It's not anywhere near the dash.
In a coupe, it's on the passenger side where the back seat passenger would be sitting. To the right is the plastic panel (the one where the speaker grill is attached to).
That entire panel has to be removed, it's a pain because it goes all the way back into the trunk. Right in front of the speaker is the airbag module. I'll see if I can find a pic for you.
EDIT AGAIN AGAIN
: No idea where it is on a sedan though.
EDIT AGAIN: I found the better pic. It's that grey box thing that the arrow is pointing at.