The system cannot detect objects reliably and will be deactivated. The sensor is out of alignment or defective. Drive to a qualified workshop and have the fault rectified.

These messages appear if the radar sensor vision is impaired, e.g. by leaves, snow, heavy road spray or dirt. Clean the sensor Fig. 1.

The maximum possible road gradient for safe operation of the adaptive cruise control has been exceeded. The adaptive cruise control cannot be switched on.

Move the selector lever to position D/S or M.

The adaptive cruise control system is deactivated if the parking brake is applied. The adaptive cruise control will be available again when the parking brake is released.

This message appears if the electronic stabilisation control (ESC) intervenes. In this case, the adaptive cruise control will automatically be switched off.

This message appears if the vehicle rolls backwards when driving away on a slight gradient, even though the adaptive cruise control is active. Press the brake pedal to prevent the vehicle from rolling back or colliding with an object behind.

This message appears if the driver does not change gear in time when the adaptive cruise control accelerates or brakes the vehicle. The adaptive cruise control is switched off if the engine speed is not maintained within the permissible range. This is indicated by a warning tone.

Three white dots appear if a setting made with the control lever cannot be implemented. This might happen after stopping, for example, if the adaptive cruise control cannot set the vehicle in motion because the driver has unbuckled the seat belt.

You cannot switch on the adaptive cruise control if the vehicle is stationary and the driver's door is open.