Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.

The following are the main components of the cruise control system:

The cruise control system will engage and adjust vehicle speeds, based on the activation of the following cruise control switches:

The ECM monitors the signal circuits of the cruise control switches The ECM uses the cruise control switch signal circuit in order to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed sensor signal circuit in order to maintain the desired vehicle speed. The ECM uses the TAC motor in order control the vehicle speed. For further information on the TAC system, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 2.6 L and 3.2 L.

Ignition voltage is supplied to the cruise control switch from the 10 ampere STRG CTLS fuse via the ignition 1 voltage circuit. The cruise control switches are arranged in a resistive ladder, with each cruise control function switch having a different resistance value. The ECM detects a specific voltage value that is associated with the cruise control function switch being activated. When the normally open cruise control On/Off switch is turned ON, the switch closes and the amber switch indicator illuminates. The ECM detects a predetermined voltage signal on the cruise control switch signal circuit indicating that the On/Off switch is active. Similarly, when the "+" button or the "-" button are activated, the ECM detects the pre determined voltage signal on the cruise control switch signal circuit. To engage the cruise control system, turn the cruise control system ON by pressing the cruise On/Off button On and momentarily press the "-" button. The ECM will confirm that the cruise control criteria has been met. The ECM will record the vehicle speed and sends a class 2 message to the instrument panel cluster in order to illuminate the cruise indicator. The "-" button and the "+" button will remain inactive when the ECM has not received the predetermined voltage signal from the On/Off switch. Pressing the accelerator pedal, while the cruise control system is engaged, will allow the driver to override the cruise control system in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed. The driver can also override the current set vehicle speed via the "-" button and the Resume/Accel switch. When the cruise control system is engaged, pressing and holding the "-" button will allow the vehicle to decelerate from the current set vehicle speed without deactivating the cruise control system. When the "-" button is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily pressing the "-" button will allow the vehicle to decelerate at 1 MPH increments for each time that the "-" button is momentarily pressed, with a minimum vehicle speed of 23 MPH. Activating and holding the "+" button, when the cruise control system is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the "+" button is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily activating the "+" button will allow the vehicle to accelerate at 1 MPH increments for each time that the "+" button is momentarily activated, with the maximum acceleration total of 10 MPH over the current set vehicle speed . Momentarily activating the "+" button, after the cruise control system has been disengaged by pressing the brake pedal, will recall the previous set vehicle speed that is recorded in the ECM.

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

The TCC brake switch/cruise control release switch and the extended travel brake switch are incorporated into the TCC/cruise control release switch. The TCC brake switch/cruise control release switch, the stop lamp switch, and the extended travel brake switch are mounted on the brake pedal bracket. When the brake pedal is applied, the normally closed TCC brake switch/cruise control release switch and the normally closed extended brake travel switch opens. The normally open stop lamp switch closes. The ECM detects a low signal voltage on the TCC brake switch/cruise control release switch signal circuit and the extended travel brake switch signal circuit. The ECM detects a high signal voltage on the stop lamp switch signal circuit. When the clutch pedal is applied, the normally closed CCP switch opens and the ECM detects a low signal voltage on the CCP switch signal circuit. The vehicle speed stored in the memory of the ECM will be erased when the cruise control On/Off button is pressed, or the ignition switch is turned off.

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

When the cruise control system is disengaged, the ECM sends a class 2 message to the IPC in order to deactivate the cruise indicator.

The ECM inhibits the cruise control operation when any of the following conditions exist: