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Safety
45
PreCrash system
Maintenance and disposal of seat
belt t
ensioners
The belt tensioners are components of the seat
belts that are installed in the seats of your
vehicle. If you work on the belt tensioners or
remove and install parts of the system when
performing other repair work, the seat belt may
be damaged. The consequence may be that,
in the event of an accident, the belt tensioners
function incorrectly or may not function at all.
So that the eectiveness of the seat belt ten-
sioner is not reduced and that removed parts
do not cause any injuries or environmental pol-
lution, regulations, which are known to the spe-
cialised workshops, must be observed.
WARNING
Improper handling and home repairs to seat
belts, aut
omatic retractors and belt tension-
ers may increase the risk of serious or fa-
tal injuries. The tensioners may not activate,
even though they should, or they may acti-
vate unexpectedly.
●
Never repair, adjust, or disassemble and
reassemble seat belt components or ten-
sioners. Always have this work carried out by
a specialist workshop.
●
Seat belts, tensioners and their automatic
retractors cannot be repaired and have to be
replaced.
For the sake of the environment
Airbag modules and belt tensioners may
cont
ain perchlorate.
Observe the legal requirements for their dis-
posal.
PreCrash system
How it works
The PreCrash system is an assistance system
that actives a series of measures to protect the
occupants of the vehicles in potentially risky
situations, but which cannot prevent a collision.
It only works completely if no special driving
profile is selected and if there are no operating
anomalies.
Basic features
Depending on the legal provisions of the coun-
try and the features of the vehicle, in critical
situations (e.g. in certain cases of emergency
braking or loss of control of the vehicle by the
driver) the following functions can be activated
separately or at the same time when the vehi-
cle is travelling faster than approximately 30
km/h (20 mph).
●
Reversible tensioning of front seat belts that
ar
e fastened.
●
Operation of the hazard warning lights.
●
Automatic closing of the windows until they
ar
e just cracked open and, depending on the
equipment, of the sunroof.
Depending on how critical the driving situation
is, the belts are either tightened individually, or
both belts at the same time.
In addition to Front Assist
In vehicles with Front Assist ›››page168, within
the limits of the system, information is assessed
on the risk of collision with the vehicle in front.
The functions of the PreCrash system may also
be activated if there is a high likelihood of a
rear-end collision, or during the activation of
Front Assist.
In addition to Side Assist
In vehicles with lane assist ›››page178, within
the limitations of each system, information is
assessed on the risk of collision with trac to
the rear of the vehicle. If a rear-end collision
is highly likely, the functions of the PreCrash
system may also be activated. In this situation,
the hazard warning lights are turned on with a
higher frequency of flashes.
In addition to the Emergency Assist system
In vehicles with emergency assist, driver status
information is assessed within the limitations of
this system. The following PreCrash systems
may be activated if a lack of activity is detec-
ted:
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