2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1057

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1057

瀚慖f test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the fuel pump/trailer brake control

module.

7. Ignition ON, test for 3.2-4.1 V between the control circuit terminal C and ground.

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

the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer

brake control module.

8. Ignition ON, test for 3.2-4.1 V between the control circuit terminal A and ground.

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

the fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer

brake control module.

9. Ignition ON, test for less than 1 V between the control circuit terminal D and ground.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer

brake control module.

10. If all circuits test normal, replace the trailer brake solid state relay.

Repair Instructions

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

* Trailer Brake Control Relay Replacement (1500) (See: Accessories and Optional Equipment/Towing / Trailer System/Trailer Towing

Relay/Service and Repair/Trailer Brake Control Relay Replacement (1500))Trailer Brake Control Relay Replacement (2500) (See:

Accessories and Optional Equipment/Towing / Trailer System/Trailer Towing Relay/Service and Repair/Trailer Brake Control Relay

Replacement (2500))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for fuel pump/trailer brake control module

replacement, setup, and programming

Gasoline With LY6, or Diesel

DTC C0870, C1112, C1113, C1114, or C1119 (Gasoline With LY6, or Diesel)

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 C0870 00

- Device Voltage Reference Output 1 Circuit

DTC C1112 00

- Trailer Brake Control Relay Low Control Circuit

DTC C1113 01

- Trailer Brake Control Relay High Control Circuit Short to Battery

DTC C1114 00

- Trailer Brake Control Solenoids Control Circuit

DTC C1119 00

- Trailer Brake Control Relay Feedback Circuit

Diagnostic Fault Information