Passenger-Side Air Bag Module
WARNING: This page is about a different car, the 2001 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 a 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.