AC wiring help (89 7mgte)

89 Toyota Supra 7mGTE

Okay so I've tried to do my homework before asking, I have 2 different mk3 manuals, and unfortunately I can't find the answer.

I've gone through the whole wiring of this car when it comes to the AC. We've checked every relay that's noted on the books, and tested for power and ground. Now, there's this one wire, which is blue that comes from the AC relay (sold blue, on the driver side) and it has no power, when it connects to the harness, it goes to the compressor.

When we connect the harness and the relay together, 1 and 2 connector have flowing power but 3 and 4 connector have nothing. So when we by pass power with our power pro the compressor kicks on, we've been killing our self for about a few days to find out what's wrong but can come up with an answer.

Can you guys please help.:nono: