High Beam Headlights Will Not Turn On
NOTE:
After making any repairs, perform BODY CONTROL MODULES SYSTEM VERIFICATION TEST
under VERIFICATION TESTS.
- Locate high beam relay in junction block. See Figure . Turn headlights on. Cycle high beams on and off. If high beam relay clicks, go to next step. If high beam relay does not click, go to step 4 .
- Remove high beam relay from junction block. Measure voltage on high beam relay connector terminal No. 58, fused B+ circuit. If voltage is more than 10 volts, leave high beam relay removed, and go to next step. If voltage is 10 volts or less, repair fused B+ circuit between Power Distribution Center (PDC) fuse "C" and junction block. See WIRING DIAGRAMS .
- Using a fused jumper wire, connect high beam relay connector terminals No. 58 and 59. If high beams illuminate, replace high beam relay. If high beams do not illuminate, repair open in high beam relay output circuit between high beam relay connector and headlights. See WIRING DIAGRAMS .
- Remove and inspect fuse No. 11 (20-amp) in junction block. If fuse is open, leave fuse removed, and go to next step. If fuse is okay, go to step 7 .
- Disconnect multifunction switch connector. Measure resistance between ground and fuse No. 11 connector output circuit (Brown/White wire). If resistance is less than 100 ohms, repair short to ground in Brown/White wire between junction block and multifunction switch. If resistance is 100 ohms or more, leave multifunction switch connector disconnected, and go to next step.
- Remove high beam relay from junction block. Measure resistance between ground and high beam relay connector terminal No. 57, high beam relay control circuit. If resistance is less than 5 ohms, repair short to ground in high beam relay control circuit between multifunction switch and high beam relay, and install fuse. See HEADLIGHT SYSTEMS article. If resistance is 5 ohms or more, replace high beam relay.
- Remove high beam relay from junction block. Measure resistance between ground and high beam relay connector terminal No. 56, ground circuit. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between junction block and ground.
- Disconnect multifunction switch connector. Turn headlights on. Measure voltage on multifunction switch connector terminal No. 4, fused low beam relay output circuit (Brown/White wire). See Fig 1 . If battery voltage does not exist, leave multifunction switch connector disconnected, and go to next step. If battery voltage exists, replace high beam relay.
- Turn headlights off. Turn ignition off. Measure voltage on multifunction switch connector terminal No. 5, fused B+ circuit (Pink/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink/Red wire between multifunction switch connector and junction block.
- Install high beam relay. Using a fused jumper wire, connect multifunction switch connector terminal No. 4, fused low beam relay output circuit (Brown/White wire) and No. 7, switched high beam relay control circuit (White/Light Green wire). Turn headlights on. If high beams illuminate, repair open in White/Light Green wire. If high beams do not illuminate, replace multifunction switch.