Hey,
Brand new to the forums and just got a 2005 grand prix gt2 about a month ago. Dilemna is, I want to replace the factory head unit with something like a sony A/V, Navigation and Bluetooth unit but I want to make sure everything will work as normal. My car is equipped with the Monsoon Sound System(Fantastic BTW), HUD, DIC, OnStar, remote start and steering wheel controls. I have been searching the forums before posting and it seems to me that an AXXESS II OS-4 harness or a PAC OS-4 unit should do the job, but not 100% sure. Want to be 100% before spending close to a grand.
Thanks.
