See also:

DEF
Important safety notes For BlueTEC vehicles only. DEF is a non-flammable, non-toxic, colorless, odorless and water-soluble fluid. Only use DEF that complies with ISO 22241. Do not add any ...

Center console, lower section
  ...

Activating the rear view camera
► 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 inst ...