| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | A | Signal Left microphone | Microphone amplifier, left |
| | | |
| 2 | A | Signal Right microphone | Microphone amplifier, right |
| | | |
| 3 | A | Shield | Microphone amplifier, right |
| | | |
| 4 | A | Shield | Microphone amplifier, left |
| | | |
| 5 | A | Shield | Handheld microphone, intercom system |
| | | |
| 6 | M | Ground Intercom control unit (WSA) | Ground connection X494 |
| | | |
| 7 | A | Activation Intercom control unit (WSA) | Handheld microphone, intercom system |
| | | |
| 8 | E | Voltage supply terminal 30 | Fuse, Protection F71 |
| | | |
| 9 | A | Signal, switch off consumer load | General module |
| | | |
| 10 | A | Negative input signal, speaker | Handheld microphone, intercom system |
| | | |
| 11 | A | Signal Left microphone | Microphone amplifier, left |
| | | |
| 12 | A | Signal Intercom control unit (WSA) | Handheld microphone, intercom system |
| | | |
| 13 | A | Activation Pneumatic speaker | Connector X3250 |
| | | |
| 14 | | Not used | |
| | | |
| 15 | A | Signal Intercom control unit (WSA) | Handheld microphone, intercom system |
| | | |
| 16 | E | Signal Rear left door contact | Rear left door contact switch |
| | | |
| 17 | E | Signal Rear right door contact | Rear RH door contact switch |
| | | |
| 18 | E | Signal Driver's door contact | Driver's door contact switch |
| | | |
| 19 | E | Signal Passenger's door contact | Passenger's door contact switch |
| | | |
| 20 | A | Signal Intercom control unit (WSA) | Handheld microphone, intercom system |
| | | |
| 21 | A | Positive input signal, speaker | Handheld microphone, intercom system |
| | | |
| 22 | | Not used | |
| | | |
| 23 | A | Signal Intercom control unit (WSA) | Handheld microphone, intercom system |
| | | |
| 24 | A | Signal Right microphone | Microphone amplifier, right |
| | | |
| 25 | A | Telephone mute signal | Radio |
| | | |
| 26 | M | Ground Pneumatic speaker | Connector X3251 |
| | | |