Quote Originally Posted by s1795so2 View Post
I meant the part number on the harness. On our cars with onstar and bose, and wanting to keep both functional it takes about 100 dollar harness. If you just have onstar, the 20 dollar harness will work, the onstar wont work with that though. The bose amp will not work without the special harness.

Either way it should be a plug and play as long as u got the right harness.
Hey Steve,

You're saying that with my 03 GTX that has the Bose Amp and Onstar all I have to do is buy the special cable to keep the use of the Amp and factory speakers with a new headunit?

Let me know seriously.

James