What Troy said.
As soon as an Airbag deploys, you need to put in a new module. otherwise the airbag system is off. so that would fail the system right away.
if its in the passenger side, i believe you just unbolt the old bag, and put a new sealed one in.
if its the drivers side, you just need a new Horn pad.
whenever you mess with ANYTHING airbag related, disconnect your battery.