| Number | X-pin, colour | Description |
|---|---|---|
| X1578 | 9-pin, Black | Plug connector Rear compartment blower relay |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | E | Voltage supply terminal 30 | Fuse F61 |
| 3 | Not used | ||
| 4 | E | Voltage supply terminal 30 | General module |
| 5 | A | Voltage supply terminal 30 | Water valve relay, rear compartment air conditioning |
| 6 | A | Terminal 87 | Output stage, rear compartment air conditioning |
| 7 | Not used | ||
| 8 | M | Ground | Ground point |
| 9 | Not used | ||