2010 Cadillac CTS Sedan AWD V6-3.6L Page 674
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 electric parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The electric parking brake
control module also contains the logic for applying and releasing the parking brake when commanded by the electric parking brake switch. When
the electric 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 electric 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 electric parking brake module detects an internal hardware malfunction.
Action Taken When the DTC Sets
* The electric parking brake is disabled.
* A DIC message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The electric parking brake 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 electric parking brake 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)
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/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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.
瀚慖f DTC is set, perform the Electronic Parking Brake Control Module Programming and Setup (See: Brakes and Traction Control/Parking
Brake System/Parking Brake Control Module/Testing and Inspection).
