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Since the 12” screen isn’t capable of single zone manual temperature control, which your BCM is programmed for, you’re gonna have to use AlfaOBD to change it to dual zone ATC and try to run the screen controls in manual mode synced up. It’ll never truly run right unless you add the in car temperature sensor and the four in-duct temperature sensors. I made a Y cable for a member on another forum so he could run the HVAC off of the old manual controls until he gets the temp sensors, I’m working on a harness to add them.
I know of a few who have. Is that where you got yours? If so, that’s why your controls don’t work at all. Their genie sets the wrong setting in the BCM, and they don’t know how to get them to work when going from a 5” to a 12”.
The genies from infotainment are VIN locked. The dealer will be a crap shoot if that sales code populates to enable for your VIN. It *might* populate if your trim level truck was offered with auto temp control as an option.
