Since the Miata is the 5th car in my family, I've run out of garage remotes and moving a remote from one of the other cars is getting a little annoying (especially when I forget to do it) so I thought it might be a good idea to find a homelink mirror on Ebay with only dimming and homelink functionality. There are some models that have a compass and I believe a backup camera monitor.
After doing a little research, it appeared that there are basically 2 popular models, the GNTX 313 and 453. Depending on what car you search for, you might find it cheaper. The 313 is the older model so my advice is to avoid the 313 if you can and look for 453 (also known as OBIHL3).
The wiring colors are all dependent on the car the mirror is pulled from. I found my mirror on ebay for $38 with free shipping and it came from an 08 Nissan Maxima.
When shopping, you should look for unworn buttons and the plug with wire harness attached. No matter what color wires you get, the pins are the same between the 313 and 453.
from the back of the plug with the wires facing you and the push lock at the top:
05-04-03-02-01
10-09-08-07-06
01:
02:
03: ground (black)
04: reverse signal (blue)
05:
06: 12v (orange)
07: unknown (brown)
08:
09:
10: 12v (black w/ Red stripe)
If you have a missing set screw, find a 10-24 X 1/2 black phillips head screw at your favorite hardware/big box store.
switched 12V: tap the 3rd from the top (15w fuse) in the cabin fuse box bank with a fuse tap (size ATP/mini)
reverse light: Red with yellow stripe in the wiring loom that runs along the door sill.
ground: tap one of the wires in the map light area
I have both 12v wires attached to the switched power from the tapped fuse so that someone can't open my garage door without the engine running.
The dimming gradually darkens over a few seconds and when I go into reverse, the mirror gradually undims to allow a full and clear view of the rear. The saved garage door programming is not lost even after powering everything down so the installation is a success even though the mirror has a slight overlap with the driver side visor. With the mirror adjusted, the visor does not touch the mirror when moving it into the down position.
After doing a little research, it appeared that there are basically 2 popular models, the GNTX 313 and 453. Depending on what car you search for, you might find it cheaper. The 313 is the older model so my advice is to avoid the 313 if you can and look for 453 (also known as OBIHL3).
The wiring colors are all dependent on the car the mirror is pulled from. I found my mirror on ebay for $38 with free shipping and it came from an 08 Nissan Maxima.
When shopping, you should look for unworn buttons and the plug with wire harness attached. No matter what color wires you get, the pins are the same between the 313 and 453.
from the back of the plug with the wires facing you and the push lock at the top:
05-04-03-02-01
10-09-08-07-06
01:
02:
03: ground (black)
04: reverse signal (blue)
05:
06: 12v (orange)
07: unknown (brown)
08:
09:
10: 12v (black w/ Red stripe)
If you have a missing set screw, find a 10-24 X 1/2 black phillips head screw at your favorite hardware/big box store.
switched 12V: tap the 3rd from the top (15w fuse) in the cabin fuse box bank with a fuse tap (size ATP/mini)
reverse light: Red with yellow stripe in the wiring loom that runs along the door sill.
ground: tap one of the wires in the map light area
I have both 12v wires attached to the switched power from the tapped fuse so that someone can't open my garage door without the engine running.
The dimming gradually darkens over a few seconds and when I go into reverse, the mirror gradually undims to allow a full and clear view of the rear. The saved garage door programming is not lost even after powering everything down so the installation is a success even though the mirror has a slight overlap with the driver side visor. With the mirror adjusted, the visor does not touch the mirror when moving it into the down position.
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