Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
^ Make the following checks before beginning system diagnosis.
1. Check all fuses by visual inspection.
2. Ensure that all connectors in system are mated correctly.
3. Check for open in Class 2 Serial Data Line (CKT 1807), refer to Data Link Connector (DLC). Data Link Connector
4. Do NOT replace the Body Function Controller (BFC) with only History Codes Set.
^ 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.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of their systems (refer to Troubleshooting Procedures Diagnostic Aids
^ Check that all grounds are tight and clean.
^ Refer to System Diagnosis. System Diagnosis