Since the lock actuator receives power from the same source as the doors, it isn't a fuse-related issue. Here is the not-so-good news: The power lock motors are integral to the door latch units. The power lock motors cannot be adjusted or repaired. If inoperative or damaged, the door latch unit must be replaced. So with that, we need to confirm there isn't a broken wire or connector issue.
If you look at the pic below, I attached is a pic of the actuator location and two pics of the connector to the lock actuator and what each pin in the connector does.
The pins you need to focus on are numbers 1, 2, and 4.
Using a test light, voltmeter, or multimeter, check for power to pin #1 when a helper hits the unlock button, power to pin 2 when hitting the lock button, and then check for continuity to ground on pin 3.
If pins 1 and 2 have power and pin 4 has ground, the actuator motor is bad.
Here is a link you may find helpful:
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Wednesday, May 12th, 2021 AT 9:01 PM