Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS:
1. Check I/P Fuse 33. If I/P Fuse 33 is open, check for a short to ground in CKT 40.
2. Check I/P Fuse 13. If I/P Fuse 13 is open, check for a short to ground in CKT 639.
3. Check I/P Fuse 6. If I/P Fuse 6 is open, check for a short to ground in CKT 239.
4. Check that ground C200 is clean and tight.
5. If Speedometer or Cruise Control (if equipped) does not operate properly, refer to Vehicle Speed Sensor. Vehicle Speed Sensor
^ 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 Diagnostic Aids. Diagnostic Aids
^ Refer to System Diagnosis. System Diagnosis