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Hi Tony,
I'm speaking from my '89 200 experience.
The drivers door has a three wire dealy on the locking post. On my car I had a problem where I would unlock the door and sometimes all the doors would relock and unlock like it was possessed. Sometimes while driving I would hit a bump and all the doors would lock. What I found was that the Door locking post on the drivers door controls the locks on all the doors including the trunk. It was going bad so it was making connection to lock all the doors when it shouldn't and vise verse.
To replace this piece, you have to take the door panel off. I'm guessing the 700 series is very similar in '90.
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'75 Jeep CJ5 345Hp ChevyPwr and two motorcycles: it wasn't Volvos safety , it was Longevity that sold me
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