| Number | X-pin, colour | Description |
|---|---|---|
| X322 | 12-pin, black | Plug connector N9 Radio/Top Hifi |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | Terminal 30 | B: Fuse F69 | |
| 2 | Terminal R | B: Unloader relay terminal R | |
| 3 | Speedometer (A) output signal | B: Radio | |
| 4 | I-bus signal line | B: Amplifier | |
| 5 | Signal line, night lights | B: Radio | |
| 6 | Not used | ||
| 7 | Not used | ||
| 8 | Telephone mute signal | B: Radio | |
| 9 | Positive activation, front loudspeaker | B: Front loudspeaker | |
| 10 | Negative activation, front loudspeaker | B: Front loudspeaker | |
| 11 | Not used | ||
| 12 | Not used | ||