Side Curtain Air Bag Module
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
The side curtain air bag module and inflator is mounted under headliner over front and rear doors. It contains a squib, igniter charge and gas generant and inflates the air bag when instructed by respective rear air bag sensor.