Brake Warning Light Remains On With Ignition On & Parking Brake Released
- Disconnect parking brake warning switch connector. If brake warning light remains on, go to next step. If brake warning light does not remain on, replace parking brake warning switch.
- Disconnect brake pressure warning switch connector (Brake Pressure Modulator Valve (BPMV) front connector). BPMV is located in engine compartment, on left inner fender panel and connector is on front side of BPMV. If brake pressure warning light remains on, go to next step. If brake pressure warning light does not remain on, replace brake pressure warning switch.
- Disconnect 48-pin connector between ignition switch and parking brake warning switch. Check continuity between terminals B5 (Tan/White wire) and B2 (Black wire). If no continuity is present, reconnect connector and go to next step. If continuity is present, replace ignition switch.
- Disconnect brake pressure modulator valve 10-pin connector. If brake warning light remains on, check Purple or Tan/White wires for a short to ground. If wires are okay, replace instrument cluster. If brake warning light does not remain on, diagnose brake system. See ANTI-LOCK BRAKE SYSTEM article in BRAKES section.