Hi. I recently added A/C on my car which has gone through a D15B non VTEC swap from a carburated engine. The A/C installed works fine but however the person who installed it didn't have ECU pinout diagram with him so he by passed the ECU and installed the A/C directly connected with the battery and alternator. I do know that he installed a relay that is also linked with the thermostat near the cooling coil. The problem that I am facing now is that when ever I turn the AC on, the RPM goes down. I know the reason that since the ECU has been bypassed so the IACV cannot control the engine idle properly as it never knows that A/C load has been applied to the engine. Now... can any one tell me how to link the ECU with AC switch... I know that pin23 (blue/red) is the input signal for ACS (A/C Switch Signal)to ECU from dashboard switch but is that the ground wire that I should feed for the signal or is it the live wire which could be +12v??? or is this signal fed to ECU from the thermostat?? Once this is resolved then the output comes from PIN20 (Black/red) for ACC (A/C Clutch relay) but again... is this a ground signal fed to relay or what?? Please let me know thanks.