Express 3/4 Ton Van V8-4.8L VIN V (2003)
Seat Belt Tensioner: Description and Operation
INFLATABLE RESTRAINT SEAT BELT PRETENSIONERS
The seat belt pretensioners contain a housing, an initiating device, and a canister of gas generating material. The initiator is part of the seat belt
pretensioner deployment loop. When the vehicle is involved in a collision of sufficient force, the SDM will cause current to flow through the deployment
loops to the initiator. Current passing through the initiator ignites the material in the canister producing a rapid generation of gas and the release of
compressed gas, if present. The gas produced from this reaction rapidly shortens the seat belt buckle height.
Each seat belt pretensioner is equipped with a shorting bar located on the connector of the pretensioner. The shorting bar shorts the seat belt pretensioner
deployment loop circuitry to prevent unwanted deployment of the pretensioner when it is disconnected.
