So I made some progress tonight. I had one female harness plug that didn't seem to match anything on the radio or AC. There is a "network gateway computer" module mounted behind the radio on the firewall. The female harness matches the single plug going into that module. When I in plug the harness going into the middle and connect it to the remaining female connector, the hissing goes away and the antenna begins to work as it should with the Teyes radio app. Volume knob and tuning knob still don't work.
Unfortunately, the AC becomes unresponsive at that point. When I reconnect the computer module plug back into the module, the hiss returns and the AC starts working.
I tried factory resetting again and adjusting canbus settings as well. Even did the canbus updates, still wouldn't work with those plugs connected.
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