Rabid Platypus

I have this same issue. I was running amplifier wire through the harness plug on the firewall. 3 wires got cut on the sharp firewall edge and there was a spark. The car went bad, windows, interior lights, dash, blinkers, AC, heat, radio, everything stopped but the engine would start. I checked all fuses and patched up the wires but same issue. Sounds like I need to check the smart module for a cut wire? Do you think it could have been fried? How can I tell if it's bad?