See also:

Switching on automatically
Select transmission position R with the engine running. ...

Rear doors
Rear doors Push the locking lever on the rear doors down. The door can now be opened from the outside only. ...

Switching on/off manually
Switching on/off manually Press the button. ▷ On: the LED lights up. ▷ Off: the LED goes out. If PDC is displayed, switch on the backup camera via the iDrive ...