The schematics I added above should work. When you checked the fuses, is there power at that point?
Let me know. I have to be honest, they used what is called a totally integrated power module on these vehicles (TIPM). They have a ton of tiny pin connectors which are known to break, corrode, and not make a connection. So, we are going to have to work backwards on this.
If you haven't already (and I think you have), confirm there is no power to the radio. Next, at the fuse, confirm if there is power or not, and let me know what you find.
Friday, November 27th, 2020 AT 9:10 PM