See also:

Removing the mobile phone
  Press the button and remove the mobile phone. ...

Camera
Camera The camera is located near the base of the mirror. Keep windshield clean and clear in the area in front of the interior rear view mirror. ...

Switching on/off manually
Press the button. On: the LED lights up. Off: the LED goes out. The PDC is shown on the Control Display. Switch on the backup camera via the iDrive. ...