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?

Water got into the passenger presence detection sensor in the passenger seat.

The water probably shorted something out, and it could get worse. There's a sensor in the seat that tells the car if there's a passenger there or not, and that's what controls the light. Try these steps to dry out the car:
1) Open all doors and windows
2) Use a wrench and disconnect one of the battery terminals under the hood (cuts off all power to electronics)
3) Get a few fans (one around the house will work, or box fans are pretty cheap at Walmart), and set them up blowing through the car
4) Let it sit that way for a few hours
5) Reconnect the battery, and see if the problem is fixed.

If this doesn't fix it, you'll need to take it in for repair.

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