Air Bag Modules
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Air bag modules consist of an inflatable bag and an inflator. When vehicle is in a collision of sufficient force, SDM causes current flow through deployment loops of applicable air bag modules. Current passing through inflators ignites inflator charges, producing gas which rapidly inflates air bags.