Of course there is a way to remove the seat, but you didn't ask
Remove the 4 bolts securing the frame. If you can't access the bolts due to seat position, you'll have to figure out a way to move it. No easy way comes to mind, so you'll probably just have to be creative. Once you get it out, remove and thoroughly clean the immobilizer unit. Check all contacts for corrosion, including the onboard fuse.
Clear the drain lines to prevent future water infiltration. There are numerous posts on the moisture subject along with remedies.