General notes

If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged.

replace it if necessary. Check the battery in the SmartKey and replace it if necessary.
mechanical key. Unlock the driver's door using the mechanical key.
Lock the vehicle.
contacts checked at a qualified specialist Have the starter battery and the battery contacts checked at a qualified specialist workshop.

If the SmartKey is faulty, contact Roadside Assistance or a qualified specialist workshop.

    See also:

    Showing the distance display
    This function is only available with DISTRONIC PLUS. Press the or button on the steering wheel to select the DriveAssist menu. Press the or button to select Distance Display. Press ...

    Message memory
    The on-board computer saves certain display messages. You can call up the display messages in the message memory. – Press the or button on the steering wheel to select the Serv. menu. If th ...

    GVWR (Gross Vehicle Weight Rating)
    The GVWR is the maximum permissible gross weight of a fully loaded vehicle (the weight of the vehicle including all accessories, occupants, fuel, luggage and the drawbar noseweight, if applica ...