My 02 had the airbag light on when I got it (or shortly after) I read something about the front sensors and wiring for them being an issue. Bought the ACM off eBay for an 04 (deletes the front sensors) search for airbag light. My light has been out ever since. (Still works normally on startup and stuff). Might not be your issue, I would say go to a dealership or some place with a good scanner to pull the codes. If it says front sensor I would get an updated ACM. But that's just me.
when I replaced the radiator I found that the PO had been in a fender bender, the front bumper was crumpled in and just barely touching the A/C condenser. That was probably the reason does my airbags light