Seatbelt Tensioner

Seatbelt Tensioner





The pyrotechnic seatbelt tensioner is designed to minimize any belt slack in the pelvic and shoulder region in the event of a crash. The seatbelt tensioner is located on the drivers and/or passenger seat. In combination with the mechanical force limiter in the inertia reel, this reduces the chest load for the seat occupants.





If the rear side airbag option is installed, seat belt tensioners are installed at the rear left and right as well. The seat belt tensioners form a unit with the seat belt buckle. In combination with the option, the inertia reels have mechanical force limiters.
Technically, the front and rear seat belt tensioners are identical. The seatbelt tensioners consist of igniter pellet, generator, plunger and operating cable.
In the event of a crash of sufficient severity, the gas generator is ignited. The gas spreads and shifts the plunger in the tensioning pipe. The cable connected to the plunger thus pulls the seatbelt buckle downwards and takes the slack from the seat belt.
The belt buckle switch is integrated in the seatbelt buckle. The rear seatbelt buckle switch is used to check whether the seat is occupied and evaluate this information.