I bought my car new in December 2016. My auto dimming mirrors don't appear to be working. (I'm not a fan of auto dimming mirrors because they never get dark enough for me on any car I've driven). In an effort to test the system I covered, with my hands, what I believe to be the sensor on the left/back side of the rear view mirror as well as the sensor on the left/reflective side of the mirror and nothing happens, no dimming. I'm doing this in bright sunshine. I've covered the back side only, the mirror side only and both at the same time. Does this indicate the auto dimming feature is not working or am I not testing it properly? The car is on and in drive during my testing. Not driving while testing. <grin>