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Northwest Chapter
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OK, here goes.

Been through this on my 02 with indash changer and Bose. The year and changer kill every aux or iPod input on the market, PERIOD. When you press the CD/Aux button no signal is sent outside the radio, so you can connect whatever you like but it will never get the signal to start outputting sound.

What you need is a wired FM modulator. Do not get the cheapo wireless ones that sound like crap, buy a good wired one and the GM->Motorolla and Motorolla->GM antenna adapters. I bought mine from crutchfield for about $55 shipped 3ish years ago. Works great, and sound quality is very good compared to the Belkin wireless modulator I have (and never use). Not as good as a true aux input (CD quality), but decent (strong FM radio quality).

Never heard of anyone wiring RCAs into the wiring, doubt it would work but if you want to try give it a shot.
 

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Northwest Chapter
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i already have an inline FM modulator that works, but i dont like the quality, i would like a higher quality, and i lose radio reception with it, so i would like to skip the modulator all together and go strait to the aux, even if i have to make my own, (i hope i can) thanks to the post above i have the pinouts of the lines that i need, but i dont know if there is a line that must recieve a specific signal to accept aux, or maybe a short with a resister in the middle, i have seen both types of setups on other projects, but i dont know what is on this radio, and it is really hard to work without a pinout.
I bid you good luck, I looked at this for a solid 6mo and the best I got was the inline wired FM modulator. I bought a PAC Aux adapter, it didnt work and sat until last March when I got the SS. First thing I did to it, the Saturday I picked it up the aux adapter went in that night.

Wait, how did you lose radio reception with it? Mine has a switch, I leave it off when Im using the radio and turn it on to block all antenna signal and use aux...

I would try and find out how GM outputs the signal to the rear DVD player, thats probably your best bet. Mimic the rear DVD being turned on (but that might just cut the rear speakers, what it does in the SS).
 

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Northwest Chapter
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call me stubborn, (cause i really am) but i like my stock radio much better than any aftermarket radio, although if i do switch it out someday, i will probably switch it out for the same radio, of a couple years newer so i can have my same stock radio feel, while getting my aux inputs that i want.

The part that i hate the most about this whole ordeal, is that i cannot find a pinout of that 12 pin connector anywhere i look.
You CANNOT do this Im afraid, 02-03 radios are year specific. Maybe if you rewire the connections it *might* work, but I believe the comm lines are different. And even if you do this, you'll still have to buy an adapter.

I like the look of the factory radios too, there are only a very select few I would consider replacing my changer in the 02 for.

Im checking my copy of GM TechLine, let you know if I get those pinouts.

Im still not buying your reception sucks, mine is PERFECT with the switch off (and the appropriate GM->Motorola and Motorola->GM adapters)...have you checked your connections?


EDIT:
Found the wiring pinouts for the rear harnesses. There is no audio in signal anywhere, you'd be splicing in pre-amp and hope the Bose amp ups the signal to a decent strength. PM me and Ill email them to ya.
 
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