Radio wiring diagram needed

Okay, thank you. I didn't see an ignition wire in the schematics. I am kind of confused about how the factory radio turned on, lol. But I don't know much about Chevrolet after the 1990s, but would it be okay if I ran it off an ignition source in dash if I could find one? Or do I need to make a wire to the middle of the car for the fuse block? I don't care to retain anything in the radio enough to spend $150.00 on an interface harness to hook it up "proper" way. Do you have any suggestions/knowledge on the best way to do it? Thanks

I need an ignition wire source to turn the unit on when key is on, not a battery source. Is it possible you could send me a schematic of the digital ac harness so I can see if there is one I can use to save me from test lighting every wire or maybe on the 4x4 switch. There is a cigarette liter and a 12v plug below the ac controls but I doubt they are switched power, most likely constant battery but wouldn't hurt to check them too I guess, lol.

Also, a schematic of the rear radio would be a great help too.