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Brake Warning Indicator Always On

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix and 2002 Oldsmobile Intrigue. 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 SYMPTOMS (HYDRAULIC BRAKE)  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. If the fuse in the jumper opens when you perform this test, the signal circuit of the brake fluid level switch is shorted to voltage. Turn off the ignition. Test the signal circuit of the park brake warning lamp switch for a short to ground. Did you find and correct the condition? If so, go to step  17 . If not, go to step  11 .
  8. Turn off the ignition. Test the signal circuit of the brake fluid level switch for a short to ground. 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. 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. 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. 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. 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 LIGHT 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 appropriate INSTRUMENT PANEL CLUSTER article in GAUGES & INSTRUMENT PANELS in ACCESSORIES. 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, system is okay. If not, go to step  2 .
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