| Number | X-pin, color | Description |
|---|---|---|
| X53 | 9 -pin, Black | Connector Auxiliary fan high speed relay |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Activation Auxiliary fan high speed | Auxiliary fan motor |
| 3 | Not used | ||
| 4 | A | Signal High pressure switch | High pressure switch |
| 5 | Not used | ||
| 6 | E | Terminal 30 voltage supply | Fuse F22 |
| 7 | Not used | ||
| 8 | E | Voltage supply, terminal 15 | Fuse F20 |
| 9 | Not used | ||