| Number | X-pin, colour | Description |
|---|---|---|
| X503 | 4-pin, black | Plug connector Light switch |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | M | Ground | Ground connector |
| 2 | E | Lighting, light switch | Light module |
| 3 | A | Signal, parking light ON | Light module |
| 4 | A | Headlights ON signal | Light module |