2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 116

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 passenger seat belt tension sensor signal circuit terminal C X2 and ground.

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

7. Test for less than 1 ohm between the PPS module signal circuit terminal 4(X88+HP2/Z88+HP2) or terminal 6 (-HP2/Z75+HP2) and the

passenger seat belt tension sensor terminal C X2.

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

8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt tension 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)

* Driver or Passenger Seat Belt Buckle Replacement (with HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt

Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle Replacement)Driver or Passenger Seat Belt Buckle Replacement (without

HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle

Replacement)

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

B0074

DTC B0074

Diagnostic Instructions

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

Check - Vehicle) prior to using the diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0074 03

- Passenger Occupant Classification Sensor Circuit Voltage Below Threshold

DTC B0074 07

- Passenger Occupant Classification Circuit Voltage Above Threshold

DTC B0074 08

- Passenger Occupant Classification Circuit Signal Invalid

Diagnostic Fault Information

Circuit/System Description

The passenger presence system (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a

hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by

the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself and

if a fault in this circuit occurs, a DTC will set. When the sensing and diagnostic module (SDM) detects this DTC within the PPS, it will notify the

customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will

communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then suppress the deployment of the

instrument panel (I/P) module and then illuminate the AIR BAG indicator.

Conditions for Running the DTC

1Pair High Position Car LED Amber Flowing Turn Signal Lights+Red Brake 3000K

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 442

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

B1820

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

Brake Hose Rear For BMW E36 E46 1165174

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 610

* The DTC clears when the fault is no longer detected.

* The current DTC will become history when the request for the output is removed.

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

Reference Information

Schematic Reference

Horn Schematics (See: Lighting and Horns/Horn/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Horns System Description and Operation (See: Lighting and Horns/Horn/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

Command the horn ON and OFF with the scan tool. The horn should turn ON and OFF when changing between the commanded states.

Circuit/System Testing

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

2. Connect a test lamp between the control circuit terminal G1 and B+.

3. Press and release the horn switch. 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 or a sticking horn switch. 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, an open high resistance, or a horn switch which is not closing.

If the circuit tests normal, replace the BCM.

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

Repair Instructions

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

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

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

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

B2850

DTC B2850, B2855, B2870, or B2875

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 370

* The current DTC will clear and set the code to history, 3 seconds after no motor movement is requested or the current is no longer

mismatched, 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.

Reference Information

Schematic Reference

* Driver Seat Schematics ()

* Adjustable Pedal Schematics (See: Accessories and Optional Equipment/Pedal Positioning System/Diagrams/Electrical Diagrams)

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 Testing

DTC B1335 00 or B1335 0B

1. Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.

2. Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between

each motor test.

* Driver seat front vertical motor

* Driver seat rear vertical motor

* Driver seat horizontal motor

* Driver seat recline motor

* Driver seat lumbar horizontal motor

* Driver seat lumbar vertical motor

* Adjustable pedal motor

3. Clear the diagnostic trouble codes.

4. Ignition OFF, disconnect the X1 harness connector at the appropriate seat adjuster assembly, lumbar adjuster assembly, or the adjustable pedal

motor for which the DTC set.

5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 00 or B1335 0B should not set.

锟斤拷 If the DTC sets, test for a short between appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.

* Front vertical motor terminal 2 and terminal 5

* Rear vertical motor terminal 1 and terminal 4

* Seat horizontal motor terminal 3 and terminal 6

* Seat recline motor terminal A and terminal B

* Lumbar vertical motor terminal A and terminal B

* Lumbar horizontal motor terminal C and terminal D

* Adjustable pedal motor terminal 4 and terminal 5

6. Test the appropriate control circuits listed below for a high resistance. If all circuits test normal, test or replace the appropriate seat, lumbar, or

adjustable pedal motor.

* Front vertical motor terminal 2 and terminal 5

* Rear vertical motor terminal 1 and terminal 4

* Seat horizontal motor terminal 3 and terminal 6

* Seat recline motor terminal A and terminal B

* Lumbar vertical motor terminal A and terminal B

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 244

* 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 B0770 01

- AWD Indicator Circuit Short to Battery

DTC B0770 06

- AWD Indicator Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit/System Description

The all wheel drive (AWD) 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, 4 Low and 4 High LEDs. When the

AWD mode has been selected by the driver, the transfer case shift control module (TCCM) provides a ground through the AWD indicator control

circuit illuminating the LED. The TCCM tests the AWD indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the

indicator dimming control circuit, by grounding the AWD indicator control circuit for 2 seconds during the bulb test at key ON.

Conditions for Running the DTC

B0770 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 OFF.

B0770 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 ON.

Conditions for Setting the DTC

B0770 01

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

B0770 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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 377

Reference Information

Schematic Reference

* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)

* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Distribution Schematics)

Connector End View Reference

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

Description and Operation

Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode 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. Verify that the following DTCs are not set: U1814, B1428.

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

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

2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding

ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in

correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Inspect for an B+ fuse to the ignition switch. The fuse should be OK.

锟斤拷 If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.

* B+

* Accessory voltage

* Off/Run/Crank voltage

* Ignition 1 voltage

* Accessory wakeup serial data (BCM output)

* Run/crank ignition 1 voltage (BCM output)

2. Disconnect the harness connector at the ignition switch.

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

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 483

4. Test for 3.5 - 11.5 Ohms between control circuit terminal 14 and control circuit terminal 1.

锟斤拷 If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heater element.

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

heater element.

5. Disconnect the X2, X5 harness connectors at the MSM.

6. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 4 X5 and the low reference circuit terminal 2 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.

7. Connect the X1, X2, X5 harness connectors at the MSM.

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

9. 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

MSM.

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 MSM.

10. If all circuits test normal, replace the MSM.

B2180 0A, B2180 0B, B2180 0C, B2180 0D, B2180 0E, B2180 04, or B2180 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.

4. Test for 3.5 - 11.5 Ohms between control circuit terminal 6 and control circuit terminal 4.

锟斤拷 If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heater element.

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

heater element.

5. Disconnect the X2, X5 harness connectors at the MSM.

6. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 3 X5 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.

7. Connect the X1, X2, X5 harness connectors at the MSM.

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

9. 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

MSM.

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 MSM.

10. If all circuits test normal, replace the MSM.

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 MSM replacement, setup, and programming

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 514

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

B2425 0C, B2445 0D, B2430 0C, or B2430 0D

By measuring output current, the RHSM 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 the rear heated seat module, refer to Circuit/System Testing below.

If the DTC set in a vehicle equipped with memory, refer to DTC B2425 or B2430 (w/o HP2 with memory).

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).

Circuit/System Testing

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

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

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.

2. Test for 2.5 - 8.5 Ohms between control circuit terminal 3 and control circuit terminal 5.

锟斤拷 If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heater

element.

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

heater element.

3. Disconnect the X2, X4 harness connectors at the RHSM.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 286

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 object

alarm module.

3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.

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

alarm module.

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

replace the object alarm module.

Repair Instructions

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

* Rear Object Sensor Replacement (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Parking Assist

Distance Sensor/Service and Repair/Rear Object Sensor Replacement)

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

programming

B0967

DTC B0967

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 B0967 02

- Parking Aid Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The parking assist system can be disabled by pressing the parking assist disable switch. When pressed, the parking assist disable signal circuit is

pulled to ground. When the parking assist system is disabled, the object alarm module will ground the parking assist disable indicator control circuit,

illuminating the indicator.

Conditions for Running the DTC

* DTC B1325 is not set

* Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The object alarm module has detected that the parking assist disable switch signal circuit is shorted to ground.

Action Taken When the DTC Sets

* The parking assist system is disabled.

* The parking assist disable indicator is not illuminated.

* The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the

driver information center (DIC).

Conditions for Clearing

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 464

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 B1925 or B2170 (w/o HP2 with memory).

If the DTC set in the rear heated seat module, refer to DTC B1925 or B2170 (Rear seat).

Circuit/System Testing

B1925 02, B1925 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 9 X4 and the low reference circuit terminal 6 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

cushion 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 cushion heater element/temperature sensor.

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

4. Disconnect the harness connector at the seat cushion 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.

B2170 02 or B2170 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 20 X4 and the low reference circuit terminal 8 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

cushion 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 cushion heater element/temperature sensor.

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

4. Disconnect the harness connector at the seat cushion 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

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 336

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

* 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 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 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:

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 125

B0081 0F

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

B0081 3A

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

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

B0081 4B

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

B0081 5A

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

B0081 39

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

B0081 71

The SDM sets this DTC when the SDM has received invalid serial data from the PPS module.

Action Taken When the DTC Sets

* The SDM disables the passenger instrument cluster air bag.

* The PPS module will illuminate the Passenger Airbag On/Off indicator status as OFF.

* When the PPS module sets this DTC, the PPS module communicates with the SDM to turn the AIRBAG indicator on.

* When the SDM sets this DTC, the SDM will turn the AIRBAG indicator on.

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

Conditions for Clearing the DTC

* The condition for setting the DTC no longer exists and there is no activity on the low speed serial data circuits.

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

Diagnostic Aids

If either the SDM or PPS module were replaced, verify that the correct replacement part numbers were used for this vehicle.

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 359

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Special Tools

EL-48028 Digital Radio Test Antenna

Circuit System Verification

With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal

message is not displayed on the radio.

Circuit/System Testing

1. Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 to the DRR.

2. Radio ON, tuned to XM, verify DTC B1259 is not set as current.

锟斤拷 If the DTC is current, replace the DRR.

3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.

4. Ignition ON, test for 4.5-5.5 volts between the antenna coax center terminal and the coax outer shield.

锟斤拷 If not within the specified range, replace the antenna coax.

5. If all circuits test normal, replace the digital radio antenna.

Repair Instructions

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

* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service

and Repair/Cellular Communications/Digital Radio Antenna Replacement)

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

B1277

DTC B1277, B127C, or B127D

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 B1277 01

- Microphone 1 (LF) Input Signal Circuit Short to Battery

DTC B1277 02

- Microphone 1 (LF) Input Signal Circuit Short to Ground

DTC B1277 04

- Microphone 1 (LF) Input Signal Circuit Open

DTC B1277 1A

- Microphone 1 (LF) Input Signal Circuit Bias Level Out of Range

DTC B127C 01

- Microphone 2 (RF) Input Signal Circuit Short to Battery

DTC B127C 02

- Microphone 2 (RF) Input Signal Circuit Short to Ground

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 662

The BCM clears this code from current when the fault is removed from the system.

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 Verification

Ignition ON, headlamp switch to HEAD, vary the interior lamp dimming switch from dim to full bright. The I/P lamps should dim and then become

full bright.

Circuit/System Testing

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

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

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

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

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

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

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

replace the BCM.

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

Dimming Control Signal parameter is greater than 2.6 V.

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

BCM.

6. If all circuits test normal, test or replace the headlamp switch.

Repair Instructions

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

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

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

and Repair/Headlamp Switch Replacement (Except Cadillac))

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 552

* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (See:

Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure.

Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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

Electrical Information Reference

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

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 Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate handle and liftgate close switches.

The value should change between Active and Inactive.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the liftgate handle and liftgate close switches.

2. Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.

锟斤拷 If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the LGM.

3. Ignition OFF, connect the harness connector at the liftgate close switch.

4. Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate close switch, the parameter

should change between Active and Inactive.

锟斤拷 If the value does not change, test or replace the liftgate close switch.

5. If all circuits test normal, test or replace the liftgate handle switch.

Component Testing

Liftgate Handle Switch

1. Ignition OFF, disconnect the harness connector at the liftgate handle switch.

2. Test for infinite resistance between the signal terminal A and the low reference terminal B with the switch in the open position.

锟斤拷 If not the specified value, replace the liftgate handle switch.

3. Test for less than 2 ohms between the signal terminal A and the low reference terminal B with the switch in the closed position.

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

Liftgate Close Switch

1. Ignition OFF, disconnect the harness connector at the liftgate close switch.

2. Test for infinite resistance between the signal terminal D and the low reference terminal A with the switch in the open position.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 577

5. If all circuits test normal, test or replace the headlamp switch.

Repair Instructions

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

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

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

and Repair/Headlamp Switch Replacement (Except Cadillac))

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

B2545

DTC B2545

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 B2545 00

- Backup Lamps Circuit

Diagnostic Fault Information

Circuit/System Description

When the transmission is placed in the REVERSE position, the transmission control module (TCM) sends a serial data message to the body control

module (BCM). The message indicates that the gear selector is in the REVERSE position. The BCM applies voltage to the backup lamp relay

control circuit energizing the backup lamp relay coil. With the relay coil energized, the switch contacts close allowing battery voltage to flow

through the VEH BCK/UP fuse to the left and right backup lamps. The BCM also supplies voltage the to inside rearview mirror via the backup lamp

relay control circuit for automatic day/night operation. Once the driver moves the gear selector out of the REVERSE position, a serial data message

is sent by the TCM requesting the BCM to remove voltage from the backup lamp control circuit.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the backup lamp relay control circuit.

Action Taken When the DTC Sets

The backup lamps will not operate.

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.

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Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the LGM.

2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.

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

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 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, replace the LGM.

4. Ignition OFF, connect the X2 harness connector and disconnect the X3 harness connector at the LGM.

5. Test for less than 15 ohms between the control terminal 1 at the LGM and ground.

锟斤拷 If greater than the specified range, replace the LGM.

6. Test for less than 15 ohms between the control terminal 2 at the LGM and ground.

锟斤拷 If greater than the specified range, replace the LGM

7. Install a 15A fused jumper wire between the control circuit terminal 1 at the liftgate motor assembly and 12 volts. Momentarily install a

jumper wire between the control circuit terminal 2 at the liftgate motor assembly and ground. The liftgate motor should perform the OPEN or

CLOSE function.

锟斤拷 If the function does not perform as specified, replace the liftgate motor assembly.

8. Install a 15A fused jumper wire between the control circuit terminal 2 and 12 volts. Momentarily install a jumper wire between the control

circuit terminal 1 and ground. The liftgate motor should perform the CLOSE or OPEN function.

锟斤拷 If the function does not perform as specified, replace the liftgate motor assembly.

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

Repair Instructions

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

* Liftgate Close Actuator Motor Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Motor/Service

and Repair/Liftgate Close Actuator Motor Replacement)

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

B396B

DTC B396B

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 B396B 01

- Liftgate Motor Clutch Control Circuit Short to Battery

DTC B396B 02

- Liftgate Motor Clutch Control Circuit Short to Ground

DTC B396B 04

- Liftgate Motor Clutch Control Circuit Open

Diagnostic Fault Information

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 46

Circuit/System Testing

DTC B0014-B0018 or B0021-B0045

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

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

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

* Left roof rail air bag terminal 1 and 2

* Right roof rail air bag terminal 1 and 2

* Driver seat side air bag terminal 1 and 2

* Passenger seat side air bag terminal 1 and 2

* Driver seat belt retractor pretensioner terminal 1 and 2

* Passenger seat belt retractor pretensioner terminal 1 and 2

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

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

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

* Roof rail air bag control circuit terminal 1

* Roof rail air bag control circuit terminal 2

* Seat side air bag control circuit terminal 1

* Seat side air bag control circuit terminal 2

* Retractor pretensioner control circuit terminal 1

* Retractor pretensioner control circuit terminal 2

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.

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

* Roof rail air bag control circuit terminal 1

* Roof rail air bag control circuit terminal 2

* Seat side air bag control circuit terminal 1

* Seat side air bag control circuit terminal 2

* Retractor pretensioner control circuit terminal 1

* Retractor pretensioner control circuit terminal 2

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.

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

* Left roof rail airbag terminal 1 and 2

* Right roof rail airbag terminal 1 and 2

* Driver seat side airbag terminal 1 and 2

* Passenger seat side airbag terminal 1 and 2

* Driver seat belt retractor pretensioner terminal 1 and 2

* Passenger seat belt retractor pretensioner terminal 1 and 2

7. 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.

8. If all circuits test normal, replace the roof rail air bag, seat side air bag, or seat belt pretensioner.

DTC B0019-B0020

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 232

B3779 02

- Air Flow Control 9 Feedback Circuit Short to Ground

B3779 04

- Air Flow Control 9 Circuit Actuator Stuck

B3779 05

- Air Flow Control 9 Feedback Circuit Short to Battery or Open

B3779 61

- Air Flow Control 9 Circuit Actuator Out of Range

B3782 02

- Air Flow Control 10 Feedback Circuit Short to Ground

B3782 04

- Air Flow Control 10 Circuit Actuator Stuck

B3782 05

- Air Flow Control 10 Feedback Circuit Short to Battery or Open

B3782 61

- Air Flow Control 10 Circuit Actuator Out of Range

Circuit/System Description

The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an

electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC

control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on

the door position signal circuit changes. The control circuit uses either a 0, 2.5 or 5-volt signal to command the actuator movement. When the

actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions.

* B0228 is for the recirculation actuator.

* B0413 is for the drivers air temperature actuator.

* B0423 is for the passenger air temperature actuator.

* B0433 is for the auxiliary air temperature actuator.

* B3779 is for the mode actuator.

* B3782 is for the auxiliary mode actuator.

Conditions for Running the DTC

* Ignition ON.

* The HVAC module is ON.

Conditions for Setting the DTC

The actual door position differs from the commanded door position by more than 4 counts or the HVAC control module detects the door position

signal circuit is less than 3 counts or greater than 253 counts.

Action Taken When the DTC Sets

The control circuit is deactivated for the appropriate actuator.

Conditions for Clearing the DTC

* The DTC becomes history when 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 Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery

Description and Operation)

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 654

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Right Side)

* Duct Air Temperature Sensor Replacement - Upper Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Left Side)

* Air Temperature Sensor Replacement - Lower Auxiliary (Delphi) (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Air Temperature Sensor Replacement - Lower Auxiliary (Delphi))

* Duct Air Temperature Sensor Replacement - Lower Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Left Side)

* Duct Air Temperature Sensor Replacement - Lower Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Right Side)

* Ambient Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Ambient Temperature Sensor / Switch HVAC/Service

and Repair)

* Inside Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair)

* Auxiliary Inside Air Temperature Sensor Assembly Replacement (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Auxiliary Inside Air Temperature Sensor Assembly Replacement)

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

programming

B3583

DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583

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 B0158 02

- Outside Air Temperature Sensor Circuit Short to Ground

DTC B0158 05

- Outside Air Temperature Sensor Circuit Short to Battery or Open

DTC B0163 02

- Passenger Compartment Temp Sensor 1 Circuit Short to Ground

DTC B0163 05

- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open

DTC B0168 02

- Passenger Compartment Temp Sensor 2 Circuit Short to Ground

DTC B0168 05

- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open

DTC B0173 02

- Output Air Temperature Sensor 1 Circuit Short to Ground

DTC B0173 05

- Output Air Temperature Sensor 1 Circuit Short to Battery or Open

DTC B0178 02

- Output Air Temperature Sensor 2 Circuit Short to Ground

DTC B0178 05

- Output Air Temperature Sensor 2 Circuit Short to Battery or Open

DTC B0509 02

- Output Air Temperature Sensor 3 Circuit Short to Ground

DTC B0509 05

- Output Air Temperature Sensor 3 Circuit Short to Battery or Open

DTC B0514 02

- Output Air Temperature Sensor 4 Circuit Short to Ground

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 110

鈬揑f infinite resistance

4.3Test for less than 2 锟?in the 10 V reference circuits 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 greater than 11 V

4.1Ignition OFF, disconnect the X2 harness connector at the Assist Step Control Module control module, ignition ON.

4.2Test for less than 1 V between the following 10 V reference circuit and ground.

-X2 Terminal A Running Board - Left

-X2 Terminal B Running Board - Right

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

-If less than 1 V, replace the Assist Step Control Module.

锟?If between 9-11 V

5.Ignition OFF. Connect Running Board - Left actuator. Ignition ON.

6.Test for 9 - 11 V between the 10 V reference circuit terminal D at the right side and ground while commanding the actuator with the scan

tool.

-

If not between 9-11 V

Test or replace Running Board - Left actuator.

锟?If between 9-11 V

7.Ignition OFF. Disconnect Running Board - Left, connect Running Board - Right. Ignition ON.

8.Test for 9 - 11 V between the 10 V reference circuit terminal D at the left side and ground while commanding the actuator with the scan tool.

-

If not between 9-11 V

Test or replace Running Board - Right actuator.

锟?If between 9-11 V

9.Test for greater than 9 V between the appropriate signal circuit terminal E and ground while commanding the actuator with the scan tool.

-

If not greater than 9 V

9.1Ignition OFF, disconnect the X2 harness connector at the Assist Step Control Module.

9.2Test for infinite resistance between the following signal circuit terminals and ground.

-X2 Terminal C Running Board - Left

-X2 Terminal D Running Board - Right

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

鈬揑f infinite resistance

9.3Test for less than 2 锟?in the signal circuits 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 9 V or greater

10.Connect a test lamp between the control circuit terminal A and the control circuit terminal B.

11.Verify the test lamp turns on and off while commanding the appropriate board to Extend and Retract with a scan tool.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 689

* 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 rear windows UP and DOWN by using the window switches on the driver master control and their respective rear

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

Circuit/System Testing

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

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

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

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

BCM.

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

Repair Instructions

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

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

Replacement)

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

B3822

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.