Cruise Control Disengaged: Notes

The ECM disengages the cruise control operation based on the signals from the following switches:

• The BPP sensor
• The CPP sensor, if equipped with a manual transmission
• The cruise control On/Off switch

The BPP sensor and the CPP sensor are used to disengage the cruise control system. 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 BCM monitors the BPP sensor via the brake pedal position sensor signal circuit. The BCM sends a serial data message to the ECM 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 . Pressing the clutch pedal while the cruise control is engaged will also disengage the Cruise Control System. The engine control module (ECM) monitors the CPP sensor via the CPP sensor signal circuit as the voltage signal decreases while the pedal reaches the fully applied position.

The cruise control system will also disengage when the cruise control on/off switch is switched OFF. The BCM sends a serial data message to the ECM in order to disengage the cruise control system. The vehicle speed stored in the memory of the engine control module will be erased when the cruise control On/Off switch is turned OFF, or the ignition switch is turned OFF. The cruise control system will also disengage 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 serial data message to the driver information center (DIC) in order to turn off the CRUISE ENGAGED message.

Every time the cruise control system is disengaged, the ECM will keep track of the reason for system disengagement. The last 8 disengagement reasons will be recorded within the ECM memory. The scan tool will display the last 8 Cruise Disengage History parameters, in which one out of approximately 50 possible reasons will be displayed in each of these 8 parameters. For the disengagement reason to be displayed within the scan tool parameter either the cruise control system is active and disengagement is requested, or engagement of the system is requested but a fault is present. For a list of each disengagement reason along with each definition, refer to Control Module References in the ECM Scan Tool Information.