Technical information

Pyrotechnic retractor tensioner
.
Pyrotechnic end fitting pretensioner
.
The pyrotechnic retractor tensioner reduces belt slack by creating friction in the seat belt guides, primarily in the shoulder
region.
Sensors and control electronics activate a pyrotechnic unit which starts the automatic shaft rotating through a wound
cable.
To eliminate the film spool effect, a clamping fixture holds the seat belt strap secure when the occupant moves forwards.
At present, pyrotechnic end fitting pretensioners can only be fitted on the outer seats in the rear passenger compartment.
Since there is little space under the rear seat, a solution similar to that of the front belt tensioner is not possible. Belt slack
is therefore overcome by drawing in the seat belt strap at the end fitting. The automatic reel forms the top attachment
point, the end fitting pretensioner the bottom one.
The end fitting pretensioners are activated by the seat satellites and/or the seat module. A pyrotechnic unit is responsible
for tightening the seat belt.
Seat-integrated belt system
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