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Interior and Upholstery New Member auto dimming mirror install issue

  • Thread starter Thread starter WigSnatcher92
  • Start date Start date Aug 25, 2025
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WigSnatcher92

New Member
Aug 20, 2025
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0
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Columbia Tn
Aug 25, 2025
#1
  • Aug 25, 2025
  • #1
Hey y’all new to the forum and mustangs as well. So here’s the situation I’m trying to install a Gentex 221 autodim mirror with compass, temp and map lights in my mom’s ‘02 Convertible. It has a six pin connection (Temp -+ violet, ACC red, 12v orange, map lights white, and ground black). I have the ACC hooked up to the radio fuse, the 12v to blue/white, map lights to green/orange wire and ground to ground. This is where I’m at a loss cause the mirror only turns on when the door is open. Everything but the map lights turns on when the door is open, I can press the button for the light and they’ll come on, but not when they should be triggered with the door. I swapped over the Bl/W and Gr/O wire and that only makes the mirror stay on constant. I haven’t seen if the mirror turns on if I turn the headlight switch to dome. My next steps are probably is running the map light wire to the ACC and have LED strips at the footwells and under the seats. Any help would be appreciated.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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Massachusetts
Aug 28, 2025
#2
  • Aug 28, 2025
  • #2
I have one of those in my convertible. I can't see which variant of the 221 you have, as there are 4.

I think it's one of the temp ones, but unsure if single line or dual line.

I 1 I 2 I 3 I 4 I 5 I 6 I 7 I
I_____________________I

GNTX-221 - Map Lights Only
1 - +12V Switched-RUN/START
2 - Ground
3 - Reverse Feed (+)
4 - Door Mirror Feed (+)
5 - Door Mirror Feed (-)
6 - Door Switch (-)
7 - Fused B(+)

GNTX-221 - Map Lights & Compass
1 - +12V Switched-RUN/START
2 - Ground
3 - Reverse Feed (+)
4 - Door Mirror Feed (+)
5 - Door Mirror Feed (-)
6 - Door Switch (-)
7 - Fused B(+)

GNTX-221 - Map Lights, Compass, & Temperature - Single line display
1 - +12V Switched-RUN/START
2 - Ground
3 - Reverse Feed (+)
4 - Temp Sensor (+)
5 - Temp Sensor (-)
6 - Door Switch (-)
7 - Fused B(+)

GNTX-221 - Map Lights, Compass, & Temperature - Dual line display
1 - FUSED B(+)
2 - Door Switch (-)
3 - Temp Sensor (-)
4 - Temp Sensor (+)
5 - Reverse Feed
6 - GROUND
7 - +12V Switched-RUN/START
Click to expand...

IIRC, and going off another post, the stock mirror wiring is 3 wires. Colors changed, but one is ground. One is key on/ACC 12V and one is switched power when a door is open (to turn on the map lights).

I ran new wires for mine, but which mirror do you have?
 
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