Diagnostic Procedure

Erase (1st trip) DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM.
Check ground terminals for corroding or loose connection. If okay, go to next step. If not okay, repair as necessary.
Inspect suspect circuit. If circuit is okay, go to next step. If circuit is not okay, repair as necessary.
Check connectors and terminals. If terminals and connectors are okay, system is okay at this time. If terminals and connectors are not okay, repair as necessary.