I just installed a F900BT in a 2007 Suburban. This veh had all the options, Onstar, Bose, rear dvd, and steering wheel controls. I added a rear view cam also.
Right now it seems that everything is working, except for the Rear DVD. It works, but I thought that you were suppose to be able to listen to the radio upfront while the DVD is playing in the rear with the headphone on. The factory system worked that way. I did see in the manual where you can split the rear and front speakers but it was not clear on how to go about that.
I tried to do a search, but I could not find what I was looking