Safety
may be that, in the event of an accident, the
belt tensioners function incorrectly or may
not function at all.
Depending on how critical the driving situa-
tion is, the belts are either tightened individ-
ually, or both belts at the same time.
PreCrash system
How it works
So that the effectiveness of the seat belt
tensioner is not reduced and that removed
parts do not cause any injuries or environ-
mental pollution, regulations, which are
known to the specialised workshops, must
be observed.
In addition to Front Assist
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.
In vehicles with Front Assist page 239 ,
›››
within the limits of the system, information is
assessed on the risk of collision with the ve-
hicle 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.
It only works completely if no special driving
profile is selected and if there are no operat-
ing anomalies.
WARNING
●
Improper use or repairs not carried out by
qualified mechanics increase the risk of se-
vere or fatal injuries. The belt tensioners
may fail to trigger or may trigger in the
wrong circumstances.
In addition to the Emergency Assist system
Basic features
In vehicles with emergency assist, driver sta-
tus information is assessed within the limita-
tions of this system. The following PreCrash
systems may be activated if a lack of activity
is detected:
Depending on the legal provisions of the
country 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 vehicle is travelling faster than
approximately 30 km/h (20 mph).
●
The seat belt tensioner, seat belt and au-
tomatic retractor cannot be repaired.
●
Any work on the belt tensioners and seat
belts, including the removal and refitting of
system parts in conjunction with other re-
pair work, must be performed by a special-
ised workshop only.
●
Reversible seat belt tensioning of the driv-
er's seat belt.
●
Automatic closing of the windows until
they are just cracked open and, depending
on the equipment, of the sunroof.
●
The belt tensioners will only provide pro-
●
Reversible tensioning of front seat belts
that are fastened.
tection for one accident and must be
changed if they have been activated.
●
●
Operation of the hazard warning lights.
Automatic closing of the windows until
Activation of the PreCrash system
The PreCrash system can be partially deacti-
vated by deactivating the traction and / or
stability control, depending on the equip-
ment. When these vehicle safety controls
are switched on (by default, every time the
For the sake of the environment
they are just cracked open and, depending
on the equipment, of the sunroof.
Airbag modules and belt tensioners may
contain perchlorate. Observe the legal re-
quirements for their disposal.
●
In the event of overturning, depending on
the equipment, activation of the belt ten-
sioners.
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English 
