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Adaptive cruise control can deactivate automatically if the radar sensor is dirty, iced over or occluded, if the weather conditions are unfavorable (heavy rain) or while driving through a tunnel.
A warning message appears on the multifunction display indicating that ACC is unavailable.
Operation of adaptive cruise control (ACC)
No vehicles detected ahead – open road
Adaptive cruise control behaves like a speed control system. The desired speed set is kept constant.
Vehicle detected ahead – follow at a safe distance
If another vehicle that is traveling slower than the selected speed is detected up ahead in the same lane, adaptive cruise control automatically maintains a set distance.
If the vehicle in front stops, adaptive cruise control slows the vehicle and brings it to a stop, provided that this is possible within the system’s control parameters.
Adaptive cruise control actively keeps the vehicle in a stationary position. When the vehicle in front drives off, the automatic speed and distance control can start again.
The speed of the vehicle can be increased at any time by pressing the accelerator pedal.
If the speed set by adaptive cruise control is exceeded, adaptive cruise control is be deactivated.
A message appears on the multifunction display indicating that ACC is now passive. The desired speed setting is retained.
After the accelerator pedal is released, adaptive cruise control maintains the desired speed on an open road, or the appropriate distance when traveling behind another vehicle.
For further information on the ACC operating states:
Using adaptive cruise control (ACC)
RSwitching ACC on/off
1Set/increase the desired speed
2Reduce the desired speed
The driver can intervene at any time by pressing the brake or the accelerator pedal.