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Looks like a VW connector, so I'd say CD changer connectivity (which is what VW uses it for primarily), also phone connectivity as well. The stock radio should have a wiring diagram on it and shed light as to what they're used for.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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