which is moving with a good non-dripping grease. I use grease for motor bike drive chains. This also helps in winter time that the mechanism gets frozen when car is parked outside. After that don't install the door panel, just actuate the lock several time so that the grease goes inside the moving parts. Then try again and when it works attach the doorpanel again.

In the attachment is the explosion drawing. Unfortunately you have not in your profile year built/engine/manual or automatic etc. which would help much in future to answer questions. Maybe you add these items to your profile.

click here