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Did you power wash them? I had that issue on my passenger mirror. Took it all apart and put it back together again. It worked. I don’t think I did anything to fix it. I think it just dried out and a couple off an one with the car got it working properly.
I did remember spending a few extra seconds with the power washer though on that mirror.
On my 2017, taking that mirror apart really impressed me with how it was put together and wired and wrapped and wrapped.