85 monte carlo power door locks stopped working?

Fairly simple system there. Check power at the switch. If no power there, check the wiring going from the switch back to the breaker in the fuse panel. If power is at the switch, make sure the switch works and power is going to the lock solenoids that move the linkage. Like any electrical item, you also need a good ground for anything to work. The system is "hard wired" so don't look for a relay.