Troubleshooting Hints

1. CHECK condition of LIGHTING Maxi Fuse. If the Fuse is open, LOCATE and REPAIR cause of overload and REPLACE Fuse.
2. CHECK that Grounds G109 and G201 (Sealed Beam Headlamps) or that Grounds G108, G109, and G201 (Composite Headlamps) are clean and tight.
3. CHECK that Headlamp filaments are not open.
4. CHECK that the Instrument Cluster High Beam Indicator filament is not open.
5. CHECK that the Headlamp Switch 17A Circuit Breaker is not open. It will reset automatically after cooling down.
^ CHECK for a broken (or partially broken) wire inside the insulation which could cause system malfunction but prove GOOD in a Continuity/Voltage check with a system disconnected. These Circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a Voltage drop with the system operational (under load).
^ CHECK for proper installation of aftermarket electronic equipment which may affect the integrity of other system (Refer to "General Troubleshooting Procedures,"). Diagnostic Aids