The tensioner is triggered by a frontal impact in a collision with a force exceeding a certain value. For weaker impacts and impacts to the rear of the vehicle, the system will not activate.
As soon as the fuse is fired, the small primer instantly releases gas, filling the tensioner cylinder. At the same time, the piston in the cylinder moves along the cylinder, pulling the cable, pulling, respectively, the seat belt. After the seat belt tensioner has deployed, it is replaced along with the impact sensors.
There is a risk of injury due to unauthorized operation of the system during work in the vehicle interior. It is recommended to entrust the performance of work requiring intervention in the system to specialists of a dealer car service. Pay attention to the following warnings before deciding to carry out such work yourself.
Attention!
- Do not expose pretensioners to overheating in excess of 100°C.
- Always disconnect the wire "masses" battery when working with seat belt systems (see the warnings in chapter 12, concerning SRS systems).
- If any work on the car requires hitting with a sledgehammer (sometimes a hammer is enough), remove the pretensioner control systems fuse by de-energizing the system and wait at least five minutes for the system to deactivate.
- If the tensioner mechanism has been dropped, it must be replaced even if there is no visible damage.
- Do not allow any solvents to enter the tensioner mechanism.
- Do not attempt to open the tensioner mechanism - it contains explosive gas.
- The tensioners must be unloaded before storage, but this operation must be entrusted to the specialists of the dealer car service.
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