Extra connector on the K12 Blaupunkt Nissan MMR CD-G - what is it for?

Ok, I have an '05 Blaupunkt Nissan MMR CD-G, and as well as the standard ISO connectors for power and speakers... Today I noticed that there was an extra connector in addition to the ISO and aerial connectors, and something was connected to it.

Does anyone know what connector this is and also what is the pinout?

Would I be able hook an MP3 player up to it at all?

Thanks.
 
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