2010 Cadillac Truck SRX FWD V6-3.0L Page 780

2010 Cadillac Truck SRX FWD V6-3.0L Page 780

DTC C056D 36

- ECU Hardware Performance EEPROM Failure

DTC C056D 37

- ECU Hardware Performance watchdog/safety uC Failure

DTC C056D 39

- ECU Hardware Performance Internal Electronic Failure

DTC C056D 3C

- ECU Hardware Performance Internal Communications Failure

Circuit/System Description

The parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The parking brake control module

also contains the logic for applying and releasing the parking brake when commanded by the park brake control switch. When the parking brake

control module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the

control module performs the requested operation. The parking brake module will perform diagnostics on the modules internal hardware to verify it

is functioning properly

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The parking brake control module detects an internal hardware malfunction.

Action Taken When the DTC Sets

* The electric parking brake is disabled.

* A message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

* The condition for the DTC is no longer present.

* The latest software and calibrations are programmed into the parking brake control module.

Reference Information

Schematic Reference

Park Brake System Schematics (See: Brakes and Traction Control/Parking Brake System/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Electronic Parking Brake Control Module Description (See: Brakes and Traction Control/Parking Brake System/Parking Brake Control

Module/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

1. Verify DTC C056D 36 is not set.