Diagnostic Aids
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Refer to EXTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION in Lighting Systems, in order to avoid a misdiagnosis.
For an intermittent, refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.