Honda Accord / Civic / Fit 3-Pin H4 Headlight Connector – OEM MG631660-5 / DJD031YA-1
Direct OEM-specification replacement for the Honda 3-pin H4 headlight lamp holder connector. Cross-references OEM part numbers MG631660-5 and DJD031YA-1. Used in H4 halogen headlight harnesses across Honda Accord, Civic, and Fit platforms. Available bare or with 15cm pre-wired leads.
| OEM Number | Application |
|---|---|
| MG631660-5 | Honda H4 headlight connector — primary |
| DJD031YA-1 | Honda H4 headlight connector — alternate |
| Pin | Function | Failure Symptom if Corroded |
|---|---|---|
| 1 | Low beam filament power (+12V) | Low beam not illuminating |
| 2 | High beam filament power (+12V) | High beam not illuminating |
| 3 | Ground / chassis earth (shared) | Both low and high beam out simultaneously |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Bulb Type | H4 (dual-filament halogen) |
| OEM Part Numbers | MG631660-5 / DJD031YA-1 |
| Housing Material | High-temp nylon (PA66) |
| Wire Option | Bare connector / 15cm pre-wired leads |
| Application | H4 halogen headlight harness |
| Compatible Brands | Honda |
Q: Both my Honda low beam and high beam are out — is it the connector?
A: Both beams out simultaneously on an H4 headlight indicates a corroded ground pin (Pin 3) in the 3-pin connector rather than a failed H4 bulb. Inspect the connector before replacing the bulb.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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