Honda Civic Si / SiR 3-Pin 2.0mm Stop Light / Turn Signal Waterproof Connector – OEM 6187-3281 / 6180-3261
Direct OEM-specification replacement for the Sumitomo 3-pin waterproof wire harness connector used on stop light (brake light) and turn signal circuits on Honda Civic Si and SiR platforms. Cross-references Sumitomo / Honda OEM part numbers 6187-3281 and 6180-3261. Uses the 2.0mm contact series in white nylon housing with waterproof sealing — designed for rear lighting harness applications where moisture resistance is required.
The 3-pin stop light and turn signal connector on Honda Civic Si and SiR is located in the boot (trunk) area or rear bumper harness, exposed to moisture ingress from the boot seal and road spray. A failed connector causes a non-functioning brake light or turn signal — both roadworthiness violations. On the Civic Si and SiR, the rear lighting harness connector is also frequently damaged during rear bumper removal for bodywork or aftermarket spoiler installation.
| OEM Number | Application |
|---|---|
| 6187-3281 | Honda 3-pin 2.0mm waterproof connector (female housing) |
| 6180-3261 | Honda 3-pin 2.0mm waterproof connector (male housing) |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | Stop light signal (brake switch) | Brake light not illuminating — roadworthiness violation |
| 2 | Turn signal / indicator signal | Indicator not flashing |
| 3 | Ground / earth | Both circuits inoperative |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Contact Series | 2.0mm pitch (Sumitomo series) |
| Housing Material | Nylon, white |
| Sealing | Waterproof |
| OEM Part Numbers | 6187-3281 / 6180-3261 |
| Applications | Stop light (brake light), turn signal / indicator |
| Compatible Models | Honda Civic Si, Civic SiR |
| Terminal Included | Yes |
Q: My Honda Civic Si brake light is not working after a rear bumper removal — could it be the connector?
A: Yes. The 3-pin rear lighting connector is the most common failure point during rear bumper removal on Honda Civic Si and SiR. The 2.0mm terminal is easily bent when the connector is pulled without pressing the release tab. Inspect the connector before replacing the brake light bulb or switch.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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