BMW X3 2018 Owner's Manual page 188

CONTROLS
▷ Up to 10 seconds after the start of the engine
via the Start/Stop button.
▷ During calibration of the camera immediately
after vehicle delivery.
A Check Control message is displayed when the
system is not fully functional.
If the trailer power socket is in use, for instance
during operation with trailer or bicycle rack, the
system cannot be switched on. A Check Control
message is displayed.
Rear collision prevention
Concept
The system reacts to vehicles approaching from
behind.
General information
Two radar sensors in the rear bumper monitor
the area behind the vehicle.
If a vehicle approaches from the rear at a certain
speed, the system responds as follows:
▷ Active Protection, refer to page 189: if a colli‐
sion seems to be unavoidable, PreCrash
functions are triggered.
The system is automatically active after every
driving off.
The system is deactivated in the following situa‐
tions:
▷ When driving in reverse.
188
Safety
Online Edition for Part no. 01402989843 - II/18
▷ If the trailer power socket is in use, for in‐
stance during operation with trailer or bicycle
rack.
Safety information
WARNING
The system cannot serve as a substitute for the
driver's personal judgment in assessing visibility
and traffic situation. There is a risk of an acci‐
dent. Adjust driving style to traffic conditions.
Watch traffic closely and actively intervene
where appropriate.
WARNING
Indicators and warnings cannot serve as a sub‐
stitute for the driver's personal judgment. Due
to its limits, the system might not output warn‐
ings or reactions or these might be output late,
incorrectly, or without justification. There is a
risk of an accident. Adjust driving style to traffic
conditions. Watch traffic closely and actively in‐
tervene where appropriate.
Overview
Radar sensors
The radar sensors are located in the rear
bumper.
Always keep the bumper in the area of the radar
sensors clean and unobstructed.