This may have been done before so I apologize if I’m being redundant but I didn’t find a great guide for installing aftermarket head unit in a GR WRX so I figured I would write one.
Here’s my write up for install and wiring of an aftermarket stereo unit in my13 WRX Impreza. I would like to start out saying that I detest wiring, it’s a pain in the butt and gives me a headache. Buuut it’s a good skill to have and I have done a bit of it on a few things (cars and otherwise). It took longer than I expected but was actually easier, had less problems and was worth the effort. I’m very happy with the result.
I opted for the Kenwood DNX692 head unit with HD radio, Bluetooth, apps, SiriusXM, and Garmin GPS navigation. Any unit should follow a similar process. I purchased a Metra wiring harness, a dash kit faceplate adapter, a PAC-audio SWI-RC steering wheel control adapter, and the Kenwood KCA-IP103 iphone6 USB cable. Other tools and items you will need
• Philips head screw driver
• Flat head screw driver
• Wire stripper
• Wire cutter
• Wire crimper
• Your choice of connectors, (I choose jacketed flat plugs)
• 10mm socket
And I also recommend you have a flash light, patience, electrical tape, a drill, and a few beers won’t hurt.
Before you even touch the car, start by prepping the wiring harness connectors. You’re going to need to use an adapter such as the metra harness and wire it to the main plug for your aftermarket stereo. Colors should match but check and read the wires to be sure. I like to use removable connectors instead of soldering so if something is out of place or you want to change systems later it’s much easier. Here’s a picture of me doing the harness, my connectors, wire tool, and the metra harness. It’s best to put all the female connectors on one side and male on the other. Take your time, enjoy a beer.
Once this is done and you can go ahead plug the connectors together. Now you’re going to either want to use the brackets that come with your dash kit, or you can take them off the stock stereo later. But either way these are needed to mount your unit in the dash. I recommend the aftermarket dash kit because there is a faceplate adapter to make the edges clean.