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Looking in the shop manual it's used as a temperature input to the HVAC and the PCM, so it likely displays the outside temperature on the HVAC display.
It looks by the wiring diagram the wiring for that is included in the harness that comes out of the mirror. Pins 30 and 31, Yellow/green, and Yellow/violet.
Hope this helps.
Could you do us a little favor and size down that sig pic a hair? It's pretty hard to read with a picture that big.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.
Last edited by Big Angry Hillbilly; 04-29-2013 at 10:19 AM.