Chevrolet Repair: G20 Van central locks, barn doors, front doors

Question
The vehicle is a 1989 Chev G20 van. The electrical central locks will lock, but not unlock. No sound or anything. The system was working fine until just this week.

There is a switch just like the electric windows on each of the front doors. The side has barn doors, and the back as well. All doors lock with either switch..

Thanks

Brooke

Answer
Hi Brooke,
Looks like that uses a relay for the door locks, and it must not be making contact in one direction.
Find it, and swap it with one of the other relays with the same part number. like blower motor relay, maybe.

Go look at the wiring diagram at:

http://www.autozone.com/az/cds/en_us/0900823d/80/17/15/42/0900823d80171542/repai...

Scroll down to Fig 39.

Van