Hello, I'm having a problem with the power lock in the rear left door on my 1999 Camry. All the power locks work, except for this one. Manual locking and unlocking with its knob works perfectly OK. Any ideas what to look for to fix it? Thank you!

Hello, I'm having a problem with the power lock in the rear left door on my 1999 Camry. All the power locks work, except for this one. Manual locking and unlocking with its knob works perfectly OK. Any ideas what to look for to fix it? Thank you!
The door lock actuator is the culprit. It is mounted inside of the door and connected onto the lock control rod. When it begins to overheat or becomes too corroded over time, it will become sluggish and eventually stop working all together.

Just like window motors, these have no maintenance to them.
If they fail, they will need replaced.

The door lock actuator is the culprit. It is mounted inside of the door and connected onto the lock control rod. When it begins to overheat or becomes too corroded over time, it will become sluggish and eventually stop working all together.

Just like window motors, these have no maintenance to them.
If they fail, they will need replaced.

Thank you, Captain Rich! I will check if I can get the part somewhere and hopefully replace it (I will let you know if it worked or not). Have a great day!

Rich is spot on. This a tricky job. Very tight space and need plenty of light to see.
Prepare to swear, sweat, and get cuts on this job for a do-it-yourselfer.
Step 13a through f in the pdf below will show you what you're looking at.

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