See also:

Dashboard fuse box
Do not use a pointed object such as a screwdriver to open the cover in the dashboard. You could damage the dashboard or the cover.   To open: pull out cover 1 slightly at the bottom i ...

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. ...

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 ...