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No those problems are not related one is simply a switch that needs to be replaced and the interior handle problem can be fixed with a minor adjustment, the metal plate the inner handle cable attaches to gets bent after a while which keeps it (the cable) from pulling with enough force to unlatch the door and initiate the motor to open the door. Remove the door panel and you will see the metal plate in question, simply take a flat headed screwdriver and bend the plate back toward the inside of the van and give it a test pull. Let me know if i can help with anything else!
No the switch is on a completely different panel, that would be the power sliding door switch.
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