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:

    Connecting Bluetooth® devices
    General information Before using your Bluetooth® device with COMAND for the first time, you will need to connect it. Connecting comprises: • searching for a Bluetooth® device • subsequentl ...

    PRE-SAFE® Brake
    PRE-SAFE® Brake is only available in vehicles with DISTRONIC PLUS. Observe the "Important safety notes" section. PRE-SAFE® Brake can help you to minimize the risk of a frontal col ...

    Seat belt
    Display messages Possible causes/consequences and Solutions After starting the engine, the red seat belt warning lamp lights up for six seconds. The seat belt war ...