| Multi-pin connector 4, 12-pin, CD changer control and CD audio input signals |
| 1 - | Right headphone output signal, positive |
| 2 - | CD changer, left and right channels, negative |
| 3 - | Headphone output signal, audio earth |
| 4 - | CD changer, voltage supply, positive |
| 5 - | Left headphone output signal, positive |
| 6 - | CD changer, bus DATA OUT |
| 8 - | CD changer, left channel, positive |
| 9 - | CD changer, right channel, positive |
| 10 - | CD changer, control signal |
| 11 - | CD changer, bus DATA IN |
| 12 - | CD changer, bus CLOCK |
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