Done. New Sony unit installed and everything is working as it should. AND sounds amazing! Local stereo shop that I got the unit from had time that day to install and sort out some new components and crossovers etc. Work a couple bucks in my mind.
I took apart the A/C controls and replaced the fan selector, pretty easy, just take your time undoing the cable from the circuit board.
Sorry I was confused by some missing wires on the pinout, They all work and are controlled by the A/C amplifier shielded wires on Plug A. So if you have rear A/C and heat, just trust the process. If it doesn't work, likely the buttons on the "new" unit are lousy.
Thanks again to those that blazed the trail. I'm so happy to be in the Analog dial world again.
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Boom, welcome to the club. "Trust the process" is right, the Pin out guide we used and worked on should work for almost everyone. Congrats bringing your LC/LX into the 2020s. Even 2021 200 series don't have carplay/android auto. It's a game changer, and one of the main reasons I'm able to keep driving a 23 year old vehicle.