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.

Perform the following in order to avoid a misdiagnosis:

Inspect for proper operation of the brake lamps. Refer to EXTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION in Lighting Systems.
Inspect for proper operation of the clutch, if equipped with a manual transmission. Refer to CLUTCH SYSTEM DESCRIPTION AND OPERATION in Clutch.
Electro magnetic interference (EMI) on the vehicle speed sensor signal circuit may cause erratic cruise control operation.
For an intermittent condition, refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.