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:

    SETUP
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    The M-Class also protects its occupants after a crash
    As part of the POST-SAFE® functions, the new M-Class can activate a variety of systems which can contribute towards avoiding post-accident risks. After a more serious crash, the hazard warning lig ...

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    Active roll stabilisation in the form of the ACTIVE CURVE SYSTEM can be optionally combined with both the AIRMATIC air suspension with Adaptive Damping System (ADS) and the ON&OFFROAD package. ...