A little help please!

I need to know if anyone who has installed the factory nav on their 07 Tahoe w/out bose been able to retain their door chimes, onstar volume, turn signals, and rear parking assist sound? If you have done this let me know. Mine or not working even after installing an aftermarket amp.

have done many of these....you need to install an integration module if you haven't done so, and if you have, you need to replace it with one that is specific to your vehicle.
check out this link.....  http://www.pac-audio.com/databusVehicles/GMLANvehiclesdetail.asp?mmSearch=15