Ford Focus Forum, Ford Focus ST Forum - View Single Post - Auto-dimming mirror does not work
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Old 02-13-2011, 09:24 PM   #6
00CSVT
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I installed an auto-dimming/compass mirror in my 07 and have installed several of them. Most of what you will find are manufactured by Gentex and the pinouts can be found online.

You should be able to unhook the connector and check to see if there is voltage across pins 1 and 2 easily enough. Also, if pin 3 has power it will disable the auto-dimming function (reverse).

Here's the typical pinout...
PIN 1 POWER +12 volts
PIN 2 CHASSIS, GND
PIN 3 REVERSE SIGNAL
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