Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check all fuses for possible open including Back Up Fuse.
2. If Backup Lights do not turn "ON" in "REVERSE," but do for another gear, check for proper adjustment of the Transmission Position Switch (Automatic Transmission).
3. Check for damaged or corroded connectors and terminals.
4. Make sure ground G401 is clean and tight.
^ 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. Flow of Diagnosis