It's a 1999 pontiac sunfire GT. The stock stereo has an FM/AM stereo and a CD player.
Also.. a breakthrough!
Well, this chip obviously can do something, though it lacks a lot in what I was looking for.
I connected my 3.55mm jack, playing music to ground and the inputs 1, 2, 3, and 4. These each went to separate speakers. I then connected it to pin 10, which is labelled SVR on the data sheet and music comes through every speaker from my mp3 player. The music comes through whether I'm using the CD player or Radio function on the stereo.
Thing is, I can't control the volume on the stereo's dash itself, or use any of the features (I can't choose balance, fading, use the EQ, volume knob, etc...) and the music lacks some mid tones (though I may just need to change capacitors). Along with that, it's not true stereo. The music is balanced from left to right, but instead of sounds that would normally be on the left speaker, they're simply quieter so you get an echo rather than a panning effect.
Any suggestions on where I would find a different connection that would allow me to use the dash functions (like volume) when using the AUX input? pin 10/SVR doesn't trance back to anywhere, just the chip itself.
Thanks in advance..