2004 Toyota Tacoma Automatic Door Lock Grinding Sound.

Can anyone diagnose and recommend what is occurring with my automatic door lock?
When I lock the door, I get a horrible grinding sound. This does not occur when I unlock the door.
This only occurs on the driver's side. See the 15 second clip below to listen.
Thanks in advance for anyone's help.

 

Sounds like the door lock actuator has failed.

 

This. Replace it and make sure you keep the next one lubed up. Same with the hinges, hood latch and tailgate latches. They build up with grit and cause more resistance on the moving parts. Maybe a little grease on the parts that move the window too.