Passenger airbag light turned on (Honda Civic)?

I mistakenly left both my front windows rolled down in my 2012 Honda Civic hybrid during a rainstorm and now the "passenger airbag off" light is on, even though nobody (and nothing) is sitting in the passenger seat. The front portion of my car got pretty wet by the time I realized it (I d guess about 20-30mins of straight heavy downpour). What gives?

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