See also:

The windshield wipers are inoperative
The windshield wiper drive is malfunctioning. Select another wiper speed on the combination switch. Have the windshield wipers checked at a qualified specialist workshop. ...

Center console, lower section - AMG vehicles
  ...

Removing the ball coupling
– Remove the spring cotter. – Remove the bolt from the ball coupling recess. – Remove the ball coupling from the ball coupling recess. – Clean the ball coupling if it is dirty. Information on ...