Brake Warning Indicator Always On

Brake Warning Indicator Always On

Diagnostic Fault Information

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 signal grounded, it sends a serial data message to the instrument panel cluster (IPC) requesting illumination of the Red Brake Warning indicator.

Reference Information

Schematic Reference

CELL LINK

Connector End View Reference

CELL LINK

Electrical Information Reference

^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel lamps OFF. Verify the Red Brake Warning indicator turns OFF.
^ If the Red Brake Warning indicator does not turn OFF, replace the IPC.

2. Disconnect the park brake switch. With a scan tool, observe the Park Brake Switch parameter. Verify parameter is reading ON.
^ If the parameter is OFF, replace the park brake switch.

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

4. Replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

^ Park Brake Warning Lamp Switch Replacement
^ Control Module References for IPC replacement, setup, and programming