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Hello, Eddie here, I'm showing E10 coming from the MCU to the ECM as being a communication (network) type signal. (Refer to this diagram) So It would NOT be 12 volts if that is the case. It would be a digital square wave signal.If you unplug the A/C pressure switch, and turn on the air and jump it, do you get compressor engagement then? I will include both wiring diagrams. I like to print them out and put them together. Let me know if that sheds any color on it.
It is manual A/C correct? not Automatic climate control?