Sephia LS Sedan L4-1.8L (1998)
Air Bag: Description and Operation
Driver is protected by a steering wheel mounted air bag. Air bag-Supplemental Restraint System consists of Air Bag Module, Air Bag Diagnostic Unit,
and wire harness & clock-spring assembly.
Driver Air Bag module consists of bag cover, air bag, retainer ring, retainer housing, and inflator. Passenger Air Bag module consists of deployment
door, bag assembly, inflator, and retainer housing. Because of size difference, passenger air bag module incorporates a larger, tubular shaped inflator.
The driver air bag cover is mode of TPE (Thermos Plastic Elastomer), and it splits along tear seam in case of a collision. Air bag is made of Nylon 66,
and face contact surface is coated with silicone. A vent hole is provided at back side of air bag to deflate air bag immediately after its inflation not to
block driver's sight. Inflator produces nitrogen gas by igniting solid propellant pellets inside inflator. Ignitor is triggered by electrical current and ignitors
ignition intensifier, which in turn ignites propellant pellets. Heat sink and filter cools and filters nitrogen gas as it enters air bag.
Clock spring assembly is incorporated into combination switch to provide a positive connection between vehicle wire harness and driver air bag module
while allowing sufficient rotation for vehicle steering. This assembly is also replaced as a complete assembly only.
