2010 Cadillac Truck Escalade AWD V8-6.2L Page 1022
锟斤拷If 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.
锟斤拷If 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.
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 fuel pump/trailer brake control module.
7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.
锟斤拷If 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.
锟斤拷If 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.
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 fuel pump/trailer brake control 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 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
