See also:

Activating/deactivating the rear view camera
– To activate: make sure that the SmartKey is in position 2 in the ignition lock. – Make sure that the "rear view camera" function is selected in COMAND (see the separate operating in ...

Overhead control panel
  ...

Guide lines in the COMAND display
WARNING Use of rear view camera can be dangerous if you are color-blind or have impaired color vision. Only use rear view camera if you can see and distinguish all colored guidelines shown ...