2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1054

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1054

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the solid state relay.

3. Test for less than 5 ohm between the ground circuit terminal B and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal F and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the

STUD 2 fuse is open, replace the trailer brake control relay.

5. Ignition ON, verify that a test lamp does not illuminate between control circuit terminal E and ground.

瀚慖f test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the trailer brake control module.

6. Ignition ON, verify that a test lamp does not illuminate between control circuit terminal E and B+.

瀚慖f test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the 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 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 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 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 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 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))

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

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

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

Gasoline Without LY6

DTC C0870, C1112, C1113, C1114, or C1119 (Gasoline Without LY6)

Diagnostic Instructions

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