This guide is covering the installation process of the JDM Climate Control in a 4th generation USDM Honda Prelude. It also lists parts and tools you need and how to hook them up. It is not explaining how to remove consoles and stuff like that. All information and graphics are provided "as is" without warranty of any kind.

Parts

You will need the following parts to get a fully functional JDM Climate Control:

• Climate control unit with harness. You may try to get used climate control unit at online auction. Lots of people making money by selling used parts from Japanese spares. If you can try to get everything with climate control unit because some parts are hard to find by themselves. The air mix control motor is one of them and it's almost the most important part of the system. You have to buy climate control unit at least with connectors because the original A/C connectors are completely different.
• Air mix control motor. This is under the blower unit. It's pretty much hardest part to get your hands on so if you're buying a complete JDM Climate Control system, make sure that you get this part. Some sellers will send you the blower motor instead but it is completely different.
• In-car temperature sensor. On the right of the Climate Control Unit, it's a little square vent thing. In the JDM cars it's also attached to a hose.
• Outside air temperature sensor. The little sensor that is attached in front of the radiator.
• Sunlight sensor. On top of the dash near the windshield, it's a little square thing with a round in it.
• Evaporator temperature sensor. This on is in the evaporator unit, where our A/C thermostat is.
• Heater Core Temperature Sensor. It is at the bottom of the heater unit, right under the heater core.
• Power transistor. This is on the blower unit. It's what replaces the blower resistor on the USDM car.

For the sensors, you can get them from a 1st generation Acura CL. The resistance is the same on the CL sensors and the JDM Prelude sensors. The In-car Temperature Sensor is the No. 5 at the picture on the left, the Outside Air Temperature Sensor is No. 4 and the Sunlight Sensor is No. 2. The Evaporator Sensor is No. 19 at the picture on the left.

For the Power Transistor can be also used from a 1st generation Acura CL. It's part number is 79330-SF1-941. For the Blower Motor High Relay you can use a fog light relay and sub-harness for the Prelude but if you will order it at your local dealer you'll receive it with no sub-harness because it has been discontinued. So you can probably find a relay that'll work at a scrap yard or something so you have a connector with it.

Tools

Well you'll need a few tools to install the Climate Control. You'll probably have most tools you'll need if you've done any work on your car already.

• Screw drivers (Flat and Philips head)
• Pliers (A few different pairs is a good idea)
• Wire cutters
• Soldering iron or wire crimper
• Set of sockets and wrenches (Other than the ordinary socket set you'll need a 12mm deep socket and also different size extensions will help)