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The water could be a part of the issue. The only way to find out is to get at the ECM and check it over for signs of water damage. DO NOT disconnect or reconnect the ECM with the battery connected.
Water down in that area could be caused by a number of things. The ones that come to mind are.
1) The drain for the ac is clogged so the water is emptying inside the vehicle.
2) A leak in the heater core (though it would smell like coolant)
3) a missing or broken plug in the floor or firewall (usually about 1" around and plastic)
4) A leak in the windshield. The adhesive/sealant gets old and brittle as well as corrosion can cause the paint and sealant to lift and allow water through (I have this problem in my Frontier, but just haven't had time to fix it).
5) a leak in the rubber boot between the floor and the shifter. I'm not sure how the automatic is put together as I've never had mine off, but the manual in the frontier has a rubber mat with a boot on it to keep out the elements, and then the more ornamental rubber boot that you actually see inside the vehicle. Over time the rubber can get brittle and allow water from the road to splash up and get inside the vehicle.
Water down in that area could be caused by a number of things. The ones that come to mind are.
1) The drain for the ac is clogged so the water is emptying inside the vehicle.
2) A leak in the heater core (though it would smell like coolant)
3) a missing or broken plug in the floor or firewall (usually about 1" around and plastic)
4) A leak in the windshield. The adhesive/sealant gets old and brittle as well as corrosion can cause the paint and sealant to lift and allow water through (I have this problem in my Frontier, but just haven't had time to fix it).
5) a leak in the rubber boot between the floor and the shifter. I'm not sure how the automatic is put together as I've never had mine off, but the manual in the frontier has a rubber mat with a boot on it to keep out the elements, and then the more ornamental rubber boot that you actually see inside the vehicle. Over time the rubber can get brittle and allow water from the road to splash up and get inside the vehicle.