I think it would be reasonably easy to suss out the other pins once you found the correct pin for power in, just by seeing which pin went hot when you pressed a given button. But I'm worried about trying to find that power pin, that if I start indiscriminately putting 12V on the wrong pin, I might burn out something and ruin the whole part. I found wiring diagrams for the AC on a Rover 45, but for an older model, where the switches were configured differently, so it doesn't really reveal anything. Still searching, but haven't found the right diagram yet.