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The build sheet for my wife's 2015 RX350 describes the rear-view mirror as auto-dimming. It does not mention either side mirror as being auto-dimming. Perhaps they indeed are, but I rarely drive it and have never noticed.
Same issue with me (2013 RX350), except that passenger mirror dims very slow compared to rear view and driver.
I am not sure if this a flaw or by-design from Lexus.
My older 2007 IS300 machine has all mirrors dimming the same speed but in general is slower than newer models......
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.