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How to: Use JDM Fogs with USDM Switch
A disadvantage of installing the JDM fog light kit is that you sacrifice one of the switches in the three switch cluster. Most common is eliminating the dimmer control.
With this "How To" you'll replace the factory switch holder with the switch holder that is provided in the USDM fog light kit. The JDM fog switch will also be replaced by the USDM switch. You do not need to purchase the USDM fog light kit for this modification, only certain components.
JDM fog light switch to USDM switch conversion:
This conversion is for the fifth generation Honda Prelude. It facilitates the use of a USDM fog light switch and bezel with the ever popular JDM fog lights and wiring harnesses; which allows one to not lose the use of a switch as using a JDM switch requires. This modification assumes that you have already installed your JDM fog lights, JDM exterior and interior harnesses. This method is by far the simplest method to modifying your JDM interior harness. This method will also allow one to easily revert back to using the JDM switch. It took longer to create these instructions than performing the modification. Should take about 10 to 15 minutes.
One drawback is that the green fog lamp indicator on the USDM switch will be on when the switch has power going to it. In other words the indicator lamp will show when the fog lights have the power capability to turn on rather than showing that the fog lights are actually on. So if you selected your fog lights to have the ability to turn on when you turn the ignition to the on position (accessory connection #1), the indicator will come on at that time. It is better to have your fog lights and indicator light come on when the parking and dash lights are on (accessory connection #2).
Parts and Materials Required:
Here are two photos that compare the USDM (left) and JDM (right) switches. No modifications to the switches are required. These photos are for your reference only. This main difference with the two switches is the orientation. The JDM switch resides vertically, while the USDM switch resides horizontally. The fog light icon on the JDM switch lights up with your dash lights while the USDM one does not. The rear of the switches also have different shaped Molex plugs. They are almost the same which makes the modification simple.
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