Does anyone know the pinouts for an AUX on the Stock HU in the '04 WRX?

I found a similar thread for the Forester which does have an AUX within a 13-pin connector. ( Forester AUX (http://forums.nasioc.com/forums/showthread.php?threadid=459029&perpage=25&highlight=stereo&pagenumber=1) )

There has been some discussion of this in the Car Stereo forum, which would be a better place to post this and/or search for info. In a nutshell though there is no practical way to use the extra connector on the stock HU since it requires data communication with a connected device (external changer or whatever) to activate the inputs.