Mine is to the right of the air bag - all the way to the right and next to the outside fender. Mine is wrapped in grey foam and is about the size of 2 sticks of butter (quite small).

Basically you could remove the air bag, then stare and look to the right and not see it! The foam makes it blend in.

And VERY slow suction of air into it - intake located at the top front center of ceiling. Use a cigarette or smoking burned out match so you can see the smoke get sucked into it. Not strong enough to suck a tissue up against it.