Passenger-Side Air Bag Module
WARNING: This page is about a different car, the 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
When sensors close, signaling an impact, air bag igniters trigger inflator. Since passenger-side air bag is larger than driver-side air bag, inflator contains more gas generant in different configuration to produce more gas. When air bag is activated, air bag cover and instrument panel tears at fracture lines, allowing air bag inflation.