Stereo wiring diagram needed to install a new Head Unit?

The attached are the wiring for the base version. Keep in mind that the data buss is part of the security system as well as the section that creates all the warning chimes. If the unit you are installing has an interface for that please test it out before you drive it. There are quite a few units sold the purport to work that tend to mess with the vehicles networking. Also be very careful if you try to interface with the on-star and phone. GM no longer supports any of the audio systems in that car. If one fails, you will need a lot of luck to repair it.

Okay, the wiring diagram I attached should cover it then as that is the base audio system. It is interfaced with the car; GM uses the radio for more than just sound and as such it is on the network.