Service Information

Captiva

DTC C028A

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provide an overview of each diagnostic category.

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 handbrake control module also contains the logic for applying and releasing the handbrake when commanded by the handbrake 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 handbrake control module will also diagnose the internal handbrake 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 handbrake will self diagnose the internal Handbrake Motor Circuit. This circuit is used to drive the motor, which pulls on the handbrake cable, ultimately applying and releasing the handbrake.

Conditions for Running the DTC

•	Ignition OFF, ACCESSORY, or RUN mode.

•	Battery voltage is between 9 -16V

Conditions for Setting the DTC

The handbrake control module detects an internal motor malfunction.

Action Taken When the DTC Sets

•	The electric handbrake is disabled.

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

Conditions for Clearing the DTC

•	The handbrake 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

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that DTC C028A is not set.

⇒	If DTC is set, program the handbrake control module. If the DTC resets, replace the K83 Handbrake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification

•	Electronic Parking Brake Control Module Replacement

•	Control Module References