Troubleshooting Hints

Procedure
Note: Perform before beginning System Diagnosis

1. Always suspect an open lamp filament before proceeding with diagnostics.
2. Make sure Lamp Connectors are free from corrosion.
3. Check that grounds G200, G106 and G105 are clean and tight.
4. Check Fusible Link Z for open.
5. Check TAIL LTS Fuse 10 and I/P Dimmer Fuse 13 for open. If fuse(s) are open, refer to Chart #9 in this section. Chart 9 One Fog Lamp Inoperative
6. If Headlamp door(s) do not open and Headlamps do not illuminate, repair Headlamp door(s) failure first. See "Headlight Motor."

^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check. Use Test Light J 34142 whenever possible. Test lights require more current than a high impedance DVM and are more useful for detecting abnormally high resistive circuits. Some test lights have high impedances and will not be as useful in detecting resistive circuits.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.