The concept
If the vehicle is equipped with Active Cruise Control with Stop & Go, the collision warning is controlled via the cruise control radar sensor.
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:
Parts and accessories
For your own safety, use genuine parts and accessories
approved by BMW.
When you purchase accessories tested and approved by BMW and Original BMW Parts,
you simultaneously acquire the assurance ...
Convertible: convertible top
The fully automatic top combines reliable weather protection with simple and
easy-touse operation.
The following tips will enhance your driving pleasure in your Convertible:
> It is recommended ...
Date
The date is displayed in the instrument
cluster.
Setting the date and date format. ...
