See also:

Activating HDC
Press the button; the LED above the button lights up. ...

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. ...

Switching on/off and interrupting cruise control
Switching on Press the button on the steering wheel. The indicator lamps in the instrument cluster light up and the mark in the speedometer is set to the current speed. Cruise control can ...