Diagnostic Aids
- Check for poor connection at the BCM. Inspect harness connectors for:
- backed out terminals
- improper terminal mating
- broken connector locks
- improperly formed or damaged terminals
- poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors).
- Inspect the wiring harness for damage. Check for broken or chafed insulation.
- Check for poor connection at the headlamp switch.
- If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.
Courtesy of GENERAL MOTORS CORP.