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:

    Immobilizer
    The immobilizer prevents your vehicle from being started without the correct SmartKey. When leaving the vehicle, always take the SmartKey with you and lock the vehicle. The engine can be started ...

    Time/date
    This submenu is only available on vehicles with Audio 20. To set the time and the date for vehicles with COMAND, see the separate operating instructions. In the Time/date submenu, you can set the t ...

    Problems with the occupant classification system
    Problem Possible causes/consequences and Solutions The indicator lamp illuminates and remains illuminated. The person on the front-passenger seat: • has the weight of ...