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I dont want to say I know the answer as I just purchased my Highlander,but my past experience with vehicles and water is that there is often a drain hole and or vent in the light assembly, it sometimes has a rubber tube attached to it and if it gets clogged (even a small amount of dirt could do this) it will allow water to collect. It is also possible that the plastic lens is cracked or the seam between the lens and the housing has separated. It only takes a small crack to let water in especially with the amount of rain we have had in VA lately. If you remove the taillight and clean it and carefully blow some compressed air into anything that looks like a drain or vent and then inspect for any cracks, maybe, hopefully you will find the answer. Hope that helps  

I have a 2018 Camry Hybrid LE.  When moving the screen that allows access to USB and CD music is not available. This means that to select the album I want I have to pull off highway and select new album, and then start moving again; or play the music from my phone which is even dumber, or try to select with the buttons on the steering wheel or dash dumber still. I have read in other forums how to disconnect the speed sensor to the radio, but have not found it for the 2018 Entune plus radio. Anyone know were the sensor input is to the radio???    

With a little online exploration, it would appear that the problem lies in the integration relay, and that it would have to be replaced.

The Dark Knight 

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