Does anybody know a way to calibrate the sensitivity of the auto-dimming mirror? Prius owners like us are likely to go blind. In this world of SUV's, we're all in perfect line-of-site of their headlights. I'd like my mirror to dim when sensing less brightness from headlights. How can I turn up the sensitivity? Thanks!
http://john1701a.com/ has information on that. Basically you put a blue piece of transparent plastic over the sensor in the front of the rear view mirror (makes it think it's darker). Another suggestion is a piece of electricians tape covering about 3/4 of the sensor.
I covered the entire sensor on the windsheild side of the wirror. It does get really dark once you turn the car on, but I simply turn the mirror off so it goes back to normal. At night I turn the mirror back on. It NEVER gets dim enough in my opinion.
Rather than blue tape I suggest getting some scrap window tint material of various darkenesses from a local installer and taping on or more layers of those over the sensor until you find one that gives the degree of dimming you desire. Alternatively, I have a parking tag that's designed to be hung from the rear-view mirror. A happy side effect of using that hanger is that it blocks a large amount of the light to the sensor causing significantly strong dimming than before.
