Driver-Side Air Bag Module
WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Driver-side air bag module is mounted on top of steering wheel. When sensors close, signaling an impact, ignitor triggers inflator. During ignition, sodium azide reacts with copper oxide, producing nitrogen gas, which inflates air bag.
When air bag deploys, tear-seams molded into steering wheel trim cover separate, allowing deployment of air bag assembly. Driver-side air bag module is not serviceable and must be replaced as a complete assembly.