Had a similar problem in my '90 J**p Cherokee. Affected only left front and right rear doors. Troubleshot electrics, cleaned and lubed lock mechanisms, no fix. Learned to live with it for the last 2 years. Replaced negative battery cable a couple of months ago for massive corrosion...they now work! Try cleaning the body ground strap connections and replacing negative battery cable.
C.J.
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Dad said, "Sometimes you read Job...sometimes you ARE Job!"
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