Troubleshooting Hints

Perform before beginning System Diagnosis
1. Make sure Headlights and Park Lights operate normally when using the Light Switch before proceeding with Daytime Running Lamp (DRL)diagnosis.
2. Make sure the Brake Warning System is functioning properly. DRL will not turn "ON" if Park Brake is "ON."
3. Check Fusible Link Z for open.
4. Check Turn B-U Fuse 2, Gages Fuse 9 and TAIL LTS Fuse 10 for open. If fuse(s) are blown, replace fuse(s). If fuse(s) re-blows, check for short to ground through the suspected circuit(s).
^ 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