| Number | X-pin, colour | Description |
|---|---|---|
| X53 | 9 -pin, Black | Plug connector Auxiliary fan stage 2 relay |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Not used | ||
| 2 | A | Activation Auxiliary fan stage 2 | Auxiliary fan motor |
| 3 | Not used | ||
| 4 | A | Signal High pressure switch | Connector, auxiliary fan stage 2 1994_4 High pressure switch 1995_9 |
| 5 | Not used | ||
| 6 | E | Voltage supply terminal 30 | Fuse F34 1994_4 Fuse F78 1995_1 Fuse F34 1995_9 |
| 7 | Not used | ||
| 8 | E | Voltage supply, terminal 15 | Fuse F38 1994_4 Fuse F20 1995_9 |
| 9 | Not used | ||