Auto-dimmer works with two sensors... - Saab 9-5 Bulletin Board - Saabnet.com
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Auto-dimmer works with two sensors...
Posted by Kurt (more from Kurt) on Wed, 24 Dec 2008 11:09:02
In Reply to: I find the effect is subtle / or is mine broken?, Nemo, Wed, 24 Dec 2008 10:07:43
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one in front and the other in back of the rear view mirror. When front-to-back light differential is greater than the set point (i.e. high beam from behind the car), it activates dimming. Typically side mirrors work in conjunction with the rear view mirror, sharing the same sensor.
You can see this easily, just cover the back-facing photo sensor with a thumb while driving at night, and dimming goes away, even when the lighted object is in the mirror.
So it is not the mirror itself that reacting to the light, so dimming may diminish when the front sensor sees as much light as in the back.
posted by 76.234.153...
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