I had the same question just after my wife and I got our '05 Elantra.
It takes 120 pounds to turn off that light. I doubt that you have that much
weight in school books.
So, yes that light is going to stay on unless you have a passenger in that
IIRC, the airbag is supposed to turn on (the light shuts off) if there
is 55 pounds or more in the seat. If there is less than that, the light
should be on, indicating that the airbag is off. If the seat is empty,
the light should be on, which means it's on most of the time.
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