Hi:
This isn't a common problem or one I can answer without being there with you. I suggest that you conact an auto electric shop for them to diagnose the problem.
I do have one question. Does the van have the auto locking doors when you first go around 15 MPH? If so, that would work only when the key is on. This may sound too simple, but did you check the fuse for the door locks? If I remember correctly, there may be two seperate power supplies.
Joe
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Monday, October 6th, 2008 AT 9:51 PM