1990 Honda Accord 4 cyl Front Wheel Drive Manual 237000 miles
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After reading may of postings for faulty electric door locks I finally tore into my door and made a repair that may be beneficial to others.
I had a electric lock problem on my 1990 Accord. First the electric locks would work intermittently, then one day they quit working all together. It turned out to be a bad solder joint on the lock control module circuit board. The relay terminal that connected to pin #3 was broken and was easy to locate by looking for broken solder on the bottom side of the board. After heating the joint with a soldering iron and applying a dab of solder it works good-as-new.
The door panel had to be removed, the lock control module removed and then opened. It was really a fairly simple repair.
Maybe this will be of use to someone else. Since I didn't have to buy a new control module I saved $200--good news!

Hi ugaprof,

Such things do happen to electrical circuits and thanks for the feedback.