Cruise Control Disengaged

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) disengages the cruise control operation based on the signals from one of the following:

The brake pedal position sensor
The On/Off switch
The Cancel switch

The body control module (BCM) monitors the signal circuit of the Cancel switch. When the Cancel switch is activated, the BCM detects a high signal voltage on the cruise control cancel switch signal circuit. The BCM sends a class 2 message to the PCM in order to disengage the cruise control system.

The brake pedal position sensor is mounted on the brake pedal bracket. Pressing the brake pedal while the cruise control is engaged will disengage the cruise control system. The BCM monitors the brake pedal position sensor via the brake pedal position sensor signal circuit. The PCM detects a high voltage signal on stop lamp switch signal circuit from the BCM indicating that the brake pedal has been pressed. For further information on the brake pedal position sensor, refer to Exterior Lighting Systems Description and Operation in Lighting Systems.

When the cruise control On/Off switch is turned OFF, the cruise control system will disengage.

The cruise control system will disengage when the PCM detects that a driver override function has been active for approximately 60 seconds.

When cruise control system has been disengaged, the PCM sends a class 2 message to the head-up display (HUD) and to the driver information center (DIC) in order to turn off the CRUISE SET message.

The vehicle speed stored in the memory of the engine control module (ECM) will be erased when the Off button is activated, or the ignition switch is turned OFF.