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Resurrecting this thread now that summer is in full swing. It seems the signal the 240sx sends to the ECU to turn the A/C on is on the F1 plug (blue/green wire). The weird thing I noticed is when you turn the A/C off, this wire has 6 volts...when I turned A/C on, it drops to 0. I wish I could check another 240sx to verify this. The problem is the 2jz ECU wants a +12v positive signal on pin 34 of the 40 pin connector in order to turn on the A/C by triggering a negative signal on pin 23 of the 40 pin connector which should be wired to pin 1 of the A/C relay in the engine compartment, which turns the relay on to put +12v to the compressor. This is how my harness is wired from Dr. Tweak, which I do not recommend. Anyways, it doesn't work as is from these amatuer wiring business, so I am going to wire a small switch wired to a ground on one side and to the A/C relay ground wire on the other to manually turn on the A/C, then I will split the +12v signal going to the compressor and send one wire to the compressor and one back to pin 34 so the ECU will know to idle up. I used a mx83 Cressida top hat and suction hose on the compressor, and the 240sx high pressure hose, then had to get about a 1 ft section of custom hose with the firewall fitting on one end, and the Cressida fitting on the other. It's all charged, now just needs the switching to work right.
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