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On my Subaru WRX the plug for the Homelink mirror was already there behind the interior light. It was an option and the wiring harness had the unused plug.

You might look there on the Honda to see if they did the same thing.
 

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I’m hooking up auto dimming mirror from a 2017 accord this weekend into my 2019 sport 2.0. Without homelink. Was $35. For homelink power you can use the red wire from the dome light. For auto dimming I’m looking for a wire that’s only on when car is on. I’m thinking the sunroof power wire. Will let you know after I’m done this weekend. The auto dimming mirror also has a wire that turns it off for reverse which I don’t use mirror for reverse at night so I’m not hooking that wire up. For garage opener I’m going to install a small button on one of the blank switches to left of steering wheel and wire that into the opener and hide that behind the dash.
 

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Wire in photo is only hot with lights on. It connects to the sunroof control unit. I used that for the hot for my auto dimming mirror. I used the black ground wire from the dome light for my ground. And if you need a constant hot for homelink you can use the red wire on the dome light for that. Mine working good happy with it. Let me know if you need help
 

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Was considering adding rear view mirror with homelink to my 2018 LX, but dropped it for now. I have a remote button on my sun visor and recently converted my garage to a smart garage using myIQ (~ $60), so don't feel a compelling need. I can also open it through the app on my phone - its easy but not as convenient as the remote button or a Homelink on a rear view mirror. The custom button option by @Bricem is probably the best.
 

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Was considering adding rear view mirror with homelink to my 2018 LX, but dropped it for now. I have a remote button on my sun visor and recently converted my garage to a smart garage using myIQ (~ $60), so don't feel a compelling need. I can also open it through the app on my phone - its easy but not as convenient as the remote button or a Homelink on a rear view mirror. The custom button option by @Bricem is probably the best.
I have MyQ opener also. Use Siri button on wheel to open garage but when I don’t have my phone hooked up I have to get it out and open app and it’s annoying sometimes. I’ll send pic of custom button when I’m done. Button cost me $6 already have wires soldered to my remote. Just need to drill the hole in the blank switch slot.
 

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I have MyQ opener also. Use Siri button on wheel to open garage but when I don’t have my phone hooked up I have to get it out and open app and it’s annoying sometimes. I’ll send pic of custom button when I’m done. Button cost me $6 already have wires soldered to my remote. Just need to drill the hole in the blank switch slot.
Here is the garage door opener setup I just finished. I’m happy with it.
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I recently purchased a universal mirror with a three button universal remote. Took about five minutes total to install and program. I just unscrewed the old mirror and slid the new one on. The transmitter is also removable. Looks factory and is a nice improvement compared to OEM mirror. No wiring needed and no warranty issues from dealer. The buttons don’t show like the pic below they are tucked under mirror.
4135
 

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I recently purchased a universal mirror with a three button universal remote. Took about five minutes total to install and program. I just unscrewed the old mirror and slid the new one on. The transmitter is also removable. Looks factory and is a nice improvement compared to OEM mirror. No wiring needed and no warranty issues from dealer. The buttons don’t show like the pic below they are tucked under mirror. View attachment 4135
I like this idea! Do you have a pic of it installed?
 

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Based on the information in that link I'd say that Honda didn't leave a connector that you can use up by the mirror. Too bad. The instructions are good, but there are a lot of steps to do it right.
I ended up paying a dealership about $200 to do that for me, used the genuine part from this very website, they installed it nicely and cleanly, love mine!
 

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View attachment 3651 View attachment 3652
Wire in photo is only hot with lights on. It connects to the sunroof control unit. I used that for the hot for my auto dimming mirror. I used the black ground wire from the dome light for my ground. And if you need a constant hot for homelink you can use the red wire on the dome light for that. Mine working good happy with it. Let me know if you need help
“Wire in the photo is only hot with lights on”. Do you mean like an accessory? Or when the actual head lights are on?
 

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I recently purchased a universal mirror with a three button universal remote. Took about five minutes total to install and program. I just unscrewed the old mirror and slid the new one on. The transmitter is also removable. Looks factory and is a nice improvement compared to OEM mirror. No wiring needed and no warranty issues from dealer. The buttons don’t show like the pic below they are tucked under mirror. View attachment 4135
[/QUOTE
I recently purchased a universal mirror with a three button universal remote. Took about five minutes total to install and program. I just unscrewed the old mirror and slid the new one on. The transmitter is also removable. Looks factory and is a nice improvement compared to OEM mirror. No wiring needed and no warranty issues from dealer. The buttons don’t show like the pic below they are tucked under mirror. View attachment 4135
How are you liking this? Is it auto dimming or manual? Mirror size similar to the stock mirror?

Thanks
Valentine
 

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Thanks, Bricem, for helping me get going on this! I happened to pick up a (Kia-sold) Gentex auto-dimming mirror with HomeLink for $21 (thanks, Slickdeals) and wanted to add some install notes:
  • The light gray (not white; confirmed with wiring schematic) wire that Bricem photographed is for the ambient light near the sunroof switch
    • To answer blue_monster's question - the wire's 12v is switched to the headlights, not the ignition
    • I was going to use it for the mirror's auto-dimming function, but the mirror wouldn't operate at 100% of its intended utility (no compass or auto-dimming during the day)
  • From what I could tell from poking around with the multimeter, there are no ignition switched 12v sources going to the overhead center console
  • I didn't check it, but imagine the closest possible source of ignition switched 12v is the camera unit
  • Instead, I elected to run a wire down to the interior fuse block - I was hesitant to do so initially but it was SUPER easy
  • Success!
    • On the mirror you can see the compass heading and green light on during the day (headlights off); this is the advantage of using ignition switched vs. headlight switched 12v
-ace
 

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Thanks, Bricem, for helping me get going on this! I happened to pick up a (Kia-sold) Gentex auto-dimming mirror with HomeLink for $21 (thanks, Slickdeals) and wanted to add some install notes:
  • The light gray (not white; confirmed with wiring schematic) wire that Bricem photographed is for the ambient light near the sunroof switch
    • To answer blue_monster's question - the wire's 12v is switched to the headlights, not the ignition
    • I was going to use it for the mirror's auto-dimming function, but the mirror wouldn't operate at 100% of its intended utility (no compass or auto-dimming during the day)
  • From what I could tell from poking around with the multimeter, there are no ignition switched 12v sources going to the overhead center console
  • I didn't check it, but imagine the closest possible source of ignition switched 12v is the camera unit
  • Instead, I elected to run a wire down to the interior fuse block - I was hesitant to do so initially but it was SUPER easy
  • Success!
    • On the mirror you can see the compass heading and green light on during the day (headlights off); this is the advantage of using ignition switched vs. headlight switched 12v
-ace
Do you have a part number for that mirror, this may be cheaper than using a used Honda mirror with the wiring adapter. A google search show me two from Kia parts, just curious as to the exact one you used and did it mount into the stock mirror location. Thanks
 
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