Other than you-N-me, I don't recall anyone with the airbag light coming on (so you might not get many responses to your question).
I'm thinking mine is caused by sensor damage after my accident (even though it didn't come on till a year after).
Careful putzin around with any relay on the airbag circuit. Make sure you have the battery disconnected. Don't want to accidentally set off the airbags.
I'll have a look in the 'lectrical troubleshooting manual & get back to you.