Door Lock Problems

I have 97 Grand Carvan Sport. The door locks are giving me trouble. When I turn the key sometimes I get nothing, other times I get the locks dancing up
and down. I have to go to the rear to unlock the vehicle, but now even that is starting to not work at times.
I was told this could be the BCM , I already have replaced that.
PS. some times my wipers go on for a sweep then stop?
Where do I start?
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