I have a 2007 STS V6 AWD, with the Bose upgrade, but without the Nav package.

I want to add a Pioneer AVIC-Z110BT with XM and the iPod adapter.

The problem I'm having is that no one (I can find) makes a wiring harness that will keep all the car's features like Steering wheel controls, On-Star, etc)

Does anyone know how to get a good aftermarket Nav, iPod controller, XM radio with traffic, DVD player to work.

Thanks in advance.

Bobby