Rear View Mirror sensor - Acura MDX Forum : Acura MDX SUV Forums
 
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post #1 of 3 (permalink) Old 11-30-2012, 01:34 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, 10:44 AM
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Pasted from a web site which sells mirrors

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

A:
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.

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

A:
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, 03:18 PM Thread Starter
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Thank you.
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