| Number | X-pin, colour | Description |
|---|---|---|
| X3591 | 8-pin, Black | Plug connector Microphone |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Signal Microphone | Intercom control unit (WSA) |
| 2 | E | Positive input signal, speaker | Intercom control unit (WSA) |
| 3 | E | Signal Microphone | Intercom control unit (WSA) |
| 4 | E | Negative input signal, speaker | Intercom control unit (WSA) |
| 5 | E | Signal Microphone | Intercom control unit (WSA) |
| 6 | E | Ground | Intercom control unit (WSA) |
| 7 | E | Signal Microphone | Intercom control unit (WSA) |
| 8 | E | Activation Microphone | Intercom control unit (WSA) |