LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 1998 >> Wrangler SE, Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel >> Testing >> Brake Warning Light Indicator Test

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 BRAKE SYSTEM article.
  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 fuse holder. If battery voltage is present, go to next step. If battery voltage is not present, 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. Using an ohmmeter, check for 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 for 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 for 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 for 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 for 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 PANEL  under REMOVAL & INSTALLATION. Check for continuity between ground and terminal No. 2 (Gray/White wire) at instrument cluster 10-pin, Green connector. 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 10-pin Green 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.
scientia non olet · About LEMON Manuals