Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS , TESTING FOR INTERMITTENT AND POOR CONNECTIONS , WIRING REPAIRS and CONNECTOR REPAIRS in Wiring Systems.