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...dunno, but I've also wondered that....it may be a temperature sensor for the interior of the car ???
 

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might be the solar sensor?
 

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Gents,

That is a light sensor. It automatically dims the IHKA screen when it's dark outside.

Try covering it for about 20 seconds one day during the day. The screen will dim way down because it thinks it's nighttime, and you won't be able to read the display due to the low brightness.

Another reason the stock cupholder sucks -- when you put a cup or even water bottle in the right side cupholder (in front of the light sensor we're talking about here) it will dim the display way down...
 

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Another reason the stock cupholder sucks -- when you put a cup or even water bottle in the right side cupholder (in front of the light sensor we're talking about here) it will dim the display way down...
And if it is a hot coffee the A/C will try to compensate and blow cold air!!
 
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