I know this reply is a bit late, but if you ever need it, much wiring info for Subarus can be found at http://www.northursalia.com/modifica...ng/wiring.html.
im currently working on a CarPC for my 04' Subaru WRX and it has the premium sound package. i am looking for information on hooking the carpc to the premium sound package amplifier. im capable of tapping in to the wiring as long as i have a schematic of some sort. i would also like to know if there is a premade cable that i can buy that will tap in to the premium sound amp and provide some kind of jack whether it be RCA or headphone type.
i have done a bit of searching but havent found anything on this type of carpc hookup.