Wiring

Before you begin, to make things easier, don't cut your old connector right off before you start. Cut the wires one-by-one, as you need to cut them to connect another wire to it, that'll save you some trouble as some wires are the same colors.

Now some wiring, let's start by turning this thing on. First let's assume that the USDM connector is the one with 16 pins not the one with the 5 big wires. First connect the No. 8 (BLK/YEL) wire from the UDSM connector to the No. 13 (BLK/YEL) wire on the 20-pin JDM connector. Next connect the ground. There are 2 grounds on the JDM unit, there's the No. 10 (BLK) wire on the 16-pin JDM connector and the No. 16 (BLK) wire on the 20-pin JDM connector. Connect those 2 wires to the No. 13 (BLK) wire on the USDM connector. At this point the unit should turn on. You'll have to press some buttons on it to actually see something on the display. When we'll connect the memory you won't have to do that every time you start the car.

Hook up the wire No. 11 (WHT/YEL) on the JDM 20-pin connector to any wire that always have power to it, even when the car is stop, just like the memory wire on your stereo.

Now some basic functions, connect the No. 6 (RED/BLK) wire from the USDM connector to the No. 2 (RED/BLK) wire on the 16-pin JDM connector. This is what dims your Climate Control when you turn on the headlight.

For the rear window defroster you connect the No. 10 (YEL/WHT) wire from the USDM connector to the No. 14 (YEL/GRN) wire on the JDM 16-pin connector.

For now the unit doesn't do much yet, other than looking cool and turning on the rear window defroster. So let's make it more functional. We'll connect the Mode Control Motor to control in which vent the air goes to. There are 6 wires to connect for this and it's pretty much just cut wire and splice it to the new connector.

• The No. 3 (BRN/WHT) wire from the USDM connector goes to the No. 6 (BRN/WHT) wire on the 16 pin JDM connector
• The No. 7 (LT GRN/WHT) wire on the USDM connector goes to the No. 15 (LT GRN/WHT) wire on the JDM 16 pin connector
• The No. 9 (LT GRN/RED) wire on the USDM connector goes to the No. 15 (LT GRN/RED) wire on the JDM 20 pin connector
• The No. 14 (BLU) wire on the USDM connector goes to the No. 7 (BLU) wire on the JDM 16 pin connector
• The No. 15 (BLU/RED) wire on the USDM connector goes to the No. 8 (BLU/RED) wire on the JDM 16 pin connector
• The No. 16 (YEL/GRN) wire on the USDM connector goes to the No. 16 (YEL/GRN) wire on the JDM 16 pin connector

Now we'll hook up the Recirculation Control Motor, there are 2 wires to connect for this. Just like the mode control motor it's pretty much cut and splice back.

• The No. 4 (GRN/RED) wire from the USDM connector goes to the No. 13 (GRN/RED) wire on the 16 pin JDM connector
• The No. 11 (GRN/WHT) wire from the USDM connector goes to the No. 5 (GRN/WHT) wire on the 16 pin JDM connector

Well now that you can control where to blow the air and choose if you want the air from inside or outside of the car, it might be a good idea to actually blow that air out now. There is a bit of wiring to do in order to control the blower. First take a look at this diagram at the left. The square thing on the left is the power transistor and the other one is the blower motor high relay. All wires on this diagram are wires you will have to add. The dots on the diagram is where the wires are connected together in the diagram and the numbers are where you'll connect the end of those wires to your car's wiring and JDM Climate Control. The power transistor is what replaces the blower resistors on the blower unit.

Here's what you have to do now

• Cut the BLU/RED wire that's connected to the blower motor, you'll have to connect it to the #1 wire on the diagram.
• You will have to splice a wire that comes from the No. 9 fuse in the Under Dash fuse box and connect it to the #2 wire on the diagram. There are plenty of places to splice that wire. You may use the BLK/YEL wire that connects to the recirculation control motor and attach your relay near the blower unit (that's where the relay is in the JDM).
• Now connect a wire to the #3 wire on the diagram and to the No. 1 (BLU/RED) wire on the JDM 16 pin connector.
• Connect the #4 wire on the diagram to the No. 3 (BLU/ORN) wire on the JDM 20 pin connector.
• Connect the #5 wire on the diagram to the No. 9 (WHT/BLU) wire on the JDM 16 pin connector.
• And the last but not least #6 wire is connected to a ground anywhere you want.

The transistor can be a little tricky, you have 3 pins on it, look at it this way, the pin that's alone is the top pin, that's the pin you'll have to hook the #1 wire on. The pin on the right is the ground. The left one is the wire that goes to the No. 9 (WHT/BLU) wire on the JDM 16 pin connector. Since the BLU/RED wire is quite big compared to the other wires, you should probably use a wire that's about the same size from the BLU/RED wire to the power transistor. Also you should probably use a wire that size for the ground wire from the power transistor. You should also use big wire for the BLU/RED wire from the splice between the blower motor and power transistor to the blower motor high relay and from the blower motor high relay to ground. For the other wires, use the same size used almost everywhere.

You should make sure all those wires are connected properly before turning the unit back on. Also make sure you put the power transistor where the blower resistor is in the blower unit because some people blew up their power transistor because it overheated.

The air mix motor's wiring is pretty easy.

• The RED/YEL wire goes to the pin No. 4 on the JDM 16 pin connector.
• The RED/WHT wire goes to the pin No. 12 on the JDM 16 pin connector.
• The GRY wire goes to the pin No. 7 on the JDM 20 pin connector.
• The PNK/BLK wire goes to the pin No. 8 on the JDM 20 pin connector.
• The LT GRN/RED goes to a common ground point with the sensors to pin No. 17 on the JDM 20 pin connector.

Now it's time to attach sensors to our system.

• The BRN/RED wire on the In-car temperature sensor goes to pin No. 18 on the JDM 20 pin connector.
• The BRN wire on the Evaporator temperature sensor goes to pin No. 9 on the JDM 20 pin connector.
• The BRN/WHT wire on the Outside Air temperature sensor goes to pin No. 19 on the JDM 20 pin connector.
• The WHT/RED wire on the Sunlight sensor goes to pin No. 10 on the JDM 20 pin connector.
• The PNK wire on the Heater core temperature sensor goes to pin No. 20 on the JDM 20 pin connector.
• All LT GRN/RED wires goes to a common ground point shared with the air mix motor on pin No. 17 on the JDM 20 pin connector.

The No. 5 (ORN) wire from the JDM 20 pin connector should be connected to the Vehicle Speed Sensor (VSS) wire (ORN) in the car. You can connect it to the ORN wire for the VSS at the ECU.

The No. 1 (BLU/RED) wire from the USDM connector goes to the No. 1 (BLU/YEL) wire on the 20 pin JDM connector