Posts Tagged: seatbelt pretensioner failure

Seatbelt Pretensioner Failure: Symptoms, Causes, and Repair

How a Seatbelt Pretensioner Works During a Crash Quick Summary A seatbelt pretensioner’s job is simple but extremely important: it instantly tightens the seatbelt during a collision, pulling the driver or passenger firmly into the seat before the airbag deploys. This reduces forward motion and improves the airbag’s effectiveness. Modern vehicles use either retractor-mounted pretensioners, buckle-mounted pretensioners, or a combination of both. Each design uses a small pyrotechnic gas generator—similar in concept to an airbag inflator—to rapidly retract the belt. The most important thing to understand is this: a deployed … Read More