What does it mean when the airbag indicator flashes on and off on a 2004 infiniti g35?

If your talking about the airbag indicator that's to the right of your clock, then it is just the indicator of if it is on or off. The airbag will turn off if no one is sitting in the seat or if a small child is sitting in it, and will turn on if an adult is sitting in the seat. It can tell the weight difference, and then the indicator will flash depending on if it's on or off. It will flash if you have something sitting on the seat.