Altima 2.5 SL L4-2.5L (QR25DE) (2002)
Seat Belt Pre-Tensioner: Description and Operation
Front Seat Belt Pre-tensioner with Load Limiter
The seat belt pre-tensioner system with load limiter is installed for both the drivers seat and the front passengers 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.