2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1022

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1022

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

瀚慖f 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 fuel pump/trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater 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 fuel pump/trailer brake control module.

9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground.

瀚慖f 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 fuel pump/trailer brake control module.

瀚慖f greater than the specified range, test the signal 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, test or replace the trailer brake controller switch panel.

Repair Instructions

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

* Trailer Brake Control Switch Replacement (See: Accessories and Optional Equipment/Towing / Trailer System/Trailer Brake Control

Module/Service and Repair/Trailer Brake Control Switch Replacement)

* 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 C0880, C0890, C1115, C1116, C1117, or C1118 (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 Descriptor

DTC C0880 00

- Device Voltage Reference Output 2 Circuit

DTC C0890 00

- Device Voltage Reference Output 3 Circuit

DTC C1115 08

- Manual Trailer Brake Apply Request Switch Signal Invalid

DTC C1115 5A

- Manual Trailer Brake Apply Request Switch Signal Plausibility Failure