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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes >> Symptom Tests >> Brake Warning Indicator Inoperative

Brake Warning Indicator Inoperative

  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. Turn ON the ignition, with the engine OFF. Observe the brake warning indicator. If the brake warning indicator illuminates briefly during the bulb check, go to step  3. If the brake warning indicator does not illuminate briefly during the bulb check, go to step  11.
  3. Turn ON the ignition, with the engine off. Apply the park brake. If the brake warning indicator illuminates, go to step  4. If the brake warning indicator does not illuminate, go to step  7.
  4. Turn OFF the ignition. Release park brake. Disconnect the brake fluid level indicator switch. Connect a 3-amp fused jumper wire between the signal circuit of the brake fluid level indicator switch and a good ground. If the brake warning indicator illuminates, go to step  5. If the brake warning indicator does not illuminate, go to step  9.
  5. Inspect for poor connections or a poor ground at the brake fluid level indicator switch. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  6.
  6. Inspect brake fluid level indicator switch for proper operation. If brake fluid level indicator switch works properly. If brake fluid level indicator switch does not work properly, go to step  15.
  7. Disconnect the park brake warning light switch. Connect a 3-amp fused jumper wire between the signal circuit of the park brake warning light switch and ground. If the brake warning indicator illuminated, go to step  10. If the brake warning indicator does not illuminate, go to step  8.
  8. Turn OFF the ignition. Disconnect the body control module. Test the signal circuit of the park brake warning light switch for a high resistance or an open. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  12.
  9. Turn OFF the ignition. Disconnect the instrument panel cluster. Test the signal circuit of the brake fluid level indicator switch for a high resistance or an open. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  11.
  10. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  11.
  11. Inspect for poor connections at the harness connector of the instrument cluster. If the condition was found and corrected, go to step  17. If the condition was not found and corrected, go to step  14.
  12. Inspect for poor connections at the harness connector of the Body Control Module. 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 instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If the repair was completed, go to step  17.
  15. Replace the brake fluid level indicator switch. See MASTER CYLINDER FLUID LEVEL SENSOR  under REMOVAL & INSTALLATION. If the repair was completed, go to step  17.
  16. Replace the Body Control Module. See appropriate BODY CONTROL MODULE article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If the repair was completed, go to step  17.
  17. Operate the system in order to verify the repair. If the condition was repaired, system okay. If the condition was not repaired, go to step  2.
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