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I and my father, who is an electronics engeneer, did some investigating on the diagraqms and it looks like ECU needs +12v from both A/C panel and the trinary switch to apply ground to pin 85 of Q22 ralay. In that case grounding the grey/black wire won't work. I start to suspect that everything could be ok and the only reason of innoperative A/C is that I am low on pressure in the system. The problem is that when I was checking the circuits the engine was off ( only the key turned) Now when I know it goes through ECU, I suspect that it doesn't aply ground to relay because it "knows" the engine is not running.
I plan to try jumping wires at the red connector by trinary switch but on running engine, hope it works, will post an update.
BTW,does anyone know where to look for G337 if I need to check if wires ok?
Thank you Steve for your help
E.T.
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