Need help with carputer

My friend is setting up a carputer for me but first i needed to get some questions answered. How do you make the media button an aux input so it can work with the carputer, i dont have a tape player so right now the media button has no use.

Thx
-Chris
 
you need auxmod, 3.5 mm headphone jack from your carputer into the auxmod......and then you enjoy the sound of whatever through the speakers
 
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