Air Bag Modules

An inflator assembly in the air bag module produces nitrogen gas to fill air bag. See Figure . When a small amount of current from SRS-ECU is applied, ignitor starts a thermal reaction, which spreads to a pellet-filled canister that produces nitrogen gas. Gas pressure builds and discharges from inflator through a diffuser and screen assembly, forcing trim cover to burst along its seams until air bag is fully inflated. When air bag is fully inflated, gas escapes through vents on sides of air bag.