er’s Manual regarding the scope of the sys‐
tem’s operation and limitations.
Upper speed limit
If the vehicle speed exceeds approx.
155 mph/250 km/h, the system is deactivated
If the vehicle speed falls below approx.
155 mph/250 km/h, the system once again re‐
sponds according to the setting.
The system may not be fully functional in the fol‐
▷ When a vehicle is approaching at a speed
much faster than your own.
▷ In heavy fog, wet conditions, or snowfall.
▷ In tight curves or on narrow lanes.
▷ If the bumper is dirty, iced up, or covered,
for instance by stickers.
▷ If cargo protrudes.
Attaching any objects such as stickers or film in
the beam area of the radar sensors will also im‐
pact the function of the radar sensors and may
even cause them to fail.
A Check Control message is displayed when the
system is not fully functional.
Depending on the selected warning settings, for
instance warning time, more warnings can be
displayed. However, there may also be an excess
of premature warnings of critical situations.
Rear collision preparation
The system reacts to vehicles approaching from
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 170: if a colli‐
sion seems to be unavoidable, PreCrash
functions are triggered.
The system cannot serve as a substitute for the
driver’s personal judgment in assessing visibility
and traffic situation. There is a risk of accident.
Adjust driving style to traffic conditions. Watch
traffic closely and actively intervene where ap‐
Indicators and warnings cannot serve as a sub‐
stitute for the driver’s personal judgment. Due
to its limits, the system may not issue warnings
or reactions, or these may be issued late or in a
manner that is not consistent with their normal
use. There is a risk of accident. Adjust driving
style to traffic conditions. Watch traffic closely
and actively intervene where appropriate.
Online Edition for Part no. 01402779051 - II/19