Perimeter blind spot monitor – Chrysler Town and Country 3.6 2014

My blind spot monitoring, becomes disabled, and the right mirror lamp illuminates after washing the car or driving in a rainstorm. The problem resolves itself in a few weeks of drying out. I have looked at the connectors to both modules in the rear fender, but was wondering where else I might look for a bad connection.to both modules in the rear fenders, but was wondering where else I might look for a bad connection. I have alsoI have also cleaned the connectors and applied dielectric grease but no improvement. cleaned the connectors and applied dielectric grease but no improvement. I have also used a spare module to troubleshoot each one to see if there was water intrusion in the module.Neither one seems to be the problem so there must be a failed connection somewhere else in the system. Just not sure where to look.

Brand: Chrysler
Model: Town and Country
Year: 2014
Engine: 3.6