I was told.. the pxgm24 will work if you take the volume and rapidly go up and down on it and the volume is perfectly in sync with your turning. I can't really say why, something about the data bus? dont recall.. either way I think you probablly dont have the Y91 or Y92 or LUX package, so you can probablly use a pxgm24. the pxgm12 really deals with non-bose equipt rides.
I use a pxgm24 in my 2003 silverado LT with the bose system, its non lux and does not have y91 or y92 (these have something to do with that 05 nav. hu thats so popular.. JEEZ $2100 for a retrofit! no thank you!) I love mine. For the past... well since I got the truck in 03.. I have been using the pxgm24 and a RCA to headphone jack, drilled a small hole in the bottom pocket of the front of the console and ran it into my ipod in a belkin cupholder... works wonderfully.. but I'm on my 2nd ipod to die in 2 years.. so I wanna carputer or something to try and... FISSIT..
if you dont mind me asking, what are your carputer plans? I was looking at relocating the stock bose deck somewhere.. and putting a screen in the dash.... so far.. lots of planning before spending a cent.