The system is installed in both front seats. The sudden deceleration of the vehicle during a frontal or near-frontal collision is detected by the mass sensor. If the deceleration is large enough, the sensor moves forward and activates the seat belt pretensioner. This occurs before the seat belt occupant is thrown forward by the impact. As a result, the seat belt is tensioned by about 120 mm, which is distributed between the shoulder and waist branches.
Pic. 21. Seat belt tensioner: 1 - seat belt buckle, 2 - ratchet
After the seat belt pretensioner has been activated, the belt buckle 1 (pic. 21) safety under the influence of the ratchet mechanism 2 will not be able to return to its original position on its own, it bounces down, below the edge of the seat cushion. The seat belt pretensioner is activated in a collision at speeds above 12 km/h.
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