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just had the same problem.
parking lot I was in got flooded in a sudden, intense thunderstorm on Sat. about an inch of water under the drivers seat. I did similar, but put the circuit board in a box of dry rice overnight. put it all back together today and it works except that the key fob won't open the trunk or hood, or arm/disarm the alarm. the red receiver light on the dash lights up when I press the buttons, but no reaction from the car. also, the central locking doesn't work, and the hood/trunk releases only work when the ignition is on. otherwise it seems to start and run with no issues and it isn't doing the crazy hood/trunk unlocking randomly, alarm going off etc.. that it was doing when it was wet. just filed a claim with insurance to see if they will pay for it getting fixed.
btw, your airbag light may be on because you had the seat unplug when the battery was connected (happened to me once). it take a durametric tool to reset it. my shop did it for free, but the dealer will probably charge you.
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