Power Door Locks Wiring Diagrams Please?

Power Locks not working. The actuator and switch work because during service the technician directly connected a powersource to switch and power locks work when hitting switch up or down. He told me something is wrong between battery and switch. And the only thing we can come up with is a wire. How can I find that wire when there's thousands of wires in a car? Any idea can I get a door lock wiring diagrams so I can see how it works?