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      06-22-2013, 09:34 AM   #6
Otruba_843's Avatar
Drives: 2009 E90
Join Date: Feb 2012
Location: Charleston, SC

Posts: 1,454
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Yup, the rear facing sensor in the middle picks up light and when it senses light it dims the mirror. The sensor on the front passenger side picks up the darkness to compare the lights that the rear sensor senses telling it when to dim.
2009 E90 328i Monaco Blue
premium/idrive/convience/logic-7/cold weather/ xenons/ saddle brown interior
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