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Hello. This is an extremely common problem on your model vehicle. It happens to nearly every single one. What is happening is the windshield is leaking. The water is running down the pillar and onto the GEM module. The only fix is to remove the windshield, clean up the rust and re install the windshield. Please let me know if that helps you at all.
I should add, the gem module is located under the dash on the driver side.
Usually they do dry out and work fine again until the next rain. We get expeditions in here all the time that have caulk squeezed into the corner of the windshield, but don't try it. It won't fix it.
sometimes, if the leak has just started, it will only happen during heavy rain falls, but after a while, the leak gets larger and larger and then a small rain fall will cause these issues.
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