I have no idea. I'm pretty unfamiliar with the airbag system, mine never tripped up and I even got it inspected by the dealer 10 years after the manufacturing date as the owner's manual and sunvisor indicate. However, this is no longer necessary/suggested for "standard scheduled maintenance" as mentioned in
NTB01-057 - REVISED MAINTENANCE PROCEDURES.
If it turned off and doesn't reappear, I'd chalk it up just to a random glitch. If it reappears, try to note down the number of flashes it gives or whether it just keeps on flashing.
Does your horn work?