Seat Belt Tensioner: Description and Operation

COMPONENT PARTS

Front Seat Belt Pre-tensioner






The seat belt pre-tensioner system with load limiter is installed for both the driver's seat and the front passenger's seat. It operates simultaneously with the SRS air bag system in the event of a frontal collision with an impact exceeding a specified level.
When the frontal collision with an impact exceeding a specified level occurs, seat belt slack resulting from clothing or other factors is immediately taken up by the pre-tensioner. Vehicle passengers are securely restrained.
When passengers in a vehicle are thrown forward in a collision and the restraining force of the seat belt exceeds a specified level, the load limiter permits the specified extension of the seat belt by the twisting of the ELR shaft, and a relaxation of the chest-area seat belt web tension while maintaining force.
Some models with Pre-Crash seat belt control systems have front seat belt pre-tensioners that contain a seat belt control unit and motor as part of the pre-tensioner assembly (if equipped). Pre-crash seat belt motors may
Revision: March 20122013 Infiniti JX
operate before a collision actually occurs as well as when the doors are opened or closed. For further information on the Pre-Crash seat belt system refer to "System Description" System Description.