Oh, found my own answer:
https://www.renntech.org/forums/topic/41177-airbag-fault-code-45/ and
https://www.renntech.org/forums/tutorials/article/236-seatbelt-airbag-light/
BUT, I do have a follow-up someone might be able to answer: If the airbag light is on because of the driver's or passenger's side buckle error will the respective airbags still deploy? In other words, until I do the fix (see links above) am I driving around with no driver's airbag? I don't understand why the airbag would care if the seat belt is being detected as buckled or not. It would seem to me that the airbag should deploy regardless.
Thanks for your thoughts!