The mirrors on this Jeep do not dim when cars behind have even REALLY BRIGHT headlights on. Of course driving at night on an interstate is problematic. The windows are not tinted and are clean. Today during daylight hours I did some testing following suggestions from the forum. I taped over the front facing sensor on the rear of the mirror so it thinks it is night. As it is daylight and vehicle is outside the light in the rear is much brighter. Start up the car and all three mirrors... 2018 JGC Overland Auto Dimming mirror problem/saga/mystery!