainment System Description and Operation (Non-Headrest DVD Systems))Video Entertainment System Description and



Operation (Dual Headrest DVD Systems) (See: Accessories and Optional Equipment/Description and Operation/Video Entertainment System



Description and Operation (Dual Headrest DVD Systems))



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 infrared module.



2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal 12 and ground.



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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 306


- Audio Output 6 Circuit Open (Subwoofer)



DTC B1085 01



- Audio Output 7 Circuit Short to Battery (LR D-Pillar)



DTC B1085 02



- Audio Output 7 Circuit Short to Ground (LR D-Pillar)



DTC B1085 04



- Audio Output 7 Circuit Open (LR D-Pillar)



DTC B1095 01



- Audio Output 8 Circuit Short to Battery (RR D-Pillar)



DTC B1095 02



- Audio Output 8 Circuit Short to Ground (RR D-Pillar)



DTC B1095 04



- Audio Output 8 Circuit Open (RR D-Pillar)



Diagnostic Fault Information



Circuit/System Description



Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage.



When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is



produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone



to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as



the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and



slightly higher.



Conditions for Running the DTC



The radio is ON.



Conditions for Setting the DTC



Set by Radio



The radio sets a current status for this DTC when a short to ground, short to voltage or an open is detected on any of the speaker channel outputs



from the radio.



Set by Bose Amplifier



The DTC will not set during normal amplifier operation. The vehicle must have the ignition OFF for several hours and the fault must be present



during amplifier power-up.



DTC B1025 01, B1035 01, B1045 01, B1055 01, B1065 01, B1075 01, B1085 01, B1095 01



A short to voltage is detected on the specified (+) or (-) signal circuit



DTC B1025 02, B1035 02, B1045 02, B1055 02, B1065 02, B1075 02, B1085 02, B1095 02

Friday, April 19, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 344


* 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.



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



5. 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.



Repair Instructions



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



* Speaker Replacement Reference (See: Accessories and Optional Equipment/Testing and Inspection/Symptom Related Diagnostic



Procedures/Cellular, Entertainment, and Navigation/Speaker Replacement Reference)



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



programming



B1085



DTC B1025-B1095



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) provide an overview of each diagnostic category.



DTC Descriptors



DTC B1025 01



- Audio Output 1 Left Front Circuit Short to Battery



DTC B1025 02



- Audio Output 1 Left Front Circuit Short to Ground



DTC B1025 04



- Audio Output 1 Left Front Circuit Open



DTC B1035 01



- Audio Output 2 Right Front Circuit Short to Battery



DTC B1035 02



- Audio Output 2 Right Front Circuit Short to Ground



DTC B1035 04



- Audio Output 2 Right Front Circuit Open



DTC B1045 01



- Audio Output 3 Left Rear Circuit Short to Battery



DTC B1045 02



- Audio Output 3 Left Rear Circuit Short to Ground