2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 694

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

window switch on the driver master control.

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

BCM.

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

Repair Instructions

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

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

Replacement)

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

B3824

DTC B3821 or B3824

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 B3821 00

- Left Rear Window Relay Power Circuit

DTC B3824 00

- Right Rear Window Relay Power Circuit

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 714

* Front vertical motor terminal 13

* Rear vertical motor terminal 15

* Rear vertical motor terminal 16

* Seat horizontal motor terminal 9

* Seat horizontal motor terminal 10

锟斤拷 If not the specified value, test the control circuit for a short to ground.

4. Ignition OFF, disconnect the X4 harness connector at the MSM.

5. Ignition ON, verify that a test lamp does not illuminate between the control circuits listed below and ground:

* Lumbar horizontal motor terminal 12

* Lumbar horizontal motor terminal 13

* Seat recline motor terminal 15

* Seat recline motor terminal 16

* Adjustable pedal actuator terminal 9

* Adjustable pedal actuator terminal 10

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

6. Test for infinite resistance between the control circuits listed below and ground:

* Lumbar horizontal motor terminal 12

* Lumbar horizontal motor terminal 13

* Seat recline motor terminal 15

* Seat recline motor terminal 16

* Adjustable pedal actuator terminal 9

* Adjustable pedal actuator terminal 10

锟斤拷 If not the specified value, test the control circuit for a short to ground.

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

B3921 01 or B3921 02

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

2. Ignition ON, verify that a test lamp does not illuminate between the control circuits listed below and ground:

* Lumbar vertical motor terminal 1

* Lumbar vertical motor terminal 2

* Steering wheel tilt actuator terminal 7

* Steering wheel tilt actuator terminal 8

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

3. Test for infinite resistance between the control circuits listed below and ground:

* Lumbar vertical motor terminal 1

* Lumbar vertical motor terminal 2

* Steering wheel tilt actuator terminal 7

* Steering wheel tilt actuator terminal 8

锟斤拷 If not the specified value, test the control circuit for a short to ground.

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

Repair Instructions

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

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

* Front Seat Recliner Actuator Motor Replacement ()

* Seat Lumbar Sub System Replacement ()

* Brake Pedal Assembly Replacement (See: Accessories and Optional Equipment/Pedal Positioning System/Service and Repair/Removal and

Replacement/Brake Pedal Assembly Replacement)

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

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 307

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

DTC B1025 04, B1035 04, B1045 04, B1055 04, B1065 04, B1075 04, B1085 04, B1095 04

An open is detected on the specified (+) or (-) signal circuit

Action Taken When the DTC Sets

No sound is present from one or more of the speakers.

Conditions for Clearing the DTC

Set by Radio

The fault condition becomes history if not present for 0.25 seconds.

Set by Bose Amplifier

The fault condition becomes history after the vehicle ignition has been OFF for several hours and then the ignition turns ON.

Diagnostic Aids

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

up-level radios.

Reference Information

Schematic Reference

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

Schematics)

Connector End View Reference

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

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

even sound.

Circuit/System Testing

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

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

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

speaker testing.

Without Amplifier

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

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

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

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

radio.

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 345

- Audio Output 3 Left Rear Circuit Open

DTC B1055 01

- Audio Output 4 Right Rear Circuit Short to Battery

DTC B1055 02

- Audio Output 4 Right Rear Circuit Short to Ground

DTC B1055 04

- Audio Output 4 Right Rear Circuit Open

DTC B1065 01

- Audio Output 5 Circuit Short to Battery (Center IP)

DTC B1065 02

- Audio Output 5 Circuit Short to Ground (Center IP)

DTC B1065 04

- Audio Output 5 Circuit Open (Center IP)

DTC B1075 01

- Audio Output 6 Circuit Short to Battery (Subwoofer)

DTC B1075 02

- Audio Output 6 Circuit Short to Ground (Subwoofer)

DTC B1075 04

- 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

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 704

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 B3891 02

- Trailer Fog Lamps Circuit Short to Ground

DTC B3891 05

- Trailer Fog Lamps Circuit Short to Battery or Open

Diagnostic Fault Information

Circuit/System Description

When the rear fog lamp switch is placed in the ON position, ground is applied to the auxiliary body control module (XBCM) through the rear fog

lamp switch circuit. The XBCM then applies voltage on the trailer fog lamp circuit to the trailer rear fog lamp.

Conditions for Running the DTC

The ignition is ON. Park lamps must be ON and the rear fog lamps must be commanded ON.

Conditions for Setting the DTC

The body control module (BCM) detects an open, short to ground, or short to voltage on the trailer rear fog lamp circuit while trying to apply a

voltage to the circuit.

Action Taken When the DTC Sets

The trailer rear fog lamps do 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

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 240

The air temperature sensors are a 2-wire negative temperature co-efficient thermistor. The vehicle uses the following air temperature sensors:

* Ambient Air Temperature Sensor

* Inside Air Temperature Sensor Assembly

* Upper Left Air Temperature Sensor

* Upper Right Air Temperature Sensor

* Lower Left Air Temperature Sensor

* Lower Right Air Temperature Sensor

* Upper Auxiliary Air Temperature Sensor

* Lower Auxiliary Air Temperature Sensor

* Auxiliary Inside Air Temperature Sensor

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

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

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

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

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

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

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

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

Diagnostic Aids

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

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

seconds.

Action Taken When the DTC Sets

The system operates using a default value.

Conditions for Clearing the DTC

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

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

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 323

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:

* 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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 510

Circuit/System Description

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

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

Conditions for Setting the DTC

B2425 04 or B2430 04

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

B2425 0A or B2430 0A

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

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

By measuring output current, the HSM 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 HSM 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.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 508

4. Test for 2.0 - 8.0 Ohms between control circuit terminal 14 and control circuit terminal 11.

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.

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

6. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 1 X5 and the low reference circuit terminal 3 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.

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

8. Disconnect the harness connector at the seat cushion 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.

B2430 0A, B2430 0B, B2430 0C, B2430 0D, B2430 0E, B2430 04, or B2430 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, X4 harness connectors 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 2.0 - 8.0 Ohms between control circuit terminal 6 X1 and control circuit terminal 14 X4.

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.

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

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

7. Connect the X1, X2, X4, X5 harness connectors at the MSM.

8. Disconnect the harness connector at the seat cushion 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 greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. 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 Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 168

and the sector switch will be active during the power cinch function. Each of the latch switch signal circuits are supplied battery voltage through a

resistor and monitored within the LGM. The latch switches share a common low reference circuit from the LGM and when the switch contacts close

the signal circuit goes low and the LGM determines the switch to be active. The full open switch is a limit switch mounted on the gear motor

assembly alongside the swing arm gear. The full open switch signal circuit is supplied battery voltage through a resistor and monitored within the

LGM. When the liftgate reaches the full open position, the switch signal circuit is closed to the low reference circuit and the signal circuit voltage

goes low.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

B153A 00

The LGM detects a fault in any of the following switch signal circuits:

* Ratchet switch

* Pawl switch

* Sector switch

B153A 08

When the LGM detects a loss of B+ voltage, an open/high resistance in the sensor signal circuit, an open/high resistance in the liftgate latch low

reference circuit, or any incorrect combination of signals from the following switch inputs:

* Ratchet switch

* Pawl switch

* Sector switch

Action Taken When the DTC Sets

* Power open will be disabled.

* The latch may be inoperative or not function normally.

Conditions for Clearing the DTC

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

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

* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

DTC B153A may be set when the vehicle is driven while the liftgate is open, as when the owner transports a large package in the rear of the vehicle.

The DTC will become history after the liftgate is closed and does not affect normal liftgate operation.

Note: 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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 619

* 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 B2870 01

- Tilt Up Switch Circuit Short to Battery

DTC B2875 01

- Tilt Down Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit Description

The memory seat module (MSM) receives voltage inputs from the tilt switch based on the position of the switch. The MSM then supplies battery

voltage and a ground to the tilt motor control circuits depending on which direction of movement is requested.

Conditions for Running the DTC

The ignition ON.

Conditions for Setting the DTC

The MSM detects a tilt switch input for more than 30 consecutive seconds after the tilt motor movement has stopped.

Action Taken When the DTC Sets

* The tilt motor will be deactivated.

* Memory recall functions will be disabled.

Conditions for Clearing the DTC

* A current DTC will clear when the failed switch input is no longer active.

* A history DTC will clear after 100 ignition cycles.

Diagnostic Aids

An intermittently stuck tilt switch may cause a DTC to set.

Reference Information

Schematic Reference

Steering Wheel Schematics (See: Diagrams/Electrical Diagrams/Steering/Steering Column/Steering Wheel Schematics)

Connector End View Reference

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

Description and Operation

Steering Wheel and Column Description and Operation (See: Steering and Suspension/Steering/Steering Column/Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 177

* 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

DTC B0514 05

- Output Air Temperature Sensor 4 Circuit Short to Battery or Open

DTC B3578 02

- Output Air Temperature Sensor 6 Circuit Short to Ground

DTC B3578 05

- Output Air Temperature Sensor 6 Circuit Short to Battery or Open

DTC B3583 02

- Output Air Temperature Sensor 7 Circuit Short to Ground

DTC B3583 05

- Output Air Temperature Sensor 7 Circuit Short to Battery or Open

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 332

DTC B1055 02

- Audio Output 4 Right Rear Circuit Short to Ground

DTC B1055 04

- Audio Output 4 Right Rear Circuit Open

DTC B1065 01

- Audio Output 5 Circuit Short to Battery (Center IP)

DTC B1065 02

- Audio Output 5 Circuit Short to Ground (Center IP)

DTC B1065 04

- Audio Output 5 Circuit Open (Center IP)

DTC B1075 01

- Audio Output 6 Circuit Short to Battery (Subwoofer)

DTC B1075 02

- Audio Output 6 Circuit Short to Ground (Subwoofer)

DTC B1075 04

- 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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 405

The voltage of the high resolution B+ circuit is greater than 16 volts for 15 seconds.

B1517 5A

The voltage of the high resolution B+ circuit is 2 volts less than the voltage of the BCM B+ circuit for 10 seconds.

Action Taken When the DTC Sets

* The instrument panel cluster (IPC) illuminates the charge indicator.

* The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM message.

Conditions for Clearing the DTC

* The DTC will pass when the battery voltage is in the normal range for 15 seconds.

* The history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction.

Diagnostic Aids

* A high or low voltage DTC in multiple modules indicates a concern in the charging system. Refer to Charging System Test (See: Starting and

Charging/Testing and Inspection/Component Tests and General Diagnostics/Charging System Test).

* Verify that the ground connections G103 and G201 are clean and tight.

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)

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

Diagram/Ground Distribution Schematics)

Connector End View Reference

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

Description and Operation

Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and

15.0 volts.

锟斤拷 If not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests and

General Diagnostics/Charging System Test).

2. Observe the scan tool BCM Battery Voltage parameter and the Batt. Voltage High Res. parameter. Both readings should be between 12.60

and 15.00 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the BCM.

2. Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the following

ground circuit terminals and ground:

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 641

Circuit/System Verification

Command the Lock Rear Doors and Unlock Rear Doors with a scan tool, the rear doors should perform the LOCK and UNLOCK function.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the I/P fuse block.

2. Connect a test lamp between the control circuit terminal A2 and ground.

3. Ignition ON, command the Lock Rear Doors with a scan tool. The test lamp should briefly illuminate during the LOCK command.

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.

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.

4. Connect a test lamp between the control circuit terminal A3 and B+.

5. Command the Unlock Rear Doors with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.

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

the BCM.

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

6. If all circuits test normal, replace the I/P fuse block.

Repair Instructions

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

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

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

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

B3205

DTC B3205

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 B3205 00

- Window Inactive Over Current Fault

DTC B3205 0B

- Window Motor Fast Over Current Fault

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 154

* Left rear side impact sensor terminal A

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

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

* Right front end sensor terminal 1

* Left front end sensor terminal 1

* Right front side impact sensor terminal B

* Left front side impact sensor terminal B

* Right rear side impact sensor terminal B

* Left rear side impact sensor terminal B

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

6. Test for less than 1 ohm between the following signal circuit terminals.

* Right front end sensor terminal 1 and SDM terminal 37.

* Left front end sensor terminal 1 and SDM terminal 36.

* Right front side impact sensor terminal B and the SDM terminal 43.

* Left front side impact sensor terminal B and the SDM terminal 42.

* Right rear side impact sensor terminal B and the SDM terminal 45.

* Left rear side impact sensor terminal B and the SDM terminal 44.

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

7. Test for less then 1 ohm between the following front end sensor low reference circuit terminals.

* Right front end sensor terminal 2 and SDM terminal 39.

* Left front end sensor terminal 2 and SDM terminal 38.

* Right front side impact sensor terminal A and the SDM terminal 41.

* Left front side impact sensor terminal A and the SDM terminal 40.

* Right rear side impact sensor terminal A and the SDM terminal 47.

* Left rear side impact sensor terminal A and the SDM terminal 46.

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

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

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

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

Repair Instructions

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

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

Repair/Inflatable Restraint Front End Sensor Replacement)

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

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

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

Side Impact Sensor Replacement (Rear Side Door))

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

Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)

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

B0091

DTC B0091

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.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 663

DTC B3604 or B3605

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 B3604 01

- Adjustable Foot Pedal Forward Switch Circuit Short to Battery

DTC B3605 01

- Adjustable Foot Pedal Rearward Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit/System Description

The adjustable pedals forward and rearward switches are inputs to the memory seat module (MSM). The MSM supplies the switch assembly with a

battery positive reference voltage. When the switch is operated to the forward or rearward direction, battery positive voltage is applied to the forward

or rearward switch signal inputs.

Conditions for Running the DTC

System voltage is 9-16 volts.

Conditions for Setting the DTC

The forward and rearward switch signal circuits are active at the same time.

Action Taken When the DTC Sets

The adjustable pedals will be disabled.

Conditions for Clearing the DTC

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

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

Reference Information

Schematic Reference

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

Adjustable Pedals Description and Operation (with Memory) (See: Accessories and Optional Equipment/Pedal Positioning System/Description and

Operation/Adjustable Pedals Description and Operation (with Memory))Adjustable Pedals Description and Operation (w/o Memory) (See:

Accessories and Optional Equipment/Pedal Positioning System/Description and Operation/Adjustable Pedals Description and Operation (w/o

Memory))

Electrical Information Reference

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 164

Diagnostic Fault Information

Circuit/System Description

Modules connected to the high and low speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation.

Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are

needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used

by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter

module.

The wake up signal circuit is energized by the serial data gateway (SDG) module to activate the drive motor generator power inverter module (PIM)

and the drive motor generator battery control module. If the wake up signal is not responded to by all three modules, this DTC sets in the SDG

module.

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

A short circuit exists on the wake up signal circuit of the SDG module.

Action Taken When the DTC Sets

The malfunction indicator lamp (MIL) illuminates and the driver information center (DIC) displays the message Service Hybrid System.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information

Schematic Reference

* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical

Diagrams)

* Hybrid Controls Schematics ()

Connector End View Reference

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

Description and Operation

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

Bus/Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Special Tools

* EL-48569 Terminal Covers

* EL-48900 HEV Safety Kit

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 545

Conditions for Setting the DTC

* The navigation radio tests the navigation display backlighting every 1 second.

* The radio determines there is a malfunction or overheat condition in the navigation display backlighting.

Action Taken When the DTC Sets

Navigation backlighting may be too bright, dim or blank.

Conditions for Clearing the DTC

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

* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

Occasionally it is possible to overheat the navigation display backlighting due to excessive ambient heat inside the vehicle. In this instance it may be

necessary to allow time for the display to cool.

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

Navigation System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Navigation System

Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

1. Ignition OFF, allow the navigation display to cool if the ambient temperature inside the vehicle is excessive and the radio is hot to the touch.

Verify the navigation display is cool and the DTC has cleared and gone to history.

2. Ignition ON, with a scan tool, clear all DTCs and operate the audio/navigation system within the Conditions for Running the DTC. Verify the

DTC does not reset.

锟斤拷 If the DTC resets, replace the radio.

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 Radio replacement, setup, and programming

B2476

DTC B2476 or B2482

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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 607

* 2WD HI

* AWD/4WD Auto

* 4WD HI

* 4WD LO

* Neutral

Conditions for Running the DTC

* Ignition ON.

* System voltage 10.5-18 V.

Conditions for Setting the DTC

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

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

Action Taken When the DTC Sets

* All shifting is disabled.

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

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

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

Reference Information

Schematic Reference

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

Case)

Connector End View Reference

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Special Tools

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

* J 35616 - GM-Approved Terminal Test Kit

Circuit/System Verification

1. Key ON, engine OFF.

2. Connect a scan tool.

3. Verify that all mode selections of the transfer case shift control switch (TCSCS) match the following parameters in the Data Display feature of

the scan tool:

* Mode Switch Selected

* Transfer Case Position

* The corresponding Mode Indicator Light

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 45

Diagnostic Aids

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

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

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

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Special Tools Required

J 38715-A Driver and Passenger SIR Load Tool

Circuit/System Verification

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

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

the affected component/connector.

* Seat belt pretensioner

* Passenger instrument panel airbag

* Side air bag

* Roof rail airbag

* SDM

* SDM wiring harness connector

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

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

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

high resistance condition due to terminal fretting corrosion.

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

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

* Passenger instrument panel air bag

* Roof rail air bag

* Seat side air bag

* Seat belt pretensioner

* Any inline harness

* SDM

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

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

* Apply Nyogel lubricant 760G to each connector terminal.

* Insure each connector and CPA is correctly seated.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 478

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

B1935 0B, B1935 0E, B2180 0B, or B2180 0E

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

B1935 0C, B1935 0D, B2180 0C, or B2180 0D

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

B1935 1F or B2180 1F

The temperature sensor voltage is erratic or changes suddenly.

Action Taken When the DTC Sets

The heated seat back 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 Testing

B1935 0A, B1935 0B, B1935 0C, B1935 0D, B1935 0E, B1935 04, or B1935 1F

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

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 3.5 - 11.5 Ohms between control circuit terminal 3 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.

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

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

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

back heater element/temperature sensor.

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

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

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

B320A 39

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

B320A 42

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

B320A 4B

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

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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

Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

B320A 39

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

commanded.

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

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

B320A 42

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

does not reset.

If the DTC resets, replace the power window motor.

B320A 4B

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

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

If the DTC resets, replace the power window motor.

Repair Instructions

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

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

Regulator Motor Replacement)

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

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

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

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

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

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

B2425 1F or B2430 1F

The temperature sensor voltage is erratic or changes suddenly.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

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

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

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics ()

Connector End View Reference

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

Description and Operation

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

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

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

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

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

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

Circuit/System Testing

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

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

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

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

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

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

unoccupied, then with the seat occupied.

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

Circuit/System Description

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

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

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

Conditions for Running the DTC

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

Conditions for Setting the DTC

B1335 00

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

B1335 0B

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

B1335 42

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

B1335 4B

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

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

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

B3823 00

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

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

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

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

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

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

Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

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

window should perform UP and DOWN function.

Circuit/System Testing

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

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

window switch on the driver master control.

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

BCM.

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

window switch on the driver master control.

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

BCM.

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

Repair Instructions

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

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

Replacement)

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

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

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

Connector End View Reference

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

Description and Operation

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

Temperature Description and Operation)Air Temperature Description and Operation

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

Description and Operation)Air Delivery Description and Operation

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

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

circuit terminal 3 and ground.

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

replace the HVAC Control Module.

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

Control Module.

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

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

3. With a scan tool, clear the DTC.

4. Ignition OFF.

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

锟斤拷 If DTC B1023 sets, replace the module.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning)Control Module References for control module

replacement, setup, and programming

B1024

DTC B1024

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provides an overview of each diagnostic category.

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

DTC B1000 12

- Electronic Control Unit (ECU) Performance Below Minimum Threshold

DTC B1000 31

- Electronic Control Unit (ECU) General Checksum Problem

DTC B1000 32

- Electronic Control Unit (ECU) General Memory Failure

DTC B1000 33

- Electronic Control Unit (ECU) Performance Special Memory Failure

DTC B1000 34

- Electronic Control Unit (ECU) Performance RAM Integrity

DTC B1000 35

- Electronic Control Unit (ECU) Performance ROM Integrity

DTC B1000 36

- Electronic Control Unit (ECU) Performance EEPROM Integrity

DTC B1000 37

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

DTC B1000 38

- Electronic Control Unit (ECU) Performance Supervision Software Failure

DTC B1000 39

- Electronic Control Unit (ECU) Performance Internal Electronic Failure

DTC B1000 43

- Electronic Control Unit (ECU) Performance EEPROM Error

DTC B1000 46

- Side Object Detection Performance - Invalid Configuration

DTC B1000 56

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

DTC B1000 57

- Electronic Control Unit (ECU) Performance

DTC B1000 73

- Electronic Control Unit (ECU) Performance Parity Error

DTC B1000 0F

- Electronic Control Unit (ECU) Performance Erratic

DTC B1000 2B

- Electronic Control Unit (ECU) Performance Missing Reference

DTC B1000 2C

- Electronic Control Unit Performance Reserved

DTC B1000 3B

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

DTC B1000 3C

- Electronic Control Unit (ECU) Performance Internal Communications Failure

DTC B1000 4A

- Side Object Detection Performance - PROM Checksum Error

DTC B1000 F0

- Side Object Detection RF Transmit Chain Failed

DTC B1000 F1

- Side Object Detection RF Receive Chain Failed