Door Airbag Module Exposed
Had the opportunity to work on a late-model BMW recently. After removing the interior driver's door panel, we were able to expose the door-mounted airbag inflator module. It sort of resembles a stereo speaker unit. It has a stored gas inflator cylinder within the unit itself.
Note the familiar yellow color wire connector. That is the thin wiring that powers the airbag when it is time to deploy.
Door-mounted airbag units will be found 1) above the armrest and 2) towards the latch end of the door.
Here are two images of the airbag unit...