General information

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.

Check the battery in the SmartKey and replace it if necessary.
Unlock the driver's door using the mechanical key.
Lock the vehicle.
Have the starter battery and battery contacts checked at an authorized Mercedes-Benz Center.

If the SmartKey is faulty, contact Roadside Assistance or an authorized Mercedes-Benz Center.

    See also:

    Low-beam headlamps (halogen headlamps)
    - Remove the cover in the front wheel arch. - Turn housing cover 1 counter-clockwise and pull it out. - Turn bulb holder 2 counter-clockwise and pull it out. - Take the bulb out of bulb holde ...

    Fuel filler flap
    The fuel filler flap is unlocked or locked automatically when you open or close the vehicle with the SmartKey or using KEYLESSGO. The position of the fuel filler cap is displayed in the instrument ...

    Setting the side air vents
    ► To open/close: turn thumbwheel 3 to the left or right. Side window defroster vent 1 is never completely shut, even if side air vent 2 is shut. ...