My passenger side door will lock with the door button but not unlock from the passenger side. From the drivers side, you can unlock and lock all doors including the passenger side front door. I swapped out the button from the drivers side to the passenger side and still no luck in unlocking the door on the passenger side so to me this ruled out a bad door switch. Co-incidentally, the power sliding door(passenger side) will not automatically open, so I am wondering if the two problems are associated. I had read about a common problem with a joined wire in the harness under the carpet that could be corroded etc but was wondering if anyone else has had this problem and what you may have found to fix it. My montana is a 1998 transport version. Thanks