Rear View Mirror sensor - Acura MDX Forum : Acura MDX SUV Forums
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post #1 of 3 (permalink) Old 11-30-2012, 12:34 PM Thread Starter
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Rear View Mirror sensor

Does anyone know what is the sensor behind the rear view mirror (comes with navigation system)? I know the front's bottom right is the auto dim sensor, but there is one on the back of the mirror.

I want to know if it is ok to put an EZ pass on the glass around that spot.

Any insight would be helpful. Thank you.

Car Model: 2013 MDX Advance

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post #2 of 3 (permalink) Old 12-01-2012, 09:44 AM
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Pasted from a web site which sells mirrors

Q: How do Auto Dimming Mirrors work?
1. A forward-facing sensor recognizes low ambient light levels and signals the mirror to begin looking for glare.

2. A rearward-facing sensor then detects glare from the vehicles traveling behind you, sending voltage to the mirror's EC gel in proportion to the amount of glare detected.

3. The mirror dims in proportion to the glare and then clears when the glare is no longer detected.

4. The interior mirror's sensors and electronics control the dimming of the mirrors.

That didn't make much sense to me until I also found this explanation on another web site forum which makes more sense about the function of the front sensor.

I haven't checked but I think you are correct. The mirror "knows" how much to dim by sensing light from in front and from behind. When there is relatively a lot of light from the front, the mirror doesn't darken as much even if there are headlights from behind you, as it assumes you are in a well-lit city street or in daylight, so that you can still see things. When the front sensor senses "dark," it will assume you are out on a dark highway, where it's more important to darken the mirror so you are not blinded by approaching headlights from behind.
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post #3 of 3 (permalink) Old 12-04-2012, 02:18 PM Thread Starter
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Thank you.
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