Cruise Control Disengaged

WARNING: This page is about a different car, the 2006 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) disengages the cruise control operation based on the signals from the following switches:

The brake pedal position (BPP) sensor
The clutch pedal position (CPP) switch
The cruise control On/Off switch

The BPP 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 body control module (BCM) monitors the BPP sensor via the brake pedal position sensor signal circuit. The BCM sends a GMLAN serial data message to the ECM and to the transmission control module (TCM) indicating the position of the brake pedal. For further information on the BPP sensor, refer to Exterior Lighting Systems Description and Operation or to Brake Pedal Position Sensor Calibration in Lighting Systems. When the clutch pedal is applied, the normally opened CPP switch closes and the ECM detects a high signal voltage on the CPP switch signal circuit.

The Cruise Control System will also disengage when the cruise control On/Off switch is switched OFF or when the ECM detects that a driver override function has been active for approximately 60 seconds.

When the Cruise Control System has been disengaged, the ECM sends a GMLAN serial message to the BCM. The BCM then sends a class 2 serial data message to the HUD in order to turn OFF the Cruise Speed SET XXX message.

The vehicle speed stored in the memory of the ECM will be erased when the cruise control on/off button is turned OFF, or the ignition switch is turned OFF.