Reddit reviews AutoHarnessHouse Aftermarket Headunit Installation Adapter compatible with Subaru 2016-2019

Yes. I have a pioneer w4400nex in my 2018 wrx base model. Great headunit with wireless CarPlay. It’s relatively plug and play with a harness from autoharnesshouse. Here are all the links:

AutoHarnessHouse Aftermarket... https://www.amazon.com/dp/B07GD8627K?ref=ppx_pop_mob_ap_share

Direct wire harness for Pioneer... https://www.amazon.com/dp/B078GBDRVX?ref=ppx_pop_mob_ap_share

Maestro ADS-MSW Universal Analog Steering Wheel Interface https://www.amazon.com/dp/B00J4W10XG/ref=cm_sw_r_cp_api_i_Jg22Db6PFF6R1

Need this to connect FM radio to new Headunit:
Aftermarket Radio Antenna Adapter by Vehicle Aerial Stereo Converter Cable, DIN (Motorola Type) to Antenna Terminal https://www.amazon.com/dp/B07QNL9QQ8/ref=cm_sw_r_cp_api_i_7l22DbVWFF1K2

Need this if you want to retain factory USB port:
Metra Electronics AX-SUBUSB Multicolored Subaru 2011 & Up 4-Pin USB Adapter https://www.amazon.com/dp/B00JYTLW14/ref=cm_sw_r_cp_api_i_do22DbN1SNNSH

This is the dash kit to make the headunit fit properly:
https://www.crutchfield.com/p_142SU2031B/Scosche-SU2031B-Dash-Kit-Gloss-Black.html

Those are all the harnesses/wires you’ll need to make it plug and play. The USB adapter might not work if your car has 2 USB ports in the center console. This shouldn’t be a problem anyways since CarPlay is wireless. The USB ports will still charge your phone regardless. If you have the base wrx, it’ll be fine. On YouTube there are plenty of install vids if you ever feel confused.
Edit: the guy from autoharnesshouse (Brian) is also very friendly if you have any questions about the harness, just email him.

https://www.amazon.com/gp/product/B07GD8627K/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 this is the harness i used, has the reverse 6v signal already to go. all you need us usb retention https://www.amazon.com/gp/product/B01DJ4KVQ6/ref=oh_aui_search_asin_title?ie=UTF8&psc=1

then the speaker harness. https://www.amazon.com/gp/product/B0002BEQJ8/ref=oh_aui_search_asin_title?ie=UTF8&psc=1

and lastly the antenna harness https://www.amazon.com/gp/product/B003VYWSES/ref=oh_aui_search_asin_title?ie=UTF8&psc=1

these were all the things i used to wire in my kenwood. besides the tool to keep steering wheel buttons https://www.amazon.com/gp/product/B00J4W10XG/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

the autoharnesshouse harness makes it easy to use the maestro by the way. hope this helped. i have a 2017 wrx by the way so i dont know if there is a difference with 2015 and the new 2018+s

If you want it to be easy as possible, you can use one of these (and you'll need to pick up a maestro sw or rr):

https://www.amazon.com/AutoHarnessHouse-Aftermarket-Installation-compatible-2016-2019/dp/B07GD8627K/ref=sr_1_1?keywords=autoharnesshouse+brz&qid=1573219865&sr=8-1

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That covers the steering wheel controls and camera, antenna amp, and factory amp. You'll need to add a pin and wire on the harness (it's included) to power up the factory amp and door speakers. Also, ignore the instructions included on the two 5-pin connectors - just connect the two on the harness together if it's not shipped as such. If you want to try to keep costs down and make your own, you'll need to wire in a voltage converter for the camera power feed.

You'll also need the standard Toyota harness for the rest of the speakers. You can use one of AutoHarnessHouse direct connect Pioneer ones, or just make your own a little cheaper. I believe this is the part, but please double check - I don't have the part number handy right now (You can actually get these at Best Buy, it's in their computer system):
https://www.amazon.com/Metra-70-1761-Wiring-Harness-Speaker/dp/B0002BEQJ8/ref=sr_1_1?crid=344R0OVLJ7ACT&keywords=metra+toyota+harness&qid=1573220037&sprefix=metra+toyo%2Caps%2C155&sr=8-1

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For the 4500, I also recommend either wiring up their GPS antenna, or just using an adapter for the OEM one (I went this route just to keep things clean). This pack contains the correct adapter (it's the one with the bright green end, maybe you can find it standalone cheaper):

https://www.amazon.com/gp/product/B01K03PORU/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

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If you don't hook up the GPS antenna, the head unit will throw up an error message every time you start up a navigation app in AndroidAuto (it'll still work, it's just annoying).

Lastly, don't forget an antenna adapter and (optionally the OEM USB port adapter cable). I opted not to use the USB port since I have a high speed charger that uses a 12v socket. Same as above, please double check this to make sure it is the right one, but here's what the antenna adapter looks like:

https://www.amazon.com/Metra-40-LX11-Antenna-Adaptor-Select/dp/B00JYHSDKO/ref=sxbs_sxwds-stvp?keywords=toyota+antenna+adapter&pd_rd_i=B00JYHSDKO&pd_rd_r=aae8b955-0220-497c-bcd6-480183748bd8&pd_rd_w=bmQ4P&pd_rd_wg=7ZU9O&pf_rd_p=a6d018ad-f20b-46c9-8920-433972c7d9b7&pf_rd_r=F20PSH58JCQN60PP1T5G&qid=1573220626

You'll need to wire in the blue wire to power the antenna amp. Don't hook it up to a constant 12v feed (yello), either use a switched feed, or wire it to the matching blue feed on the back of the harness (it's the one that feeds out of the two pins jumped together by a blue wire).

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Sorry I can't be 100% on the last couple of adapters - if you have trouble confirming feel free to DM me and I will be happy to check when I get home from work, I kept the packaging for later reference, and again, Best Buy does have these in their computer, so even if your local one doesn't carry them, they should at least be able to give you the part number.