While driving at night, rear view interior mirror does not dim as traffic approaches from rear. When taken to dealer, technician shined light from iphone onto mirror and it dimmed properly. However, under normal driving conditions it does not! on a recent 2 hour nighttime drive, as car lights approached from behind, I alternately turned the dimming feature on and then off and noticed absolutely no difference. I even tried it when stopped at red light with headlights from several cars behind me, with the same result. Since there is no lever to use to dim the traffic as there might be with a non-electronic mirror, I was forced to lower the mirror to avoid being blinded by cars approaching from rear - an obvious safety situation. Dealer says there's no problem but has not tried in real life driving.

- Hartford, WI, USA