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. ...

Switching on/off
The three blue indicator lamps in the buttons indicate the ventilation level you have selected. If the battery voltage is too low, the seat ventilation may switch off. - Make sure that ...

Towing a vehicle with both axles onthe ground
When having your vehicle towed, observe the important safety notes. WARNING   The power assistance for the steering and the brake force booster do not work when the engine is not runnin ...