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Discussion Starter #1 (Edited)
I've wired up a dashcam to my 2018 Impreza without Eyesight or a powered mirror, by tapping the powered mirror plug that's in all Impreza's (rather than going down all the way to the fuse box). It's only powered when the vehicle is in ACC or ON. Hope this information helps someone.

1. Remove the ceiling console as per the PDF for the H501SSG200/H501SSG300 kit (steps 5-9 for vehicles with eyesight, steps 5 and 10-11 for vehicles without). Note: for vehicle without eyesight, after removing the screws on step 11, you pull down on the back edge (towards the rear of the vehicle), which is held on by two clips. I've attached screenshots of these steps.

2. Locate the unconnected wire connector (see pic). It's 5 pins. From the orientation shown, going from left to right, the 2nd pin is ground, 3rd pin is 12V. This is what I tap for 12V power. Depending on your application, you could use the 12V power directly, or if your device is USB powered, you'd have to attach to a power converter. I tapped it using a molex female terminal and wrapping it in electrical tape to keep it isolated from the other pins.

3. Route the tapped power through the front headliner down to the mirror if that's where you want to install the dashcam/radar detector. That's where I did.

Reinstall.
 

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I just added a new Uniden R1 radar detector (figured a new car should have a new modern radar detector). I tried to find switched power in the headliner console, but didn't have any luck. There's a real easy "always on" source, but I knew it would only be a matter of time until I'd return to my car to find a dead battery.

So I ran one wire down to the fusebox and it was easy and is completely hidden. The wire stays above the headliner then is hidden by a rubber seal on the A-pillar. I added a fuse tap (with a 2 amp fuse) to power my detector and to trigger the relay for my new PIAA fog lights. A small length of RJ11 power cable sticks out enough from the headliner console to power the detector. I placed the detector under the console (with a "custom made" bracket) but it's partially obscured by the mirror. I wanted it to be hidden from passers-by and protected from the sun. It still seems to work pretty well.
 

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I have had an R3 for about a year and it's the BEST radar detector on the market. You'll love your R1.
 

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Discussion Starter #5
I was originally going to run a wire down to the fuse box, but tapping the switched power via the plug intended for the auto-dimming and homelink mirror seemed to be easier.
 

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I'm thinking of installing both a dash cam and radar detector soon. I have the HomeLink mirror though so I guess the power wiring is already in use. I wonder if it's safe to somehow tap that wire anyways or if it will mess up the mirror electronics. I guess I'll probably just run a new wire down to the fusebox and use a fuse tap like already mentioned.
 

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I have been wondering if there was power in there that I can use! Thanks for doing the work for me :) Do you have pictures of the dashcam btw?
 

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Is the 12v power in the plug (pin 3)constant or switched? I only want switched as I only want driving mode with the cam, not parking.
 

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Is the 12v power in the plug (pin 3)constant or switched? I only want switched as I only want driving mode with the cam, not parking.
It’s switched with the ignition.

I just installed a viofo dash cam yesterday. Hardwired with the mirror plug, but I also grabbed constant power from the overhead lights (for parking mode).
 

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Does anyone have the wiring information for that 5 pin connector? There is a small 6" 5 pin harness that connects that connector to the autodimming mirror. I am trying to find the mirror pin outs. But it may be helpful if I can get the connector information. The connector should have a wire for reverse, ground, ACC switched +12v and 2 more leads to go to the outside autodimming mirrors.

I have gotten the online WRX manuals but it seems the WRX has a only 3 pin connector on the car so the WRX harness converts the mirror 5 pins to only 3 so that information is inconclusive to map out the mirror side colors which are brown, yellow, white, black and gray.

The 5 pin harness has black/red, black, black/white, black and black wires if you look at the 3rd connector picture above.
 

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2019 Subaru Impreza Sport 5 Dr. Manual Shift
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I have that if it helps, I don't have eyesite so it was easier for me I think, I tapped into the autodim mirror for both my radar detector. For the dash cam, I used the power socket in the console running the wire across the headliner and down the A pillar. My dash cam has a GPS module on the power wire had to stick to the window by the a pillar.

VAVA Front / Rear Dash Cam - 2019 Subaru Impreza Sport (No Eye-site - due to being a manual shift)

They make taps you can use to just plug into the back of your autodim mirror harness and not disturb the headliner, this is for the V1 but I know they have various ends like mini USB etc
https://www.amazon.com/gp/product/B00L2SVXQO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I just used a meter to probe the wires.
 

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View attachment 24136

I have that if it helps, I don't have eyesite so it was easier for me I think, I tapped into the autodim mirror for both my radar detector. For the dash cam, I used the power socket in the console running the wire across the headliner and down the A pillar. My dash cam has a GPS module on the power wire had to stick to the window by the a pillar.

VAVA Front / Rear Dash Cam - 2019 Subaru Impreza Sport (No Eye-site - due to being a manual shift)

They make taps you can use to just plug into the back of your autodim mirror harness and not disturb the headliner, this is for the V1 but I know they have various ends like mini USB etc
https://www.amazon.com/gp/product/B00L2SVXQO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I just used a meter to probe the wires.
Thank you peaty. I was able to get that diagram. But unfortunately, it keeps showing the 3 pin plug for the rear view. I want to wire the reverse too since I am doing it for a non Subaru so I needed the pin outs of the 5 wire harness. I do have the harness that plugs back into the mirror harness.
 

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Okay. Found the diagram. The 5 pin connector is displayed in the Legacy manuals. I know people have used Legacy outside autodimming mirrors to upgrade their Imprezas. Had found that write up a while ago.

So, the Impreza manuals show a 3 pin connector but there indeed is a 5 pin connector in the overhead console. If someone can grab a pic of the wires in the connector, I would appreciate it.

Uploading the diagram for others who may find it beneficial. My issue is I only have the black wires harness and the mirror side colors. I need the car side colors to ensure correct wiring. Thank you for the help so far. If someone grabbed pictures of the connector with the car wires, it would help me immensely.
 

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I solved my issue. Found another diagram for the 12366 connector and everything check out. Here is an image from the Crosstrek forum. I had gone over that thread more than once but only looked at the real wire pictures not the attached one. I am only looking at the 5 pin 12366 connector. :)

Thanks go to JBartus at the subaruxvforum.
 

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Just to add a clarification. The diagram above is from a Forester. The pins of the 12366 connector are different between the two. Which is why the mirrors are not a direct swap even though the Gentext models are virtually same and look identical. In the Impreza, the wiring is reverse. So the red/black wire is at pin 1 and so on. So, white/black the +ve is in the middle of the connector at pin 3, the pin 4 black is -ve and the pin 5 black is the reverse signal. I have not wired the mirror yet and will post an update but the connector and the wires on it are different than on the other thread at the other forum I liked above.
 
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