Belt retractor, belt tensioner, belt tension limiter
First read and observe the introductoryinformation and safety warnings
⇒
Introduction
The seat belts in the vehicle are part of the vehicle safety concept
⇒
Airbag system
and include the
following important functions:
Automatic belt retractor
Every seat belt is equipped with an automatic belt retractor on the shoulder part of the belt. Full
freedom of movement is made possible when the shoulder belt is pulled slowly or when the vehicle
is travelling at normal speeds. However, if the belt is pulled out quickly or during sudden braking,
during travel in mountains or bends and during acceleration, the automatic belt retractor is locked.
Fastened seat belts on the front seats may be tensioned automatically by the proactive occupant
protection system in critical situations, for example during emergency braking or as a result of
oversteering or understeering. Both seat belts are slackened if the accident does not happen, or
when the critical situation has passed. The proactive occupant protection system is ready to be
triggered again
⇒
Proactive occupant protection system
.
Belt tensioners
The seat belts for the front seat vehicle occupants, and in some cases those on the outer rear
seats, are equipped with belt tensioners.
The belt tensioners are activated by sensors during severe frontal, side and rear collisions. They
tighten the seat belts against the direction in which they are pulled. Any slack in the seat belt is
retracted, which can reduce the passenger's movement forwards or in the direction of the impact.
The belt tensioner works together with the airbag system. If the vehicle rolls over, the belt
tensioners will not be activated if the side airbags are not triggered.
A fine dust may be produced when the airbags are triggered. This is quite normal and does not
mean that there is a fire in the vehicle.
Reversible belt tensioning (proactive occupant protection system)
Reversible belt tensioning may trigger in certain driving situations. For example:
• Heavy braking,
• Oversteer or understeer,
• Minor collisions.
⇒
Proactive occupant protection system
Belt tension limiter
The belt tension limiter reduces the pressure exerted by the seat belt on the body during an
accident.
All safety requirements must be observed when the vehicle or components of the system are
scrapped. Qualified workshops are familiar with these requirements
⇒
Service and disposal of belt
tensioners
.
Service and disposal of belt tensioners
First read and observe the introductoryinformation and safety warnings
⇒
Introduction
Seat belts may become damaged during any work on the belt tensioners or while removing or
refitting any vehicle parts in conjunction with any other repair work. This damage will not always be
noticeable. The consequence may be that the belt tensioners could function incorrectly, or not
function at all, in the event of an accident.
Regulations must be observed to ensure that the effectiveness of the belt tensioner is not reduced
and that removed parts do not cause any injuries or environmental pollution. Qualified workshops
are familiar with these requirements.
Never adjust the seat belt height when the vehicle is in motion.
WARNING
