The concept
The system issues a two-phase warning of a danger of collision at speeds above approx.
10 mph/15 km/h. The time of these warnings may vary depending on the current driving situation.
The collision warning is available even if cruise control has been deactivated.

It responds to stationary or moving objects that are within the detection range of the radar system.
When the vehicle is intentionally brought into contact with a vehicle, the collision warning is delayed to avoid false warnings.
See also:
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. ...
Managing the favorites
Activating/deactivating the favorites
Favorites can be activated and deactivated
globally and individually.
1. "Satellite radio"
2. "Manage
favorites"
3. Select "Activ ...
Mobile communication devices in the
vehicle
Mobile communication devices in the vehicle
It is advised that you do not use mobile communication
devices, e.g., mobile phones, inside the
vehicle without connecting them directly to the
exte ...
