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Safety
51
Seat belts
1)
Only if fitt
ed with the PreCrash System.
protection can tension the front seat belts auto-
matically if they ar
e worn
1)
. The two belts are
loosened again if an accident does not happen
or when the critical situation passes. Proactive
occupant protection is ready to operate again
›››page52.
Seat belt tensioner
The seat belts on the front seats and, depend-
ing on the equipment, side rear seats are fitted
with tensioners.
The tensioners are activated by sensors in the
event of severe head-on, side and rear colli-
sions (in hybrid vehicles they are also activated
in the event of a roll-over), and they tension
the seat belts in a direction opposite their ex-
tension.
If the seat belt is slack, the tensioner tightens
it. This cushions the movement of occupants
forwards towards the impact.
The belt pre-tensioners work in combination
with the airbag system. The belt pre-tensioners
activate in combination with some of the air-
bags, depending on the collision type.
When activated, a fine powder may be re-
leased. This is completely normal and it is not
an indication of fire in the vehicle.
Reversible belt tensioning (proactive occu-
pant protection)
A reversible tensioning of the seat belts may
occur in certain driving situations ›››page52.
For example:
●
in the event of sudden brakes
●
in the event of oversteering or understeering
●
in the event of minor collisions
Belt force limiter
Depending on the equipment and the country
in question, in the event of an accident, the seat
belt force limiter reduces the force the seat belt
exerts on the body.
Note
●
After certain driving situations, the reversi-
bl
e belt tensioners may be left permanently
tensioned
1)
. In this case, to loosen the belt, it
must be removed manually while the vehicle
is stationary and then replaced correctly.
●
The relevant safety requirements must be
observed if the vehicle or any components of
the system are to be scrapped. Specialised
workshops are aware of these requirements.
Maintenance and disposal of seat
belt tensioners
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.
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