| Multi-pin connector 4, 12-pin, CD changer control and CD audio input signals |
| 1 - | Headphone output signal, right, positive |
| 2 - | CD changer, left and right channels, negative |
| 3 - | Headphone output signal, audio earth |
| 4 - | CD changer, voltage supply, positive |
| 5 - | Headphone output signal, left, positive |
| 6 - | CD changer, DATA OUT (data exchange for CD changer control from radio navigation system to CD changer) |
| 8 - | CD changer, left channel audio output, positive |
| 9 - | CD changer, right channel audio output, positive |
| 10 - | CD changer, control signal |
| 11 - | CD changer, DATA IN (data exchange for CD changer control from CD changer to radio navigation system) |
| 12 - | CD changer, CLOCK (internal check protocol for data flow monitoring) |
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