Here is what I show:
If you need further, let me know
you posted:Can you provide a schematic diagram for the Delco radio (Part NO. 09390762) in my 2002 Pontiac Grand Prix?
That is for the external wiring of that Unit:
if you are looking for the "internal" schematics for repair, pcb, etc, that is going to be hard to find.
Will OPT OUT & hope someone can help you