Brake Warning Indicator Always On

Brake Warning Indicator Always On

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

The body control module (BCM) sees the park brake switch and brake fluid level switch input to grounded, it sends a serial data message to the instrument panel cluster (IPC) requesting illumination of the red brake indicator.


Circuit/System Testing

1. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel lamps OFF. Verify brake lamp turns OFF.
* If the brake lamp does not turn OFF, replace the IPC.

2. Disconnect the park brake switch, with a scan tool observe park brake switch parameter. Verify parameter is reading ON.
* If parameter is OFF, replace the park brake switch

3. Test the signal circuit of the park brake switch for a short to ground. Verify no short is found.
* If short is found repair circuit.

4. Replace the BCM.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Parking Brake Indicator Switch Replacement
* Refer to Programming and Relearning. Programming and Relearning