Greetings!
If the fuse keeps blowing when the locks are actuatusted, there are only 2 likely causes that I can think of:
(1) There is a short circuit between a lock actuator power feed and ground or another wire in a harness. If the wiring harnesses have not been altered, about the only location where this commonly occurs is at the point where the door harness exits the A-pillar and enters the door. The harness flexes in this area whenever the door is opened and closed, so after a few years broken wires in this area are common.
(2) The fuse will also blow if the currect draw for one of the lock actuator motors is excessive. To test for this, an ammeter is installed in the circuit (usually at the fuse block), and current requirements for the various lock actuators is measured as they are operated. If one actuator has a higher amperage requirement than the others, this would indicate either a sticking mechanism inside the door that is putting a heavy load on the motor, or a motor with shorted internal windings.
If no wiring problems or faulty lock motors are found during testing, it is a possibility that the body control module on this vehicle may have an internal fault.
I hope this is helpful to you! If so, an accept would be most appreciated! Thanks!
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