See also:

Cleaning the rear view camera
Use clear water and a soft cloth to clean camera lens 1. Do not clean the camera lens and the area around the rear view camera with a power washer. ...

Wet roads
WARNING After driving in heavy rain for some time without applying the brakes or through water deep enough to wet brake components, the first braking action may be somewhat reduced. You h ...

Roadside Assistance button
  Press and hold Roadside Assistance button 1 for more than two seconds. This initiates a call to the Mercedes-Benz Customer Assistance Center. The indicator lamp in Roadside Assistance but ...