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Ho, I was just wondering if anyone would happen to know what the 4th pin on the back of the VW aux input sockets does, (such as part 6R0035724) as there are 4 pins. 3 of the pins are audio signal earth, left and right. Although I am unsure of the purpose of the 4th pin?

the fourth wire is the GND for the isolation sleeve around the wire

iichel wrote: Sat Mar 03, 2018 7:32 am the fourth wire is the GND for the isolation sleeve around the wire

Cheers