92 Gr. Caravan Power Locks Diagnosis

Anyone have experience diagnosing a powerlock problem? Lock switch
works fine on passendger side. It unlocks and locks all locks fine.

Drive side locks fine, but doesn't unlock. I've got Chilton's manual
for it, but can't make crap out of power locks. Is there a "common"
reason for this on these models (maybe a sensor or something)?

I changed the switch from the other side and it does the same, so I
know it's not the switch. I did some general "looking" at the wiring
and didn't see anything obvious.

Thoughts? Thank you!

check the wiring harness between the door and the body where the door
hinges are. the unlock wire is probably broken.

Started there, but just did general looking at the harness area.
Before I started "unwrapping" things, I wanted to get a sanity check.
Thanks!

You have experience with this particular problem? Is this the common
reason for this type of problem? I was wondering if the actuator on
the door latch itself could be a problem? I can't find a wiring
diagram for this component of the van.

Thanks again!!!!