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:

    Displaying service messages
    Switch on the ignition. Press or on the steering wheel to select the Service menu. Press or to select the ASSYST PLUS submenu and press to confirm. The service due date a ...

    Remote control
    Overview 1 To switch the screen on/off 2 To switch the button lighting on/off 3 To select the screen for remote control operation (COMAND, SPLITVIEW, L REAR and REAR R can be selected) 4 ...

    4MATIC (permanent four-wheel drive)
    4MATIC ensures that all four wheels are permanently driven. Together with ESP® and ETS, it improves the traction of your vehicle whenever a drive wheel spins due to insufficient grip. WARNIN ...