Driver-Side Air Bag Module
WARNING: This page is about a different car, the 2002 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
Dual-stage air bag module consists of an inflatable air bag, 2 gas generators and 2 igniters. Air bag fully inflates in about 35 milliseconds. Gas is then released through a filtered vent on the side of the air bag, causing it to deflate.