The windshield wipers are obstructed

Leaves or snow, for example, may be obstructing the windshield wiper movement.

The wiper motor has been deactivated.

SmartKey from the ignition lock. For safety reasons, you should remove the SmartKey from the ignition lock.

or

button and open the driver's door. Switch off the engine using the Start/Stop button and open the driver's door.

Switch the windshield wipers back on. Remove the cause of the obstruction.

The windshield wipers are inoperative Switch the windshield wipers back on.

    See also:

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    Cleaning the steering wheel and gear or selector lever
      Thoroughly wipe with a damp cloth or use leather care agents that have been recommended and approved by Mercedes- Benz. ...

    Call priority
    When service calls are active, e.g. Roadside Assistance or MB Info calls, an emergency call can still be initiated. In this case, an emergency call will take priority and override all other active ...