Please, stereo diagram for 2004 silverado

I want to install aftermarket deck and am afraid to mess up any computer functions ran through the stereo. I really need a stereo wiring diagram for the basic work truck am/fm cd player. I would greatly appreciate this alone, but an interior schematic (for speaker & amp installation) would be great. For anybody that can help, thank you very much. Although I cannot find this, I am very adept on the computer/internet, and would be more than happy to return the favor.Prometheus

If you are planning to install an aftermarket head unit, there is a databus interface available from Metra(part VT-GMRC-01) that will keep the databus functions intact and supply a switched power output for the aftermarket deck(factory decks don't have a switched power wire in the harness). As far as speaker colors, I'm not 100% sure but they should be the same as older pickups.