GM Service Manual Online
For 1990-2009 cars only

The cruise control system uses a cruise control module in order to obtain and hold any desired vehicle cruise speed above a minimum speed of 40 km/h (25 mph).

The following 2 components within the module help achieve this function:

    • An electronic controller that performs the following functions:
       - Monitors the vehicle speed.
       - Monitors the turn signal and the multifunction switch inputs.
       - Monitors the cruise control release and the brake switch inputs.
       - Operates the electric stepper motor.
    • A stepper motor which moves an internal band (linked to the throttle lever via the cruise control cable) in response to the controller in order to maintain the desired cruise speed.

Cruise Control Cable

The cruise control cable is adjustable and provides a physical connection between the following components:

    • The cruise control module
    • The engine throttle lever

Vehicle Speed Sensor

The vehicle speed sensor (VSS) is mounted to the automatic transaxle. The VSS provides a low voltage alternating current (AC) signal to the powertrain control module (PCM). The PCM converts the AC signal to a pulse width modulated direct current (DC) signal. The DC signal is sent to the cruise control module at a rate of 4,000 pulses per mile.

Cruise Control Release Switch and Stop Lamp Switch

The cruise control release switch and the stop lamp switch disengage the cruise control system. A cruise control release switch and a stop lamp switch are mounted on the brake pedal bracket. The switches disengage the system electrically when the brake pedal is pressed.