Just wanted to give a little progress update. I've been building a harness the past couple nights. My plan is to put it in my Crosstrek but the problem was the 13-17 XV's never came with Harman Kardon audio as an option. To solve this I'll be building an adapter harness to re-map the wires. Everything will be soldered and heat shrink wrapped. This harness will require ZERO cutting or splicing of my Crosstrek's harness so at any point the factory radio could be put back in.
This also isn't my first rodeo. Two years ago I built a similar harness for my father-in-law's Tacoma adding JBL Audio & Amp to a truck that did not have it from the factory. I documented that
here if anyone wants to read. I'm following the same process and logic to build this harness.
Night 1
Night 2