I'm in the process of putting together an AP1 s2000 that has an extremely hacked up USDM harness. The engine is a built turbo set-up and will be running the AEM V2 EMS. I have compared the USDM vs JDM Harness and there are only 3 pins that are different. I am not worried about the VTEC or Air Pump wires (located on plug C) as I will be running the AEM EMS. The only different wire that I can see is on the 3rd plug that attaches to under the dashboard (light blue flat plug). The USDM harness uses a WHT/BLK wire in pin location #9 whereas the JDM harness does not have this wire.

Does anyone know what this wire is for? I have gone through the diagrams and it seems to be connector C303 but I cannot find any further information as far as wiring goes in my Helms manual. Has anybody else used a JDM harness on a USDM chassis?

Thanks!



Plug B as shown in the image above.