I just purchased a Gentex Compass/Temp Auto Dim rearview mirror from Vinnie and installed it in my 08 Mustang. I thought it would be appropriate to post wiring diagram information for others so it would be at your fingertips if anyone ever needs the info.
There are two Gentex mirror plugs. Some are 7 pin and some are 16 pin. Wire colors may vary but pin positions are consistant.
Gentex 7 Pin Mirrors:
Gentex 16 Pin Mirrors:
1- Not used
2 - (Not used) Microphone (if the mirror is equipped with it)
3 - (Not used) "Passenger Air Bag on" notification (if mirror is equipped with that display)
4. -(Not used) "Passenger Air Bag off" notification (if mirror is equipped with that display)
5 - (Not used) If equipped with auto dim side view mirrors, supply line which goes to the LH outside rearview mirror.
6 - (Use) Temp probe connection (if mirror is equipped with display).
7 - (Use) Temp probe connection (if mirror is equipped with display)
8 - (Use) Ground
9 - (I did not use) Auto Dim Inhibitor while in Reverse (hook up to back-up lights)
10 -(Not used) Microphone (if mirror is equipped)
11- (Not used) If equipped, keypad signal (out) for On-star (pressing any button puts out a 5v multiplexed signal on this pin, You cannot use the buttons to control whatever you want to.)
12 - (Not used) Onstar Equipped keypad supply (5v) voltage (in) for the buttons
13 - (Use) ignition voltage (12v -main power IN to the mirror)
14 - (Not used) Onstar equipped keypad green LED signal
15 - (Not used) Onstar equipped keypad red LED signal
16 - (Not used) If vehicle equipped with auto dim side mirrors, return line to the LH outside mirror for day/night signal.
If you have a mirror that is equipped with the temp display be sure to use a sensor designed for the mirror. It is a common GM style sensor but may be used on other makes as well. Do not use the temp sensor from any vehicle that has as roof console display such as the Ford Explorer. Those sensors are not calibrated for use with the Gentex mirrors.