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That is an indicator of a failed lock solenoid in the door latch.
broken linkage inside the door, remove internal door panel and inspect all links from lock to motor
The expedition door lock relay could be stuck causing the grinding noise. Check to insure that the lock relay is working properly.
The door lock actuator is going bad.
I need to know how to repair the power lock on my corola dx 95 rear right door the door panel must be removed there is a electronic lock solenoid that controls the lock eods to door latch. if it grinds or makes noise replace solenoid if there is no noie check for a 12volt signal at plgs to lock solenoid if ther is no power sometime wire breaksin the door jam harness from opening and closing door wires bend back and forth and are known to break 80 % its the lock solenoid
The lock actuator has failed on whichever doors are making the noise. The actuater is serviced with the door latch.
The lock actuator is going bad. The actuator is part of the latch.
I just bought a 1997 accord with this problem. It turned out to be a small rubber piece inside the lock actuator. It stops the solenoid at the end of the gear which locks the door.
Try cleaning the spring loaded contact points between the door and the door jam. Both the points and the door contact get dirty. I've cleaned them with a good pink pencil eraser and very fine sand paper. Good luck.
Mine does that if the window is barley open!
More than likely the gears are stripping on the door lock actuator and will soon fail to work.
If your front door lock make no noise when the lock/unlock is pressed on your keyless entry it's a very good chance the door lock actuator is not working and will need to be replaced. Est Cost $46 for the part and about $115-130 in labor.