I had to re-pin the factory mirror harness in to use the dual display GNTX 177 from a 2001 Chevy truck. I used the wire diagram on the first page and the factory service manual.
According to the factory service manual:
Black/Light Blue - Temp sensor ground
Violet/Light Green - Temp sensor
Pink/White - Constant 12v
Dark Blue/White - Fused ignition
Black/Light Green - Ground
Violet/Black - Back-up Lamp Feed
Yellow - Courtesy Lamp
I changed the order to this:
1 - dark blue/white
2 - black/light green
3 - violet/black
4 - pink/white (no power)
5 - yellow (no power)
6 - violet/light green
7 - black/light blue
The Pink/White and Yellow wires are not used, so I disconnected them from the dash harness so they wouldn't be powered.
First remove the white clip on the connector
Use a eyeglass flathead screwdriver, pull up on little tab and remove the Pink and the Yellow wires.
Reconnect white clip and reconnect wire harness
It works like a champ