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.

SmartKey and 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.
mechanical key. Lock the vehicle using the mechanical key.
battery contacts checked at a qualified specialist workshop. 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:

    Charging the batter
    WARNING   Never charge a battery still installed in the vehicle unless a battery charger unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosio ...

    Important safety notes
    The rear view camera is an optical parking aid. It shows the area behind your vehicle in the COMAND display. WARNING Make sure that no persons or animals are in the maneuvering range. Otherwi ...

    Resetting to factory settings
    For safety reasons, the Day Lights function in the Lights submenu is only reset when the vehicle is stationary. Press the or button on the steering wheel to select the Settings menu. P ...