See also:

Deactivating HDC
Press the button again; the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Dynamic Damping Control
The concept This system reduces undesirable vehicle motion when using a dynamic driving style or traveling on uneven road surfaces. The system enhances driving dynamics and comfort as required ...

Controls
Almost all functions can be operated in the same manner as they are in the front. Special features of operating the system in the rear are described here. ...