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.
- Check the battery in the SmartKey and replace it if necessary.
- Unlock the driver's door using the mechanical key.
- Lock the vehicle using the mechanical key.
- 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:

    Other bulbs
    There are bulbs other than the Xenon bulbs that you cannot replace. Replace only the bulbs listed. Have the bulbs that you cannot replace yourself changed at a qualified specialist workshop. ...

    Removing and installing the cover in the front wheel arch
    You must remove the cover from the front wheel housing before you can change the front bulbs. - To remove: switch off the lights. - Turn the front wheels inwards. - Slide up cover 1  and ...

    Please bear the following in mind
    At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" ...