Framed autodimming rearview mirror to frameless

:
Montreal
:
2022 CX-5 GT
Hi!

I searched for a post like this but had no luck. So I have a 2022 CX-5 GT with the regular autodimming mirror (with Homelink), and I am thinking about installing a frameless mirror instead.
If I'm not mistaken, framed and frameless mirrors have different plugs, although ultimately, all I need is +12V switched (for dimming), +12 constant (for Homelink) and -12V/Ground for obvious reasons. So I don't really understand why the plugs are different.
I checked the installation instructions for the Mazda frameless mirror and it doesn't mention the existing wiring for framed autodimming mirrors.

If I have to splice wires and DIY something, I might just as well get a mirror directly from the manufacturer. So I found a Gentex frameless mirror with autodim and Homelink for around $170 Canadian, and it also takes 3 wires.

What I do not understand though is the fact there are four wires entering the mirror and I can't tell what the fourth one would be for, and if I were to get a Gentex mirror, where that wire would go. Would anyone happen to know what that's for?

Anyone replaced a "regular" autodim mirror with a frameless one?
 
:
2014 & 2019 CX-5 Touring(s)
Not sure this is the answer, but some other autodim mirrors have a 'reverse' signal to UNdim while backing up. YMMV.

UPDATE: OK, so I went and checked schematics. That WAS the correct answer - reverse signal.
 
:
CX5 GT
Correct. And you dont need the 4th wire.
on the framed mirror its supposed to stop the auto dim when you reverse. But to me thats useless and not needed at all.
The framed mirror has female plug inside the mirror and the car wiring ends up with a male.
on the frameless mazda oem the wires are coming form the mirror, no plug on the mirror.
Why mazda did the accessory like this no clue, as it requires splicing of the wires in the A pillar.
You can also connect the 2x 12v+ together if you dont want the homelink to work always even if the car is turned off.
If you find a gentex that has the same female plug that can match the GT default wire male plug that would be perfect. Just make sure the 3 wires march on the plugs.
It also possible to change all plugs to match and then connect but requires finding the right plugs and some work :)
 
Last edited:
:
Montreal
:
2022 CX-5 GT
Correct. And you dont need the 4th wire.
on the framed mirror its supposed to stop the auto dim when you reverse. But to me thats useless and not needed at all.
The framed mirror has female plug inside the mirror and the car wiring ends up with a male.
on the frameless mazda oem the wires are coming form the mirror, no plug on the mirror.
Why mazda did the accessory like this no clue, as it requires splicing of the wires in the A pillar.
You can also connect the 2x 12v+ together if you dont want the homelink to work always even if the car is turned off.
If you find a gentex that has the same female plug that can match the GT default wire male plug that would be perfect. Just make sure the 3 wires march on the plugs.
It also possible to change all plugs to match and then connect but requires finding the right plugs and some work :)
Thanks!
I haven't found a Gentex mirror that has the same plug, but I found a seller on eBay who claims they can custom-make an adapter. They also claimed that there is a short cable that connects the mirror to another connector underneath the plastic cover. I'll need to double-check that, and if it is actually true, to me it's a better option than buying the Mazda frameless mirror and splicing wires in the A pillar.
 
:
CX5 GT
yes. What they do is find the right female connector and plug that to the wires of the mirror.
This female connector plus into your GT male plug directly which gets tucked away in the plastic behind the mirror. The tricky part is finding and sourcing the exact part number of the female connector that plugs to the car male one. I know that few people provide it on the internet but they dont share how they source it.
1$ for connector only vs 10-15$ for the whole thing. Good profit ;)
I had the same idea to change to the frameless mirror but decided to skip for now.
It is also annoying that all the nice to have oem accessories require splicing like the frameless mirror, footwell lights, puddle lights, park sensors, oem remote start, etc but it is what it is.
 
Last edited:
:
Montreal
:
2022 CX-5 GT
I ordered it. Guess we'll see when it arrives!
It's very slightly cheaper than getting a mirror directly from Mazda due to it being shipped from the States, but it will hopefully be plug-and-play and it seems to be an updated version of the frameless mirror.