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No. I't Doesn't. I tried to install a GM-24 from Pac-Audio which is supposed to work but it didn't. Others have tried it also and couldn't get it to work. Pac-Audio still says it should work but so far I haven't heard of anyone who has got any aux input to work on the 6 disc unit. The nav unit is different. Some have successfully installed aux inputs on the nav unit. Do a search on aux input and check the FAQ thread. Lot's of discussion on this issue.
If you don't have the XM radio, you may be able to ride it's inputs. I think it could be done but and waiting for 1 more connector before I can tell you for sure.
Unfortunately, based upon my experience, and the experience of several other Forum members, this unit does not work on a 1SB car with Nav, XM and Onstar. Go to this thread for the full discussion:
Unfortunately, based upon my experience, and the experience of several other Forum members, this unit does not work on a 1SB car with Nav, XM and Onstar. Go to this thread for the full discussion: