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Mine works intermittently also. I works when it gets cold or wet(yes) in the summer months it doesn’t work at all. I took it the Lexus the told me the sensor in the back is corroded and needed to be changed to the tune of $430. I have been meaning to buy it or take a look at the one on there now. The problem started occurring in summer last yr. I just purchased the repair service manual to help me put on my passenger mirror. Therefore that sensor will fixed/repaired as soon as it gets warm.
Thanks, yes mine works in the opposite, does not work when its wet.
It first happened I think when I put my Jetski in the water and the rear of the car was pretty far in the water. I guess it is the sensor.
there most be a place to get the part besides the local Lexus dealer>
Do you know the real name for the sensor? maybe can do a search for one online?