See also:

The concept
In addition to the PDC Park Distance Control, the backup camera, can be switched on. PDC supports you when parking. Objects that you are approaching slowly in front of or behind your vehicle ...

Switching on automatically
With the engine running or the ignition switched on, shift the selector lever into position R. ...

Remove attached partsfollowing use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...