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Brake Warning Indicator Always On

  1. If the hydraulic brakes operation has been reviewed and the necessary inspection performed, go to step  2. If the hydraulic brakes operation has not been reviewed and the necessary inspection has not been performed, see HYDRAULIC BRAKE SYSTEM  under GENERAL DIAGNOSIS in TROUBLE SHOOTING.
  2. Inspect the brake fluid level. If the brake fluid level is okay, go to step  3. If the brake fluid level is not okay, see BRAKE FLUID LOSS .
    1. Turn ON the ignition, with the engine OFF.
    2. Disengage the park brake.
    3. With a scan tool, observe the park brake switch parameter in the BCM Inputs data list.
    If the scan tool indicates that the park brake switch parameter is inactive, go to step  4. If the scan tool does not indicate that the park brake switch parameter is inactive, go to step  5.
  4. With a scan tool, observe the brake warning light parameter in the Instrument Panel Cluster (IPC) inputs data list. If the scan tool indicates that the brake warning light parameter is on, go to step  12. If the scan tool does not indicate that the brake warning light parameter is on, go to step  6.
  5. Disconnect the park brake warning light switch. With a scan tool, observe the park brake switch parameter. If the scan tool indicates that the park brake switch parameter is inactive, go to step  9. If the scan tool indicates that the park brake switch parameter is inactive, go to step  7.
  6. Disconnect the brake fluid level switch. With a scan tool, observe the brake warning light parameter. If the scan tool indicates that the brake warning light parameter is on, go to step  10. If the scan tool does not indicate that the brake warning light parameter is on, go to step  8.
  7. Turn OFF the ignition. Test the signal circuit of the park brake warning light switch for a short to ground. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  11.
  8. Turn OFF the ignition. Test the signal circuit of the brake fluid level switch for a short to ground. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  11.
  9. Inspect for poor connections at the harness connector of the park brake warning light switch. If the condition was not found and corrected, go to step  17. If the condition was not found and corrected, go to step  13.
  10. Inspect for poor connections at the harness connector of the brake fluid level switch. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  14.
  11. Inspect for poor connections at the harness connector of the BCM. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  15.
  12. Inspect for poor connections at the harness connector of the instrument Panel cluster. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  16.
  13. Replace the park brake warning light switch. See PARK BRAKE WARNING LIGHT SWITCH  under REMOVAL & INSTALLATION. If the repair was completed, go to step  17.
  14. Replace the brake fluid level switch. See MASTER CYLINDER FLUID LEVEL SENSOR  under REMOVAL & INSTALLATION. If the repair was completed, go to step  17.
  15. Replace the Body Control Module. See appropriate BODY CONTROL MODULE article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  17.
  16. Replace the IPC. If the repair was completed, go to step  17.
  17. Operate the system in order to verify the repair. If the condition was corrected, system okay. If the condition was not corrected, go to step  2.
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