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:

    BAS PLUS (Brake Assist System Plus)
    BAS PLUS is only available in vehicles equipped with DISTRONIC PLUS. Observe the "Important safety notes" section. At speeds above approximately 4 mph (7 km/h), BAS PLUS assists you ...

    Canceling Parking Guidance
    Press the PARKTRONIC button on the dashboard. Parking Guidance is canceled immediately and PARKTRONIC is deactivated. Parking Guidance is canceled automatically if it is no longer possible to ...

    Flat tire
    The "Breakdown assistance" section () contains information and notes on how to deal with a flat tire. It also provides instructions on changing a wheel or mounting the spare wheel/emerge ...