| Number | X-pin, colour | Description |
|---|---|---|
| X659 | 6 -pin, Black | Plug connector Lumbar support switch, passenger's seat |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Signal, upper chamber | Valve block, passenger's lumbar support |
| 2 | M | Ground | Ground connector |
| 3 | A | Signal, actuator | Passenger's seat lumbar support motor |
| 4 | E | Voltage supply terminal 30 | Fuse F13 |
| 5 | A | Signal, pump | Connector, pump for lumbar support |
| 6 | A | Signal, lower chamber | Valve block, passenger's lumbar support |