Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Always suspect an open lamp filament before proceeding with diagnostics.
2. Make sure connectors and terminals are free from corrosion.
3. Make sure grounds G115 and G116 are clean and tight.
4. If Headlights, Park Lights and Fog Lights do not operate, suspect an open Exterior Lighting Fuse 60 amp (Underhood Fuse Block #2). Refer to "Power Distribution." Power and Ground Distribution
^ Check for a broken (or partially broken) wire inside of 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 systems (Refer to General Troubleshooting Procedures.) Diagnostic Aids
^ Refer to System Diagnosis. System Diagnosis