No interior chimes, OnStar, etc with aftermarket radio
It seems like everything goes through that OEM radio.
Chimes, On Star, Bose amp, steerinmg wheel controls, rear audio controls etc.
When they installed the Clarion DVD radio, they removed the Bose Amp, rewired the whole car, and now none of the above works and the installer is not able to get the GM04 adapter to work, but he was able to wire in the steering wheel controls. They work great.
Sense the OnStar is so out of date and not usable anyway I don't care about that, but I do wish I could get my chimes back and maybe my rear audio controls.