ACC Operation: Notes

NOTE: For a complete illustration of the ACC indicators and graphic displays, refer to the Owner's Literature.

The ACC system functions much like a standard cruise control system. The ACC system automatically adjusts the vehicle speed to maintain a set distance gap from the front of the vehicle and the vehicle in the same path of travel. When the ACC system is on and is following a vehicle or a vehicle enters the same driving lane, a follow vehicle graphic is displayed in the message center.

The ACC lane keeping system (if equipped), uses a forward looking camera mounted on the windshield to monitor vehicle movement within the travel lane. The lane keeping system alerts the driver by vibrating the steering wheel or aids the driver by providing a small steering input to move the vehicle back into the travel lane. Refer to the Owner's Literature for additional information.

The ACC system does not activate if the vehicle speed is below 20 kmh (12 mph) or if a lead vehicle is not detected. If either of these occur, the message center displays ADAPTIVE CRUISE - SPEED TOO LOW TO ACTIVATE.

Vehicles equipped with a 2.3L engine, the brake switch assembly (contains the stoplamp switch and cruise control deactivator switch) and APP sensor are direct inputs to the PCM.

Vehicles equipped with the 2.7L engine, the EBB (contains the stoplamp switch and cruise control deactivator switch). For additional information, Refer to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

The CCM is on a dedicated private CAN with the IPMA. The IPMA acts as a gateway and relays network messages and DTC information from the CCM to other modules that utilize the ACC system.

The CCM monitors the yaw rate signal from the ABS module and compares it to wheel speed and steering wheel angle signals. If the ABS module determines the yaw rate is invalid, the CCM disables the ACC. The message center displays the message COLLISION WARNING MALFUNCTION and/or ADAPTIVE CRUISE MALFUNCTION.

The CCM monitors the environment in front of the vehicle while active. If the radar beam is obstructed by a buildup of snow, ice, rain or other debris or the vehicle is driven in a desert environment with no other traffic for extended periods of time, the sensor triggers an ADAPTIVE CRUISE NOT AVAILABLE SENSOR BLOCKED SEE MANUAL message in the message center and disables the ACC. The ACC resumes once the obstruction is cleared and the radar is able to detect targets or upon a key cycle.

The ACC system does not engage properly if the CCM front radar sensor is not aligned correctly, the message center displays FRONT SENSOR NOT ALIGNED. The ACC resumes once the CCM is aligned and is able to properly detect targets.

The CCM vertical and horizontal alignment procedure is located in General Procedures. The horizontal alignment for the CCM is a calibration check performed by the scan tool to insure the CCM radar is pointed straight. The scan tool identifies this as, Alignment Offset with a horizontal specification of +/- 3.0 degrees offset. For additional information, Refer to: Cruise Control Radar Alignment .

The ABS module estimates brake temperature by monitoring applied brake pressure over a period of time and sends a message to the CCM when the estimated temperature is above a given threshold. An alarm sounds and the ACC system is deactivated until the estimated brake temperature returns to cooler operating conditions. This condition can happen in hilly or mountainous driving terrain.