See also:

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. ...

Hazard warning lamps
The hazard warning lamps automatically switch on if: - an air bag is deployed. - the vehicle is slowed down severely from a speed of over 45 mph(70 km/h) and comes to a halt. - To switch on ...

Guide lines in the COMAND display
WARNING   Use of rear view camera can be dangerous if you are color-blind or have impaired color vision. Only use rear view camera if you can see and distinguish all colored guidelines ...