Another reason the airbag light might be on is if you turned your ignition to the on state while the airbag was disconnected. I did that when I replaced my multifunction switch in the steering column. I wanted to test the switch before installing everything back. I have a micropod II DRB III emulator that worked to reset the error code. I think you can get them for ~$140, but you need a computer to drive it. Another member posted a virtual machine with all the DRB III software installed (you still need the micropod).
Good luck, sincerely
-Jerry