My A/C specialist had to fix wiring that ran from the compressor to under the battery tray - he ended up jumping the connector near the battery although the only code I was showing was the a pressure code from a leak that cleared when it had been recharged, but it might give you somewhere to start probing with your multimeter. I don't envy you with this one and can understand your frustration! I think I'd end up finding a proper auto A/C specialist and pay them for the diagnosis on this one ( as I did before because I know my DIY limits end at Air Con )
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