See also:

Activating audio AUX mode
When you connect an external audio source, audio AUX is not selected automatically. Select Audio in the main function bar by sliding and turning the COMAND controller and press to confirm. ...

Please bear the following in mind
At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" sectio ...

Engaging reverse gear R
Only shift the automatic transmission to R when the vehicle is stationary. - When the vehicle is stationary, depress the brake pedal. - Push the DIRECT SELECT lever up past the first poin ...