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:

    Displays and controls
      ...

    High-beam spot lamp (vehicles with LED-daytime running lamps)/infrared light (Night View Assist Plus)
    Due to their location, have the bulbs in the left-hand headlamp changed at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. Switch off the lights. Open the hood. ...

    Roadside Assistance button
    ► Open the stowage compartment under the armrest. ► Press and hold Roadside Assistance button 1 for more than two seconds. This initiates a call to the Mercedes-Benz Customer Assi ...