2010 Cadillac Truck SRX FWD V6-3.0L Page 761

2010 Cadillac Truck SRX FWD V6-3.0L Page 761

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

Circuit/System Verification

Verify that DTC C028A is not set.

If DTC is set, program the parking brake control module. If the DTC resets, replace the K83 Parking Brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for parking brake control module replacement, setup, and

programming.

C028B

DTC C028B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC C028B 08

- Park Brake Motor Position Sensor Signal Performance-Signal Invalid

DTC C028B 26

- Park Brake Motor Position Sensor Signal Low Frequency

DTC C028B 29

- Park Brake Motor Position Sensor Signal Too Few Pulses

DTC C028B 2A

- Park Brake Motor Position Sensor Signal Too Many Pulses

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 also contains an internal park brake motor position sensor which

monitors the park brake motor position.

The Park Brake Motor Position Sensor is an internal sensor to the park brake control module, this sensor is used to monitor the park brake motor

position.

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The parking brake control module detects an internal motor position sensor signal malfunction.

Action Taken When the DTC Sets

* The electric parking brake is disabled, one release allowed.

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

Conditions for Clearing the DTC