| Number | X-pin, color | Description |
|---|---|---|
| X3812 | 5-pin | Connector Microphone amplifier, left |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Signal Left microphone | Plug connector, driver's door X3248 |
| 2 | E | Shield | Intercom control unit (WSA) |
| 3 | E | Signal Left microphone | Plug connector, driver's door X3248 |
| 4 | A | Signal Microphone amplifier, left | Left microphone |
| 5 | A | Shield | Left microphone |