The windshield wipers are inoperative

The windshield wiper drive is malfunctioning.

the Select another wiper speed on the combination switch.
at a Have the windshield wipers checked at a qualified specialist workshop.

    See also:

    Fast forward/rewind
    While the display/selection window is active, slide and hold the COMAND controller until the desired position has been reached. ...

    Problems with the windshield wipers
    The windshield wipers are obstructed Leaves or snow, for example, may be obstructing the windshield wiper movement. The wiper motor has been deactivated. For safety reasons, you should remove t ...

    Checklist after driving off-road
    WARNING If you notice sudden significant vibrations or unusual handling performance or if you suspect that damage has occurred to the vehicle, you should activate the hazard warning lamps, g ...