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:
What to do if...
▷ The current transmission position cannot be
displayed?
The vehicle is located in an unrecognized
region, is in a poor reception area, or the
system is currently determining the position ...
Pairing and connecting
Pairing the mobile phone
To avoid becoming distracted and posing
an unnecessary hazard both to your own vehicle's
occupants and to other road users, only
pair the mobile phone while the vehicle i ...
Mounts for the lower LATCH anchors
Correctly engage the lower LATCH anchors
Make sure that the lower LATCH anchors have
properly engaged and that the child restraint fixing
system is resting snugly against the backrest;
otherwi ...
