What model and year? Generally (i daresay always) a new head unit will have its own pairing and operate independently of any OEM software.
Chevy malibu, 2009. I think you're right, but the more I research new head units, the ones with XM radio are damn expensive (and I really want to keep my sat radio. I guess I could do without it but I'm pretty dependent on it now - I love it) Thanks tho, I'll think about just replacing the stock speakers and see what that does.