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Seat belts
Seat belt tensioners
Aut
omatic belt r
etr
actor, belt ten-
sioner, belt tension limiter
Seat belts are part of the vehicle safety con-
cept
›››
page 60 and consist of the follow-
ing important functions:
Automatic belt retainer
Every seat belt is equipped with an automatic
belt retainer on the shoulder belt. If the belt is
pulled slowly or during normal driving, the
system allows for total freedom of movement
on the shoulder belt. However, during sudden
braking, during travel in mountains or bends
and during acceleration, the automatic belt
retainer on the seat belt is locked is pulled
quickly.
Belt tensioners
The seat belts for the occupants in the front
seats are equipped with belt tensioners.
Sensors trigger the belt tensioners during se-
vere head-on, lateral and rear collisions and
retract and tighten the seat belts. If the seat
belt is loose, it is retracted to reduce the for-
wards movement of occupants or movement
in the direction of the collision. The belt ten-
sioner works in combination with the airbag
system. The belt tensioner will not be trig-
gered in the event of the vehicle overturning if
the side airbags are not deployed.
If the belt t
ensioner is triggered, a fine dust is
produced. This is normal and it is not an indi-
cation of fire in the vehicle.
Belt tension limiter
The belt tension limiter reduces the force of
the seat belt on the body in the event of an
accident.
Note
The relevant safety requirements must be
observed when the vehicl
e is dismantled or
system components are removed. These
requirements are known to specialised
workshops
›››
page 59.
Service and disposal of belt ten-
sion de
vices
If you work on the belt tensioners or remove
and inst
all other parts of the v
ehicl
e when
performing other repair work, the seat belt
may be damaged. The consequence may be
that, in the event of an accident, the belt ten-
sioners function incorrectly or not at all.
So that the effectiveness of the belt tensioner
is not reduced and that removed parts do not
cause any injuries or environmental pollution,
regulations must be observed. These require-
ments are known to specialised workshops.
WARNING
●
Improper use or repairs not carried out by
qualified mechanics incr
ease the risk of se-
vere or fatal injuries. The belt tensioners
may fail to trigger or may trigger in the
wrong circumstances.
●
Never attempt to repair, adjust, remove or
install parts of the belt tensioners or seat
belts.
●
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.
●
The belt tensioners will only provide pro-
tection for one accident and must be
changed if they have been activated.
For the sake of the environment
Airbag modules and belt tensioners may
contain perchl
orate. Observe the legal re-
quirements for their disposal.
59
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