Functional Check

WARNING: This page is about a different car, the 1997 GMC C3500 HD, 1997 Chevrolet Suburban, 1997 Chevrolet Pickup, 1997 Chevrolet Cab & Chassis, and 1997 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Use this procedure to check operating modes of the cruise control system. Always use this procedure following any repair on cruise control system.

Slide turn signal lever cruise switch to ON position.
To check low speed inhibit, drive vehicle at 20 MPH. Depress SET button and release. Cruise control must not engage.
To check set speed, drive vehicle at a steady 55 MPH. Depress SET button and release. Cruise control should engage at about 55 MPH.
To check brake release, while driving with cruise control set, depress brake pedal. Cruise control must release throttle, allowing vehicle speed to drop. System must not re-engage when brake is released.
To check resume feature, with vehicle speed at about 45 MPH, slide cruise control switch briefly (less than one second) to R/A position. Vehicle should accelerate to about 55 MPH.
To check coast feature, depress SET button and hold. Allow vehicle speed to drop to 50 MPH and release button. Cruise control should hold vehicle speed at about 50 MPH.
To check accelerate feature, slide cruise to R/A position and hold. Vehicle speed should begin to increase. Allow speed to increase to 55 MPH and release switch. Cruise control should hold vehicle at about 55 MPH.
To check OFF switch, turn cruise control switch to OFF position. Cruise control must disengage. If cruise control is inoperative and preliminary inspection gives no solution, and/or SERVICE ENGINE SOON (MIL) light is on, see TESTS W/CODES - 6.5L article in ENGINE PERFORMANCE section. If cruise control is inoperative and no diagnostic trouble codes are stored, check for faulty cruise control switch, open wiring, or poor connections.