See also:

Remote vehicle locking
If you forget to lock your vehicle but are no longer in the vicinity of the vehicle, it can be locked for you by the Mercedes-Benz Customer Assistance Center. The vehicle can be locked remotely ...

Removing the towing eye
  Loosen the towing eye and unscrew it.   Attach cover 1 to the bumper and press until it engages.   Place the towing eye in the vehicle tool kit. ...

Activating/deactivating the MONO function
This function is only available in vehicles for Canada. You can use the MONO function to adopt the temperature and air distribution settings on the driver's side for the front-passenger side. ...