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Discussion Starter · #1 · (Edited)
I am attempting to retrofit a 2009 accent xm/mp3 headunit into my base model 2008. The 09 headunit supports and AUX in and USB. The AUX input has 4 wires but I do not know what the 2nd pair of wires are for. Here is a picture of the pinout:



the pins in question are 2-1, 2-2, 2-3, and 2-4

what are 2-3 and 2-4 for? AUX REF and AUX DET???
any help is appreciated.
 
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