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Discussion Starter #1 (Edited)
I have a digital multimeter and I have checked that the AC Relay is not getting ground from the ECU when the AC is set to on (65 degrees set) and it has a very high resistance of 242.6 k ohms on the Blue/White wire. I also checked continuity from ecu and it is getting continuity on the Blue/White wire. Would like to know what is causing the AC Relay not to get ground from the ECU.

I was not able to find a full ECU diagram for Infiniti G20 2002, but I was able to find these articles:



I at least came to a conclusion that the Blue/White wire is supposed to be the ground from the ecu. And that this car has a Thermo Amp Control. I also read an article of another car and said that either a thermister or a pressure switch can cause there to be no ground. I am not sure if this could be the problem in my case, but I will update to see if it works or not. I have not changed the pressure switch just yet, but would like to know if there is some feedback to this.
 

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Discussion Starter #2 (Edited)
I talked to technician and he says it is the ECU because the climate control has code 20 meaning that sensors are ok. At first I had ambient sensor issue but that got fixed already, its just my ecu is not grounding AC Relay. Also I put my scanner in and checked for live data and I noticed that I turned on the AC and the ECU did not detect the AC turned on and it said relay is OFF. I am not sure which cable tells the ecu to turn on relay. My guess it would be a yellow wire from the climate control since that is the only thing that gets 12v when turned on. Can someone tell me which cable tells the ECU that AC is ON?
 

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Discussion Starter #3 (Edited)
The fault was a faulty transistor, the common cause for P0505. I change the transistor and is now working. I posted a video about this issue:
 
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