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:

    Notes for 4MATIC vehicles
    Vehicles with 4MATIC must not be towed with either the front or the rear axle raised, as doing so will damage the transmission. If the vehicle has transmission damage or damage to the front or ...

    Notes on using 3-zone automatic climate control
    The following contains instructions and recommendations to enable you to get the most out of your automatic climate control.  - Activate climate control using the and buttons. The indic ...

    Vehicle identification plate
    Even if you have calculated the total load carefully, you should still make sure that the gross vehicle weight rating and the gross axle weight rating are not exceeded. Details can be found on ...