2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 712

- Group 1 Seat Motors Common Circuit Short to Battery

DTC B3920 02

- Group 1 Seat Motors Common Circuit Short to Ground

DTC B3921 01

- Group 2 Seat Motors Common Circuit Short to Battery

DTC B3921 02

- Group 2 Seat Motors Common Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The memory seat module (MSM) controls the driver seat, adjustable pedal, and tilt steering wheel motors via half bridges that are divided into 2

groups that are connected to separate power rails internal to the module. The MSM connects all of the motor control circuits to a common reference

point whenever they are not in operation. This reference point is biased to approximately 2.5 V. The MSM checks to see if this reference voltage is

shorted to ground or battery before enabling any seat, adjustable pedal, or steering wheel motor.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 404

Repair)

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

B1517

DTC B1517

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 B1517 03

- Battery Voltage Below Threshold - BCM

DTC B1517 07

- Battery Voltage Above Threshold - BCM

DTC B1517 5A

- Battery Voltage Plausibility Failure - BCM

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The body control module (BCM) has 2 circuits for monitoring vehicle system voltage. The BCM B+ is supplied to terminal 3 X3 by the BCM fuse,

and the high resolution B+ is supplied to the BCM terminal 10 X4 by the IPC fuse. The BCM monitors the system voltage on both circuits to ensure

that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the BCM

detects the system voltage on the high resolution B+ circuit is outside the normal range, DTC B1517 will set.

Conditions for Running the DTC

The BCM is awake.

Conditions for Setting the DTC

B1517 03

The voltage of the high resolution B+ circuit is less than 11 volts for 2 minutes.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 139

- RF Side Impact Sensor Invalid Serial Data Received

DTC B0087 00

- LR Side Impact Sensor No Additional Information

DTC B0087 0F

- LR Side Impact Sensor Erratic

DTC B0087 39

- LR Side Impact Sensor Internal Electronic Failure

DTC B0087 3A

- LR Side Impact Sensor Incorrect Component Installed

DTC B0087 71

- LR Side Impact Sensor Invalid Serial Data Received

DTC B0088 00

- RR Side Impact Sensor No Additional Information

DTC B0088 0F

- RR Side Impact Sensor Erratic

DTC B0088 39

- RR Side Impact Sensor Internal Electronic Failure

DTC B0088 3A

- RR Side Impact Sensor Incorrect Component Installed

DTC B0088 71

- RR Side Impact Sensor Invalid Serial Data Received

Diagnostic Fault Information

Circuit/System Description

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

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

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

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

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

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

the SDM will set a DTC.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

Any of the following conditions exist for 2.5 seconds:

B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 424

- 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

Circuit Description

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

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

Conditions for Running the DTC

The memory seat module must be powered.

Conditions for Setting the DTC

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

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

Action Taken When the DTC Sets

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

* All memory recall commands are ignored.

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

Conditions for Clearing the DTC

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

to ACC or RUN.

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

Reference Information

Schematic Reference

Driver Seat Schematics ()

Connector End View Reference

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 608

Circuit/System Testing

1. Key OFF. Disconnect the X1 connector at the transfer case shift control switch (TCSCS). Install EL-49742 - harness.

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

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

2. Key ON (Ignition C), engine OFF.

3. Using the L-BU probes J 35616-64B, test for 4.86-5.25 V between the 5-volt reference circuit, TCSCS X1 pin 11, and the ground terminal of

EL-49742 - harness, black terminal.

锟斤拷 If the voltage is less than the specified value, test the 5-volt reference circuit for an open/high resistance or short to ground condition. If all

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

锟斤拷 If the voltage is greater than the specified value, test the 5-volt reference circuit for a short to voltage. If all circuits and connections test

normal, test the TCCM for proper operation.

4. Using the L-BU probes J 35616-64B, test for 4.86-5.25 V between the 5-volt reference circuit, TCSCS X1 pin 11, and the switch signal circuit

TCSCS X1 pin 12.

锟斤拷 If the voltage is less than the specified value, test the switch signal circuit for an open/high resistance, short to ground or short together. If

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

锟斤拷 If the voltage is greater than the specified value, test the switch signal circuit for a short to voltage. If all circuits and connections test

normal, test the TCCM for proper operation.

5. Using the L-BU probes J 35616-64B, test for greater than 500 ohm between the 5-volt reference circuit, TCSCS X1 pin 11, and all other pins

of the TCSCS X1.

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

normal, test the TCCM for proper operation.

6. Using the L-BU probes J 35616-64B, test for greater than 500 ohm between the switch signal circuit TCSCS X1 pin 12, and all other pins of

the TCSCS X1.

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

normal, test the TCCM for proper operation.

7. Test the TCSCS for proper operation.

Component Testing

TCSCS - Mode Switch Circuit

1. Key OFF. Remove the TCSCS.

2. Using the L-BU probes J 35616-65, measure the resistance for each of the mode positions of the TCSCS between the 5-volt reference circuit,

TCSCS X1 pin 11, and the switch signal circuit TCSCS X1 pin 12.

锟斤拷 If the resistance is outside the specified ranges, replace the TCSCS.

3. Test the TCCM for proper operation.

TCCM - Mode Switch Circuit

1. Key ON, engine OFF. Install the TCSCS.

2. Using the Data Display feature of the scan tool, monitor the Mode Switch Supply and Return Voltages while turning the TCSCS through each

mode.

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

circuits and connections test normal, reprogram the TCCM. If the DTC resets replace the TCCM.

锟斤拷 If the voltage is greater than the specified value, test the affected circuit for a short to voltage. If all circuits and connections test normal,

reprogram the TCCM. If the DTC resets replace the TCCM.

3. Perform the Circuit/System Testing.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 23

DTC B0014 0E

- Driver Side Seat Air Bag Deployment Loop Resistance Below Threshold

DTC B0015 01

- Driver Seat Belt Retractor Pretensioner Deployment Loop Short to Battery

DTC B0015 02

- Driver Seat Belt Retractor Pretensioner Deployment Loop Short to Ground

DTC B0015 04

- Driver Seat Belt Retractor Pretensioner Deployment Loop Open Circuit

DTC B0015 0D

- Driver Seat Belt Retractor Pretensioner Deployment Loop Resistance Above Threshold

DTC B0015 0E

- Driver Seat Belt Retractor Pretensioner Deployment Loop Resistance Below Threshold

DTC B0016 01

- Left Roof Rail Air Bag Deployment Loop Short to Battery

DTC B0016 02

- Left Roof Rail Air Bag Deployment Loop Short to Ground

DTC B0016 04

- Left Roof Rail Air Bag Deployment Loop Open Circuit

DTC B0016 0D

- Left Roof Rail Air Bag Deployment Loop Resistance Above Threshold

DTC B0016 0E

- Left Roof Rail Air Bag Deployment Loop Resistance Below Threshold

DTC B0019 01

- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Short to Battery

DTC B0019 02

- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Short to Ground

DTC B0019 04

- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Open Circuit

DTC B0019 0D

- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Resistance Above Threshold

DTC B0019 0E

- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Resistance Below Threshold

DTC B0020 01

- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Battery

DTC B0020 02

- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Ground

DTC B0020 04

- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Open Circuit

DTC B0020 0D

- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Above Threshold

DTC B0020 0E

- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Below Threshold

DTC B0021 01

- Passenger Side Seat Air Bag Deployment Loop Short to Battery

DTC B0021 02

- Passenger Side Seat Air Bag Deployment Loop Short to Ground

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 343

* 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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