Well, the saga continues. I was in the car late last night taking things apart (again) and found some important facts. The Up and Down arrows on the wheel gave me "Stalk: in=02 00 ff ff == no button" on the serial port and with my multimeter I found that these are actually shifted buttons (i.e. they show continuity between the middle ring (B) and the ring closest to the plug (A) as well as a resistance value between the tip (C) and A.
The connector has three conductors, which I will call tip, ring, and collar, in order from the pointy end of the plug back towards the plastic housing and wire leads.
The tip is for the buttons, ring is for the "shift" function, and the collar is common to all.
Cheers
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