See also:

Belt height adjustment
You can adjust the seat belt height on the driver's seat and the front-passenger seat. Adjust the height so that the upper part of the seat belt is routed across the center of your shoulder. ...

The mbrace system
The mbrace system provides different services, e.g.: automatic and manual emergency call Roadside Assistance call MB Info call To adjust the volume during an mbrace call, proceed as follows ...

Deactivating
Press and hold the closing button () in the tailgate until you hear two short tones. ...