John,
Here is the information I have, excerpted from Resellers (some) who have put up interchange information for their headunits.
There was a wiring change of some kind (as the result of a head unit change) beginning with '04 VIN ending 410661, in Mid 2004. These units also require (according to their information) dealer unlocking if units are not unlocked and no code is provided. There is a thread regarding a source for obtaining this code at a minimal cost via the internet. I had a similar situation in a GM product where there was a wire in the old harness that wasn't in the new harness (or visa versa I was swapping between two vehicles I owned), and when I clipped the wire the radio worked and all features functioned properly. Didn't work until I did.
Everyone who I have read about, attempting to do the swap you are talking about, has had issues. And I don't recall anyone who simply did a p&p swap with complete success.
My thoughts are, if you can buy the headunit reasonable enough to be okay if you resell it, give it a try. You CAN install ANY 6cd Changer (remote) Trunk Unit (not to be confused with the console unit, although it will p&p also) with your existing head unit. The harness, and mounting holes for the bracket, ARE in your trunk, and ALL years interchange.
Btw, the unit you are referring to, was installed starting in '05 (possibly even in the later '04s), with the remote jack. The jack was just moved from under the center dash console, to in the face of the console just to the left of the glove box door.
Hope this helps.
MORAV
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In der Automobil-Scheune
'02 NBT, A/T, Moonroof, Platinum Gray, Flannel Gray Leather Interior (Currently on the slab in the morgue, possible ressurection in the offing)
'05 NB Convertible, Tip 6sd, Dark Flint Gray Edition, Garnet Red Top, Bordeaux Red Leather Interior
'01 Corvette Convertible, Magnetic Red, Light Oak Top, Light Oak Leather Interior
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