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S2000 Wire harness?

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Old Mar 21, 2025 | 05:41 PM
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Default S2000 Wire harness?

Hey everyone,

I'm new to this so I apologize if I'm not doing this correctly. I have a 1999 Honda S2000 that is from Japan. I'm trying to figure out the diagram of this connector. It is labeled "P3". I'm trying to figure out what the wires are for but had no luck. It is under the driver side dash.

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Old Mar 22, 2025 | 05:37 AM
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You mean the red aftermarket splice thingie? Looks like a fuse holder. Car have an aftermarket radio or lights?

-- Chuck
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Old Mar 22, 2025 | 05:48 AM
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So here's some more photos. The previous owner installed this "push on" switch. Two wires total. One black wire hooked up to ground and the red wire hooked up to the light green wire. I pushed that button, but nothing happens. I wanted to see what was the purpose of this before removing and if it added any kind of value for me.








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Old Mar 22, 2025 | 08:07 AM
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looks like a factory relay for something and they are using the button to trigger it. are you pressing the button with the key on or off? listen for it to click. ill skim the ETM again...

EDIT: just searched and i cant find anything lt grn that matches the rest of that relay wiring. looks like high current in and out with some control wires. i can't find a japanese ETM to check.

Last edited by spider2k; Mar 22, 2025 at 08:19 AM.
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Old Apr 27, 2025 | 08:29 AM
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Anyone here owns a RHD s2000 that would be able to help me out?
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