| Number | X-pin, colour | Description |
|---|---|---|
| X56 | 9-pin, Black | Plug connector Horn relay |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Signal | Left horn |
| 3 | Not used | ||
| 4 | A | Horn signal | Horn switch |
| 5 | A | Signal | Right horn Connector, fanfare horns (Taxi only) |
| 6 | E | Voltage supply terminal R | Fuse F38 |
| 7 | Not used | ||
| 8 | E | Voltage supply terminal 30 | Fuse F3 |
| 9 | Not used | ||