See also:

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

Switching on/off manually
Press the button. On: the LED lights up. Off: the LED goes out. ...

USB audio interface/mobile phone audio interface
At a glance It is possible to connect external audio devices. Operation can be performed via iDrive. The sound is output on the vehicle loudspeakers. Connectors for external devices ▷ Conn ...