See also:

Vehicle remote opening
If you have unintentionally locked your vehicle (e.g. the SmartKey is still in the vehicle) and a replacement SmartKey is not available, the vehicle can be opened by a Mercedes-Benz Customer Assis ...

SmartKey
SmartKey 0 To remove the SmartKey Vehicles with automatic transmission: shift the transmission to position P 1 Power supply for some consumers, such as the windshield wipers 2 Ignition (power su ...

Special seat belt retractor
All seat belts except the driver's seat belt are equipped with a special seat belt retractor. When activated, the special seat belt retractor ensures the seat belt will not slacken once the chi ...