I posted this as a reply in another thread. I scoured the internet for the information on the GNTX-221 dual display version. I was unable to find anything accurate. I disassembled all four of the GNTX-221 variants and did some detective work tracing PCB paths. I then reassembled the mirrors and electrically tested my data. This is the result.
I have identified four different versions of the GNTX-221 mirror:
Map Lights Only
Map Lights & Compass
Map Lights, Compass, & Temperature - Single line display
Map Lights, Compass, & Temperature - Dual line display
The first three have almost the same connector pin-outs. The ones without the temperature display appear to have the feeds for side mirror dimmers. The ones with temperature display have inputs for the temperature sensor in place of the side mirror dimmer feeds.
The dual display is different.
Here are the pin outs:
I I
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
IF anyone finds any errors, please let me know.
I have identified four different versions of the GNTX-221 mirror:
Map Lights Only
Map Lights & Compass
Map Lights, Compass, & Temperature - Single line display
Map Lights, Compass, & Temperature - Dual line display
The first three have almost the same connector pin-outs. The ones without the temperature display appear to have the feeds for side mirror dimmers. The ones with temperature display have inputs for the temperature sensor in place of the side mirror dimmer feeds.
The dual display is different.
Here are the pin outs:
I I
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
IF anyone finds any errors, please let me know.