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. ...

Problems with the engine
Problem Possible causes/consequences and - Solutions The engine does not start. The starter motor can be heard.  - There is a malfunction in the engine electronics. ...

Charging the batter
WARNING   Never charge a battery still installed in the vehicle unless a battery charger unit approved by Mercedes-Benz is being used. Gases may escape during charging and cause explosio ...