Rain damage to seat heater

I recently left my sunroof open and it rained… allot. Originally the passenger seat heater stopped working including the light. Driver side is fine. The door sensor on the drivers side than unlocks the door stopped working too. After two days of running the car with the heat on the door problem went away but the seat still will not turn the heater on.
Toyota wants 89$ to diagnose. Is there anything I can do to troubleshoot first? I’m assuming I blew the heater altogether but though I would check here first.

 

I would assume that if water shorted something than it was supposed to blow a fuse. If passenger seat heater has it's own fuse and it's good I would wait few more days hoping that water evaporates completely. I would assume that seat can hold more water than door sensor. Other than that maybe somebody have some instructions how to remove seat and check heater.

 

There are four things that could potentially stop working.
The seat heater fuse below the steering wheel next to the door.Simple to check.
The seat heater switch and the switch module below the center dash piece. Just pop the dash piece out and it will give you an idea if there is water damage.
The seat heater module below the seat itself. It's a tight fit but it's a white little box with a connecter next to a yellow airbag cable.
If one side is working swap out the parts to see if it works. And order parts that are faulty.
But if the seat heat filament itself has gone bad, there is nothing you can do other than ripping the seat apart and put a new one. Very very expensive and not worth it.

 

I would be more worried about mold and odor. I can live without a warm ass, but not sure I can live with a potential biohazard. Either way, I would pull the seat, carpet, padding, and anything that can absorb water and have it professionally cleaned. Then worry about electrical issues. A "water damage" title doesn't do much for resale.

 

If I was troubleshooting this, my focus would be on the seat heater switches in the lower console rather than the seats themselves, since they are directly under the sun roof.

 

I'd suspect the switch on the console might have failed. Of course check fuses first. But remember, fuses don't "just blow". They indicate somethin's wrong.

The driver's side seat heater switch in my '15 SR5 went bad, I got coffee in it... a lot of coffee... It wouldn't shut off, so different problem. But it is highly possible that you could have a bad switch that resulted in a blown fuse. those switches seem flimsy to me