Troubleshooting Hints

TRY FOLLOWING CHECK BEFORE DOING SYSTEM DIAGNOSIS:
^ If a headlamp bulb is out, but lamp monitor (if equipped) does not indicate outage, Refer to Lamp Monitor, for diagnosis. Lamp Out Indicator

^ (With T61 or T62) If headlamps operate properly from Head/Park Lamp Switch, but do not turn ON automatically when equipped with Twilight Sentinel (T82), Refer to Twilight Sentinel/Daytime Running Lamps.
1. If one Headlamp doesn't work, check bulb, connector, and wiring to bulb.
2. If HI Beams do not light, but HI Beam Indicator lights, check LT GRN (11) or LT GRN/BLK (1311) wiring (see schematic) GRN/BLK (1311) wiring (see schematic) for an open, and check suspect Headlamp Assembly Connector for proper terminal contact.
3. If Headlamps on one side are dim, check the ground on that side. Check suspect Headlamp Assembly Connector for proper terminal contact.
4. If Headlamps do not turn "OFF", replace Head/Park Lamp Switch. If Headlights with Twilight Sentinel do not turn "OFF", Refer to Twilight Sentinel/Daytime Running Lamps.
5. If HI Beams light, but HI Beam Indicator does not, check bulb and LT GRN (11) and BLK (251) wiring for an open. Check Instrument Cluster Connector (see schematic) for proper terminal contact.
^ Refer to System Diagnosis for diagnostic tests. System Diagnosis