| Number | X-pin, color | Description |
|---|---|---|
| X322 | 12-pin, natural | Connector Central arrest (ZV) |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Terminal 30 | B: Fuse F69 | |
| 2 | Terminal R | B: Unloader relay, terminal R | |
| 3 | Speed signal | B: Radio | |
| 4 | I-bus signal line | B: Amplifier | |
| 5 | Nighttime illumination signal line | B: Radio | |
| 6 | Not used | ||
| 7 | Not used | ||
| 8 | Telephone mute signal | B: Radio | |
| 9 | Front loudspeaker voltage control | B: Front loudspeaker | |
| 10 | Front loudspeaker ground control | B: Front loudspeaker | |
| 11 | Not used | ||
| 12 | Not used | ||