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Brake Warning Indicator Always On

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review the BRAKE WARNING SYSTEM DESCRIPTION & OPERATION and perform the necessary inspections? If so, go to next step. If not, see DIAGNOSTIC STARTING POINT - HYDRAULIC BRAKE  under TROUBLE SHOOTING.
  2. Turn OFF the ignition for 5 seconds. Ensure the park brake is released. Turn ON the ignition while observing the brake warning indicator. Does the brake warning indicator illuminate for 3 seconds and then turn OFF? If so, condition is intermittent. See INTERMITTENTS  under TROUBLESHOOTING. If not, go to next step.
  3. Install a scan tool. Select the INSTRUMENT PANEL CLUSTER SPECIAL FUNCTIONS menu on the scan tool. Command the Brake Lamp OFF. Does the brake warning indicator turn OFF? If so, go to next step. If not, go to step  11 .
  4. Select INPUT 1 from the BODY CONTROL MODULE DATA DISPLAY menu on the scan tool. Ensure the park brake is released. Observe the PARK BRAKE status on the scan tool. Does the scan tool display RELEASED? If so, go to next step. If not, go to step  6 .
  5. Disconnect the brake fluid level switch harness connector. Does the brake warning indicator turn OFF? If so, go to step  12 . If not, go to step  8 .
  6. Disconnect the park brake switch harness connector. Does the brake warning indicator turn OFF? If so, go to step  9 . If not, go to next step.
  7. Disconnect the harness connector containing the park brake switch output circuit from the BCM. Test the park brake switch output circuit for a short to ground. Did you find and correct the condition? If so, go to step  14 . If not, go to step  10 .
  8. Disconnect from the EBCM, the harness connector containing the brake fluid level sensor signal circuit. Test the brake fluid level sensor signal circuit for a short to ground. Did you find and correct the condition? If so, go to step  14 . If not, go to step  13 .
  9. Replace the park brake switch. See PARK BRAKE WARNING LAMP SWITCH  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14 .
  10. Replace the BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  14 .
  11. Replace the instrument panel cluster. See appropriate GAUGES & INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs are complete, go to step  14 .
  12. Replace the brake fluid level switch. See MASTER CYLINDER RESERVOIR  under REMOVAL & INSTALLATION. After repairs are complete, go to step  14 .
  13. Replace the EBCM. See ELECTRONIC BRAKE CONTROL MODULE (EBCM) REPLACEMENT in appropriate ANTI-LOCK article. After repairs are complete, go to next step.
  14. Turn OFF the ignition for 5 seconds. Ensure the park brake is released. Turn ON the ignition while observing the brake warning indicator. Does the brake warning indicator illuminate for 3 seconds and then turn OFF? If so, system is okay. If not, go to step  2 .
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