1. The gas generator emits a spark when a signal is received from the SAS control module, causing gas to form.
2. The gas pressure pushes the piston inside the tube, pulling the lead wire.
3. As the lead wire is pulled, the part of the buckle attached to the wire is also pulled.
4. The slack in the belt is tightened due to the buckle being pulled and the seat belt ELR mechanism, safely restraining the driver and front seat passenger.
1. When a force of approx. 20 kN {2039 kgf, 4496 lbf} is applied to the buckle after pre-tensioner activation, the lead wire is clinched by the cam to lock the buckle so that the belt does not extend.
2. The restraint force of the seat belt is adjusted by the front seat belt load limiter mechanism, preventing injury to the driver and passenger due to seat belt pressure.
