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Thread: How to: Auto dimming compass mirror with Homelink

  1. #1
    Registered Member

    2007 Mazdaspeed 6 GT

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    Nov 2009
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    Pasadena, CA
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    How to: Auto dimming compass mirror with Homelink

    Howdy folks,

    This is the installation how to for the Gentek GenK45A mirror; similar models will probably work the same way. I got mine from eBay through XXXXX; you can probably ask him for the Mazdaspeed setup like he did for the guy in Pasadena (me), and he should be able to set you up.

    Tools: a small torx wrench (for the mirror screw), wire cutters, zip ties, pliers to crimp the wire taps, small thin screwdriver, possibly something to pry trim off (though I got it all off by hand).

    You will need the wire harness, some wire taps, and a mirror cable cover. I got my mirror online at eBay from this vendor; he included everything I needed for the installation, and was a good dealer. You should be able to tell him that you want the same setup for a Mazdaspeed 6 that the guy in Pasadena ordered and get what I have, or something similar.

    So, here we go!

    1) Remove the old mirror. Take a long, thin screwdriver (like a jeweler's screwdriver) and push it into the small notch in the bottom of the rear view mirror. As you push, the spring clip will be released; pull the mirror carefully toward the headliner and it will slide off. The picture shows the inside of the mirror when you do this.


    2) Remove the left A pillar plastic cover. There are two tabs in the middle of the cover; pull it outwards to release them. Then, slide the cover up towards the headliner, off of the square button; eventually it will slide up and away. Step 7 has a picture of the inside of the A pillar, refer to it for this step. Pull the cover out and set it aside.


    3) Remove the driver door kick plate. Release the clips on each end by pulling up towards the interior, then pull the entire kick plate up (under the metal works best) to release the three clips.


    4) Remove the fuse box cover by opening the fuse box and pulling towards the center of the car. The front pin will release; a threaded bolt at the back corner takes some effort the first time to pull out but eventually it will come loose as well. Use a flashlight to see it and figure the best way to pull it off.




    5) Install the new mirror by sliding it onto the button the old mirror was mounted on; if it doesn't go on then you need to replace the button. The mirror has a screw, tighten that down until the mirror is fixed solidly (try not to over tighten).

    6) Plug the wire harness included with the mirror into the back of the mirror. Run it straight up to the headliner, and tuck it along the inside of the headliner to the driver's side A pillar.


    Install the plastic wire cover if included; this snaps into the mirror on one side, the other slides under the headliner.

    It may help to put a couple of small zip ties around the wires, clip the extra, and then use them to help wedge the wires under the head liner (they like to roam free otherwise).

    7) Run the wires along the A pillar as shown (the wires zip tied are for the mirror, my Bluetooth mic is the thing at the top left). Zip tie them in place, but be careful not to tie around the rubber hose.

    Thread the wires down into the hole at the base of the A pillar; this leads behind the dash, so look up from below and pull the wires all the way down.


    8) Once the wires are zip tied in place, you can reinstall the A pillar cover by first sliding it onto the top square hook and then snap it into place (it won't feel that solid, compare it to the passenger's side cover to be sure you have it down). Unplug the mirror at this point, so you don't cause any problems while you are wiring it up.

    9) The Homelink mirror comes with three wires, one for accessory power, one for ignition power and one for ground. The red wire goes to accessory; connect this to the orange wire in the wire bundle at the top of the fuse box.

    You may have to dig to find the orange wire, it is hidden within all the otter wires. Carefully pull it out, and use a wire tap to connect the red mirror wire to the orange wire.


    10) The yellow wire goes to power when the ignition is on; if this wire is powered all the time it will drain your battery. There are several wires you can tap into, I used one I already tapped for the shock sensor. This is the blue/red wire in the middle left plug, right to the left of the fuses.


    11) The black wire goes to ground; this is apparently a standard green/black wire seen in many spots. There is a green/black wire next to the wire tapped in step 10, you can try it, but I used the wire in the pictures since I had already tapped it before. That wire is in the top plug at the back of the fuse box.


    12) Once the wires are all tapped, plug the mirror back in, turn the ignition to the ON position, and look at the mirror. The LCD display for the compass should turn on when the ignition comes on, with all pixels lit; it will then change to a C (for calibration) or a direction (which may or may not be accurate). If this happens, you're done. If not, double check your wiring and connections.

    13) Once the mirror is working, zip tie all the cables into neat bundles, making sure not to pull any wires too tight (you can also trim the mirror wires to length before you tap into the car wiring to make this neater). Reinstall the covers for the fuse kick panel and door kick plate.

    14) Take the car to an empty parking lot. Hold the mirror compass button (far right) until the C appears in the display. Drive around in a circle until the mirror calibrates the compass. If the mirror ships in calibration mode, then you can just drive around and it will calibrate itself after a while.


    In the pictures, you can see that the mirror glass in my mirror doesn't have a box around the display. The guy who set this up for me put the glass on that way. The advantage is that you don't have the box cutting out a part of the reflection, which I liked. The drawback is that it's harder to see the display in daylight, and the display is also polarized so if you wear polarized sunglasses it can disappear (tilt your head to make it reappear). If you want to see the direction at all times, get the display with the box.


    The color is an amber color; it's not a perfect match to our lighting, it's a bit too orange. Red is probably a better match if you can get it, but the amber works well I think.


    Hope this helps anyone who wants to do the mod…you get a larger, better, auto dimming mirror out of it, and I'm really happy with the improvement.
    2007 Mazdaspeed 6 GT

  2. #2
    Registered Member


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    I have question could i use any homelink mirror from any car and get it to work with this one? also did it come with just mirror or bracket that you had to attach to window as well

  3. #3
    Registered Member

    2007 Mazdaspeed 6 GT

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    Pasadena, CA
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    I only received the mirror, it fit fine on the MS6 window button so I didn't have to get a button, remove the current one and use that one. In theory, you could probably use any mirror and get the same result, but you would have to wire it up properly, get it to fit on the button, etc. I can't make any guarantees that it would work, of course (just like I'm not responsible if someone screws up their car following these instructions), but if you have a mirror and want to try it can't hurt. I'd wire it up first and see if it responds properly before taking the car apart and trying to mount it.

    Oh, and I haven't tried the Homelink system yet, since I don't have a need for it (but will when I move in a few weeks), but there are instructions on how to set that up if you get the mirror.
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  4. #4
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    Looking forward to getting this done.

  5. #5
    Registered Member OJ Bartley's Avatar


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    Wow, that looks like a lot more work than I thought it would be! Good job though keymaster. I may decide to go ahead with this and the how-to will be very useful. I haven't got the garage door opener fully installed yet, so when I finish it up I'll see how annoying the little keyring transmitter is, and if I'd rather just have the mirror buttons.
    2006 Whitewater Pearl Mica Mazdaspeed6 GT
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  6. #6
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    2007 Mazdaspeed 6 GT

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    It's really not that bad...the trim parts come off just by pulling, and wiring it up will be a snap since you know what wires to tap. I'd figure this is two hours of work if you're taking it easy and have the instructions.
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  7. #7
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    I bought the mazda mirror through ebay, for peanuts. From the same vendor, I also got the dimming side mirrors. On my 2010 touring, it was completely plug and play, the harness was right there to plug into at the base of the a pillar, with the included plug. No hunting/tapping wires needed. Same with the side mirrors, just remove the old ones, and install the new ones, all the wiring is right there.
    Nice writeup, an easy mod that is well worth it! I was able to get all three mirrors for under $200 on ebay, from the dealer they would be MUCH more.
    2010 touring sixspeed

  8. #8
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    Mazda Demio 2010

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    Quote Originally Posted by keymaster View Post
    Howdy folks,

    This is the installation how to for the Gentek GenK45A mirror; similar models will probably work the same way. I got mine from eBay through XXXXX; you can probably ask him for the Mazdaspeed setup like he did for the guy in Pasadena (me), and he should be able to set you up.

    Tools: a small torx wrench (for the mirror screw), wire cutters, zip ties, pliers to crimp the wire taps, small thin screwdriver, possibly something to pry trim off (though I got it all off by hand).

    You will need the wire harness, some wire taps, and a mirror cable cover. I got my mirror online at eBay from this vendor; he included everything I needed for the installation, and was a good dealer. You should be able to tell him that you want the same setup for a Mazdaspeed 6 that the guy in Pasadena ordered and get what I have, or something similar.

    So, here we go!

    1) Remove the old mirror. Take a long, thin screwdriver (like a jeweler's screwdriver) and push it into the small notch in the bottom of the rear view mirror. As you push, the spring clip will be released; pull the mirror carefully toward the headliner and it will slide off. The picture shows the inside of the mirror when you do this.

    A better alternative to the Jeweller's Screwdriver would be to use a small sized allen key and poke the long edge into the hole, that way you don't have to worry about scratching the windows tint. I learnt that the hard way then i used a screw driver. I would also be easier to manuever an allen key due to it's "L" shape than a straight screwdriver at such steep angle.

  9. #9
    Registered Member

    2007 Mazdaspeed 6 GT

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    Nov 2009
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    Quote Originally Posted by docvirus25 View Post
    A better alternative to the Jeweller's Screwdriver would be to use a small sized allen key and poke the long edge into the hole, that way you don't have to worry about scratching the windows tint. I learnt that the hard way then i used a screw driver. I would also be easier to manuever an allen key due to it's "L" shape than a straight screwdriver at such steep angle.
    Yep, that should work as well, as long as your Allen key is small enough to fit int he hole and stiff enough to push the spring without bending. I didn't have a problem getting up there with the screw driver...the biggest problem is that there isn't any feedback when you push on it if it's enough, and in my case the mirror was a bit sticky and wouldn't move until I gave it some real force.
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  10. #10
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    Mazda 6

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    I need a help with rearview mirror

    Hey Folks, I bought a 2009 Mazda 6 GT v6 version just yesterday.The rearview mirror light doesn't come on.It doesn't do any auto dimming. I checked the fuses,But they are good.Need your help guys.Thanks in advance.

  11. #11
    Registered Member ceric's Avatar

    2017 Mazda CX-5 GT, 2016 Mazda6 iGT, 2014 Mazda3 sGT hatchback

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    As the pic shows, pull the left side kick panel and check the connections (power/ground).
    There are two power lines (switched-for auto-dimming, and constant-for garage opener).
    If not, the unit could be broken.
    2016 Mazda6 iGT + Tech Pkg
    ....Sonic Silver Mica / Parchment
    2014 Mazda3 sGT hatchback
    ....Soul Red Metallic / Almond

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