| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | M | Ground | Ground splice |
| | | |
| 2 | M | Ground signal | Voice input Microphone |
| | | |
| 3 | E | Positive signal | Voice input Microphone |
| | | |
| 4 | E | Telephone mute signal | Voice input Telephone connector |
| | | |
| 5 | E | Signal | Voice input Telephone connector |
| | | |
| 6 | E | Nighttime illumination signal | Telephone connector |
| | | |
| 7 | E/A | I-bus signal line | I-bus splice Telephone connector |
| | | |
| 8 | E | Voltage supply terminal R | Unloader relay, terminal R |
| | | |
| 9 | E | Terminal 30 voltage supply | Fuse F57 |
| | | |
| 10 | E | Signal, terminal 58g | Eject box |
| | | |
| 11 | E | Terminal 30 | Eject box |
| | | |
| 12 | E | Terminal 31 | Eject box |
| | | |
| 13 | M | Ground signal | Eject box |
| | | |
| 14 | | Not used | |
| | | |
| 15 | M | Shield | Shield Microphone |
| | | |
| 16 | M | Audio ground | Eject box |
| | | |
| 17 | M | Terminal 31 | Ground splice |
| | | |
| 18 | E | Terminal 30 voltage supply | Fuse F57 |
| | | |
| 19 | | Not used | |
| | | |
| 20 | | Not used | |
| | | |
| 21 | | Not used | |
| | | |
| 22 | | Not used | |
| | | |
| 23 | | Not used | |
| | | |
| 24 | | Not used | |
| | | |
| 25 | | Not used | |
| | | |
| 26 | | Not used | |
| | | |
| 27 | | Not used | |
| | | |
| 28 | M | Shield | Eject box |
| | | |
| 29 | | Not used | |
| | | |
| 30 | | Not used | |
| | | |
| 31 | | Not used | |
| | | |
| 32 | | Not used | |
| | | |
| 33 | | Not used | |
| | | |
| 34 | | Not used | |
| | | |
| 35 | | Not used | |
| | | |
| 36 | | Not used | |
| | | |
| 37 | E | Signal Eject box | Eject box |
| | | |
| 38 | E | Signal Eject box | Eject box |
| | | |
| 39 | E | Signal Eject box | Eject box |
| | | |
| 40 | E | Signal Eject box | Eject box |
| | | |
| 41 | E | Signal Eject box | Eject box |
| | | |
| 42 | E | Signal Eject box | Eject box |
| | | |
| 43 | E | Signal Eject box | Eject box |
| | | |
| 44 | E | Signal Eject box | Eject box |
| | | |
| 45 | E | Signal Eject box | Eject box |
| | | |
| 46 | | Not used | |
| | | |
| 47 | | Not used | |
| | | |
| 48 | E | Signal Eject box | Eject box |
| | | |
| 49 | E | Positive signal | Eject box |
| | | |
| 50 | | Not used | |
| | | |
| 51 | | Not used | |
| | | |
| 52 | E | Signal Eject box | Eject box |
| | | |
| 53 | M | Ground signal | Voice input Telephone connector |
| | | |
| 54 | E | Positive signal | Voice input Telephone connector |
| | | |