If I were you I would not remove the airbag until you have checked for a feed and return on the HORN wire going to the wheel, just don't confuse horn with airbag, which should be YELLOW WIRES ON AIRBAG, be careful, they can cause injury.
The reason I say this is because you may find it is a loose connection not in the airbag, you could always just bridege the horn wires to see if there is anything, the HORNS do regularly pack up, but have a screw on them and can be retuned back in sometimes, so worth a look first.
tabetha