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:

    Direction of rotation
    Tires with a specified direction of rotation have additional benefits, e.g. if there is a risk of hydroplaning. You will only gain these benefits if the correct direction of rotation is mainta ...

    Safety & Reliability
    As of this writing, the Insurance Institute for Highway Safety had not yet crash-tested the GL-Class. The nine standard airbags include three-row side curtain airbags, a driver's knee airbag and s ...

    Belt warning for the driver and frontpassenger
    Regardless of whether the driver and front passenger have fastened their seat belts already, the seat belt warning lamp lights up for 6 seconds after every engine start. It then goes out if the d ...