95 Tahoe rear lock problem

I have a 95 Chevy Tahoe 4 door with the rear barn doors. The power lock feature will not work on rear door. The front 4 doors can be locked and unlocked from either the remote or the door switch, but the back will not work from either location. If I stay quiet and press the "rear" button on the remote I can hear a clicking under the front dash, but no sound from the door. Are there any relays I could check? I cleaned the contacts to the door and ran a voltage check at the pins and found a pin the changed voltage when the lock button was pressed but it moved less than a volt (although it could have just been faster than my meter would pick up). I figure it is probably the actuator but I thought I would check before I dig into that project (I hate tearing doors apart). Thanks.

Check the lock mechanism in the rear door....all of the door locks are controlled up front.

Does it work with the OE switch?