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I pulled my Shaker out of the dash to install my handsfree phone kit. There are no aux or RCA inputs on the back at all. As far as I've researched, no one has made a harness adapter to make use of the AUX button on the head unit. In fact, the maker of the head unit says such a thing can't be done. Not sure I believe that, but that's what they said.
Pins 1 and 2 are Line positive IN Left and Right.
Pin 3 is the shield or the black ground wire from the line cables.
Pin 4 is to ground to chassis ground and enables the Aux button.
Yuu go to Radio Shack... buy some RCA jacks... some wire... and have fun.
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