Quote:
Originally Posted by gatojurko
So...what is red circle there? I have HBA as well in my car!
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LOL...why is the sensor circled in red confusing so many forum members? It is as been stated repeatedly when asked...it is one of the two EC (electro-chromatic) auto dimming sensors.
The original poster correctly identified the "black dot" on the face or the interior rear view mirror...but kept rejecting/ignoring the explanation of the EC's ambient light sensor on the back side of the mirror (faces the windshield and is the one circled in red).
The auto dimming of the interior rear view mirror (and the side mirrors if optioned) uses both the front and rear facing sensors to operate with in its prescribed parameters. The sensor (circled in red) which faces the windshield is an ambient light sensor...it regulates the intensity at which the auto-dimming will occur. The ambient light sensor will adjust the dimming parameters lighter or darker when headlights from a vehicle behind the car shine on the sensor embedded on the face of the mirror. The dimming affect is not as dark when in an urban/city environment with well lit streets versus a dark unlit road/highway.
You can see the ambient light sensor in the same location of an interior EC mirror used PRIOR to the additional technology of high beam assist and rain sensors, etc:
{EC mirror's ambient light sensor...same function as sensor circled in red on the newer EC mirror pictured by the OP in this thread}
{EC mirror's front sensor (black dot) that detects headlights from behind the vehicle}
