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The first thing to check is the switch. You can check it with a multimeter device with a continuity checker or ohm meter. The switch is usually on the door handle and in most cars it is held on by one screw. Remove the screw then slide the door handle either forward or backward then pull out. This will expose the wire harness to the switch. Disconnect it and remove the switch to test.
Also you can just run a hot and ground wire off a 12 V battery directly to the connect points where the switch plugged into the wire harness. If the problem was in the switch this will bypass it and open your door locks once you touch both the hot and ground wire to the contact points. There will be one common ground contact point and two hot contact points. One hot is for locking and the other is for unlocking. Touch the negative wire off your battery to the common ground then touch the hot wire off your battery to each of the other two contacts separately to see if both are working.
If the switch is working then the problem may be a disconnected wire harness, a shorted wire, a broken wire (open circuit) or faulty door lock actuators. To fix you must determine the source of failure then repair or replace what's needed.
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