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:

    Cornering light function
    Cornering light function The cornering light function improves the illumination of the road over a wide angle in the direction you are turning, enabling better visibility in tight bends, for ...

    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 ...

    Emergency braking
    The vehicle can also be braked during an emergency using the electric parking brake. While driving, push handle 1 of the electric parking brake. The vehicle is braked as long as you keep the ...