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Brake Warning Light Indicator Test

  1. Ensure parking brake is released. Turn ignition on. If brake warning light stays on, check and repair hydraulic brake system as necessary. See appropriate DISC & DRUM article in BRAKES. If anti-lock brake indicator does not operate, ABS system may use brake warning light. For ABS testing, see appropriate ANTI-LOCK article in BRAKES.
  2. If BRAKE warning light does not illuminate when ignition is on, check warning light bulb. Replace bulb as necessary and retest. If bulb is okay, check fuse No. 10 (10-amp) in fuse box. Fuse box is located behind glove box. If fuse is okay, go to next step. If fuse is blown, locate and repair cause of blown fuse. Install new fuse and recheck system operation.
  3. Turn ignition on. Measure voltage between ground and power side of fuse No. 10. If battery voltage exists, go to next step. If battery voltage does not exist, locate and repair open circuit between ignition switch and fuse box.
  4. Turn ignition off. Disconnect negative battery cable. Disconnect parking brake switch connector. Switch is located at base of parking brake lever. Ensure parking brake lever is released. Check continuity between ground and parking brake switch terminal. If continuity does not exist, go to next step. If continuity exists, adjust or replace parking brake switch.
  5. Disconnect brake warning pressure switch at master cylinder. Check continuity between brake warning pressure switch terminals. If continuity exists, go to next step. If continuity does not exist, replace brake warning pressure switch.
  6. Check continuity between ground and each brake warning pressure switch terminal. If continuity does not exist, go to next step. If continuity exists at either terminal, replace brake warning pressure switch.
  7. Ensure brake warning pressure switch and parking brake switch are still disconnected. Check continuity between ground and parking brake wiring harness connector terminal. If continuity does not exist, go to next step. If continuity exists, locate and repair short to ground.
  8. Turn and hold ignition switch in START position. Check continuity between ground and parking brake switch wiring harness connector terminal. If continuity exists, go to next step. If continuity does not exist, locate and repair open in Gray/Black wire between ignition switch and parking brake switch.
  9. Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Check continuity between ground and instrument cluster Blue C2 connector terminal No. 2 (Gray/White wire). If continuity does not exist, go to next step. If continuity exists, locate and repair short to ground in Gray/White wire.
  10. Check continuity of Gray/White wire between instrument cluster Blue C2 connector and brake pressure warning switch connector. If continuity does not exist, repair open in Gray/White wire. If continuity exists, no problem is indicated. Recheck brake warning light indicator bulb, and check bulb holder. Repair as necessary.
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