JDM Automatic A/C Conversion Demonstration

[CTScott]

JDM AC Controls.jpg

I have been fiddling with the JDM Automatic A/C system for quite some time now, with the intention of developing a plug and play harness for Steve (echo_hrs), who imported a couple of sets of the required hardware.

To build the PnP harness, I used the female E8 and E9 connectors from a USDM AC ECU, and a male E11 connector from a JDM wiring harness. I also used an ED1 connector and an E4 connector for the fan wiring from a USDM wiring harness. One piece that I missed, when giving Steve the list of JDM parts needed, was the fan speed control assembly from the JDM Auto AC. The USDM AC uses a blower resistor assembly to adjust the fan speed, whereas the JDM Auto AC uses a solid state speed controller, which responds to a pulsed signal from the AC ECU. Since we didn't import that piece, I had to analyze the signal from the JDM AC ECU and create my own solid state speed control to emulate the JDM one.

Here is a video of it in action:

http://www.youtube.com/watch?v=qbInNKKEwFc


Here is the harness that I created: