2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1079

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1079

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

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 trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the fuel

pump/trailer brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference 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 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.