Schematic, no. Check shbox, i think he had something for internal wiring, or at least links to somewhere. That switch is crappy. If i remember right, you have to pull the wires from the connector in order to remove it, as in you gotta pull the pins out of the switch assembly. Doing this without the proper tools, causes it to become loose and crappy connection. I couldn't figure out how to get the switch removed from the wires to remove the dash entirely.
This was on a 96 TA, i assume Chevy used the same switch. I could be a dingus and just never figured out how to remove the switch, power is constant if i remember correctly, going off aging memory and a 4th daughter since i got rid of my last Trans Am.