2010 Cadillac Truck SRX FWD V6-3.0L Page 760
DTC C028A 01
- Park Brake Motor Circuit Short to Battery
DTC C028A 02
- Park Brake Motor Circuit Short to Ground
DTC C028A 04
- Park Brake Motor Circuit Open Circuit
DTC C028A 08
- Park Brake Motor Circuit Performance-Signal Invalid
DTC C028A 28
- Park Brake Motor Circuit Performance-Incorrect Frequency
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 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 control module will also diagnose the internal park brake motor circuit to verify it is
functioning properly. The park brake motor circuit is used to command motor operation, apply and release tension on the parking brake cable,
which will apply and release the parking brake.
The park brake will self diagnose the internal Park Brake Motor Circuit. This circuit is used to drive the motor, which pulls on the park brake cable,
ultimately applying and releasing the park brake.
Conditions for Running the DTC
* Ignition OFF, ACCESSORY, or RUN mode.
* Battery voltage is between 9 -16V
Conditions for Setting the DTC
The parking brake control module detects an internal motor 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.
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)
