Hi there,
I'm sure controls are not coded, as I tried different modules in my car and it worked perfectly each time.
Secondly - aircon will work when turned on by diagnostic computer, always. That's the nature of diagnostic. However, it should only be used for a really short time, to avoid compressor damage. It is used mostly to check if compressor clutch engages properly, in essence electrical bits.
When I had problem with my aircon, it turned out that I had no coolant in the system. It just escaped over the years, so pressure switch was not engaging. Once vacuumed and refilled, it started working. Compressor is a bit noisy, but that's the whole different story...
I hope it helps a bit. Cheers.
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