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. ...

Important safety notes
WARNING On slippery road surfaces, never downshift in order to obtain braking action. This could result in drive wheel slip and reduced vehicle control. Your vehicle's ABS will not preve ...

BAS (Brake Assist System)
Observe the "Important safety notes" section. BAS operates in emergency braking situations. If you depress the brake pedal quickly, BAS automatically boosts the braking force, thus ...