So I've an r33 sedan 1997, years ago I did an engine swap and the electrician cut one too many wires. I fixed most issues over the years like abs and other running issues that were related to wiring. R33 now runs perfect. I have one problem left and that is the AC, I searched and searched and cannot find an ac button signal from any wire that comes from the ac control unit, neither I see any change to the thermo amp wires when ac button is pressed on and off. I checked the wiring diagram and it shows a pin 27 (grey) from the ac control unit goes to a pin 36 on the ecu, I don't understand this as the only ecu that utilizes pin 36 is the rb26 ecu and that is engine air temp sensor. My engine harness has no wire going to pin 36, and I've checked other engine harnesses for different rbs and none carry the wire for pin 36.
can someone point me in the right direction for getting the compressor to turn on using the ac button? I've tried hooking up the pink wire from thermo amp to pin 46 on ecu and compressor relay wire (green with red stripe) to the pin 9 on ecu but no response, no changes and no switching signals that corresponds with the ac button. Thanks for taking the time to read, any help will be appreciated.