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Seat-belt tensioners

Seat-belt tensioners


The seat-belt tensioner stretches the seat-belt in case of a collision to reduce the forward body movement. The car is equipped with seat-belt tensioners on the driver's side and front passenger side.

Seat-belt tensioners consist of a pyrotechnical charge, which is activated by the SRS control module together with the airbag/airbags. When the charge is activated, a high gas pressure is generated, which drives a piston in an aluminium pipe. The piston is connected to the belt roller via a steel wire. The piston stroke is approx. 180 mm, which is the maximum length the seat-belt can be unrolled.

The seat-belt tensioner on the driver's side is connected to pins 1 and 2 on the SRS control module. The seat-belt tensioner on the passenger side is connected to pins 3 and 4 on the SRS control module.