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Without having been able to look at the factory system, I would assume its the wiring harness that receives the AM/FM signal, power, etc and also sends the signal to the speakers. Someone correct me if I'm wrong! It does look like a regular wiring harness though.
 

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The white side of the plug goes to an aftermarket HU. The other side is the male side to connect to the female side of the car.

Typical wiring harness... carries power, ignition, ground, illumination, all speakers.
 

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Discussion Starter #4
but my original headunit has a whit plug with 16pins!!!
And I want to know, is this the right wiring harness!?
thanks edi
 
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