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Safety
Occupant safety
2
Vehicle deceleration or acceleration and
the direction of the force are essentially
determined by:
ț the distribution of the force during the
impact
ț the collision angle
ț the deformation characteristics of the
vehicle
ț the composition of the object involved
in the collision, for example the other
vehicle
Factors that cannot be seen or measured
until after the collision are not used to de-
termine whether the airbag should be trig-
gered and are not decisive for this.
The vehicle may be substantially deformed
without an airbag being triggered, for exam-
ple if only relatively easily-deformable vehicle
parts such as the hood or fenders are affect-
ed by the collision and the required deceler-
ation threshold is not reached. On the other
hand, airbags may be triggered even though
the vehicle only displays minor deformation,
if, for example, rigid vehicle parts such as a
longitudinal member are affected by the im-
pact, thus causing vehicle deceleration to ex-
ceed the pre-determined threshold.
Emergency tensioning retractors, belt
force limiters
If the vehicle is equipped with a driver’s air-
bag, the driver’s and the co-driver’s seat
belts are equipped with emergency ten-
sioning retractors.
A belt force limiter additionally installed in
the seat belt reduces the load exerted by
the seat belt on the occupant when it is
triggered.
Emergency tensioning retractors tension
the seat belts in an accident, pulling them
close against the body.
When the ignition is on, the emergency
tensioning retractor is activated:
ț only if the restraint systems are opera-
tional (the 1-warning lamp comes
on for approximately 4 seconds after
the ignition is switched on.)
(୴ page 28).
ț in the event of a head-on or rear-end
collision, if there is a high rate of vehi-
cle acceleration or deceleration in the
initial stages of a collision
ț in the event of a side impact, if the ve-
hicle suddenly decelerates or acceler-
ates in a lateral direction at the initial
stage of the impact and the vehicle is
equipped with thorax/sidebags and/
or windowbags.
If the emergency tensioning retractors are
triggered, you will hear a bang that is gen-
erally harmless to your hearing. A small
amount of powder may also be released.
The 1 warning lamp lights up.
i
Emergency tensioning retractors do
not correct:
ț incorrect sitting positions
ț incorrectly worn seat belts
Emergency tensioning retractors do
not pull occupants back towards the
backrest.