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Brake Warning Indicator Always On

  1. Did you perform the DIAGNOSTIC SYSTEM CHECK? If so, go to next step. If not, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Inspect the brake fluid level. Is the brake fluid level okay? If so, go to next step. If not, go to BLEEDING, FILLING & FLUSHING BRAKE SYSTEM  .
  3. Turn ON the ignition, with the engine OFF. Release the park brake. With a scan tool, observe the PARK BRAKE SWITCH parameter in the INSTRUMENT PANEL CLUSTER data list. Does the scan tool indicate that the PARK BRAKE SWITCH parameter is OFF? If so, go to next step. If not, go to step  5 .
  4. With a scan tool, observe the BRAKE FLUID LEVEL parameter in the DRP/ABS/TCS/VSES data list. Does the scan tool indicate that the BRAKE FLUID LEVEL parameter is okay? If so, go to INTERMITTENT  in SYMPTOMS - HYDRAULIC BRAKE. If not, go to step  6 .
  5. Turn OFF the ignition. Disconnect the park brake switch. Turn ON the ignition, with the engine OFF. With a scan tool, observe the PARK BRAKE SWITCH parameter. Does the scan tool indicate that the PARK BRAKE SWITCH parameter is OFF? If so go to step  9 . If not, go to step  7 .
  6. Turn OFF the ignition. Disconnect the brake fluid level switch. Turn ON the ignition, with the engine OFF. With a scan tool, observe the BRAKE FLUID LEVEL parameter. Does the scan tool indicate that the BRAKE FLUID LEVEL parameter is okay? If so, go to step  10 . If not, go to step  8 .
  7. Test the signal circuit of the park brake switch for a short to ground. Did you find and correct the condition? If so, go to step  15 . If not, go to step  11 .
  8. 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  15 . If not, go to step  11 .
  9. Inspect for poor connections at the harness connector of the park brake switch. See INTERMITTENT  in SYMPTOMS - HYDRAULIC BRAKE. Did you find and correct the condition? If so, go to step  15 . If not, go to step  12 .
  10. Inspect for poor connections at the harness connector of the brake fluid level switch. See INTERMITTENT  in SYMPTOMS - HYDRAULIC BRAKE. Did you find and correct the condition? If so, go to step  15 . If not, go to step  13 .
  11. Inspect for poor connections at the harness connector of the Instrument Panel Cluster (IPC). See INTERMITTENT  in SYMPTOMS - HYDRAULIC BRAKE. Did you find and correct the condition? If so, go to step  15 . If not, go to step  14
  12. Replace the park brake switch. See PARK BRAKE WARNING LAMP SWITCH  under REMOVAL & INSTALLATION. After repairs are complete, go to step  15 .
  13. Replace the brake fluid level switch. See MASTER CYLINDER FLUID LEVEL SENSOR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  15 .
  14. Replace the IPC. See appropriate GAUGES & INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to next step.
  15. Operate the vehicle in order to verify the repair. Did you correct the condition? If so, system is okay. If system is not okay, go to  2 .
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