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Brake Warning Indicator Always On

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review the hydraulic brakes operation and perform the necessary inspection? If so, go to next step. If not, go to GENERAL DIAGNOSIS  under TROUBLE SHOOTING.
  2. Inspect the brake fluid level. Is the brake fluid level okay? If so, go to next step. If not, go to BRAKE FLUID LOSS .
  3. Turn ON the ignition, with the engine OFF. Disengage the park brake. With a scan tool, observe the Park Brake Switch parameter in the BCM Inputs data list. Does the scan tool indicate that the Park Brake Switch parameter is Inactive? If so, go to next step. If not, go to step  5.
  4. With a scan tool, observe the Brake Warning Lamp parameter in the IPC Inputs data list. Does the scan tool indicate that the Brake Warning Lamp parameter is ON? If so, go to step  12. If not, go to step  6.
  5. Disconnect the park brake warning lamp switch. With a scan tool, observe the Park Brake Switch parameter. Does the scan tool indicate that the Park Brake Switch parameter is Inactive? If so, go to step  9. If not, go to step  7.
  6. Disconnect the brake fluid level switch. With a scan tool, observe the Brake Warning Lamp parameter. Does the scan tool indicate that the Brake Warning Lamp parameter is ON? If so, go to step  10. If not, go to step  8.
  7. Turn OFF the ignition. Test the signal circuit of the park brake warning lamp switch for a short to ground. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. See INSTRUMENT CLUSTER in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If so, go to step  17. If not, the go to step  11.
  8. Turn OFF the ignition. Test the signal circuit of the brake fluid level switch for a short to ground. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. See ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If so, go to step  17. If not, go to step  11.
  9. Inspect for poor connections at the harness connector of the park brake warning lamp switch. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. See INSTRUMENT CLUSTER in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If so, go to step  17. If not, go to step  13.
  10. Inspect for poor connections at the harness connector of the brake fluid level switch. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. See ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If so, go to step  17. If not, go to step  14.
  11. Inspect for poor connections at the harness connector of the Body Control Module. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. Did you find and correct the condition? If so, go to step  17. If not, go to step  15.
  12. Inspect for poor connections at the harness connector of the instrument Panel cluster. See INTERMITTENT  under GENERAL DIAGNOSIS in TROUBLE SHOOTING. Did you find and correct the condition? If so, go to step  17. If not, go to step  16.
  13. Replace the park brake warning lamp switch. See PARK BRAKE WARNING LAMP SWITCH  under REMOVAL & INSTALLATION. After repairs are complete, go to step  17.
  14. Replace the brake fluid level switch. See MASTER CYLINDER FLUID LEVEL SENSOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  17.
  15. Replace the Body Control Module. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  17.
  16. Replace the Instrument Panel Cluster (IPC). See REMOVAL & INSTALLATION in appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to next step.
  17. Operate the system in order to verify the repair. Did you correct the condition? If so, the system should be okay. If not, go to step  2.
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