See also:

Activating the rear view camera
Make sure that the SmartKey is in position 2 in the ignition lock. Engage reverse gear. The area behind the vehicle is shown in the COMAND display with guide lines. ...

General notes
If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. •► Check the bat ...

Aspect ratio
Relationship between tire height and tire width in percent. ...