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. Testing and Inspection

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 indicator.

Reference Information
Schematic Reference
Brake Warning System Schematics

Connector End View Reference
Computer/Integrating Systems Connector End Views

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 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 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

Important: Always 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