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:

    More power, lower consumption: the engines
    An improvement of up to 31 per cent has been achieved in fuel consumption and all Mercedes-Benz C-Class launch models will feature the ECO start/stop function as standard. All the engine variants ...

    Problems with the sliding sunroof
    In the following section, the term "sliding sunroof" refers to the panorama roof with power tilt/sliding panel. Problem: the sunroof cannot be closed and you cannot see the cause. W ...

    Vehicles with a TIREFIT kit
    ► Lift the cargo compartment floor up. 1 Jack 2 Towing eye 3 Ratchet wrench 4 Alignment bolt 5 Fuse allocation chart 6 Folding wheel chock 7 Lug wrench ...