Mine is brand new - only 60 miles on it and has never been off road or driven in muddy weather. There is no dirt or corrosion (or misalignment, as far as I can tell). I agree .. that should work .. but it only does intermittently. If I have to spend more than a couple of minutes trying to open the slider with the fob, I open the passenger door and unlock it from the inside. The front doors unlock just fine and I often hear the slider sound as though it unlocked as well but it won't open. The slider closes and locks just fine. So far it is no huge deal but it definitely is not a great system imho. I am crossing my fingers it doesn't get worse over time .. I can deal with this idiosyncracy but no more, please!You should be able to push the bottom button on the key fob and open both the slider and rear doors. Sometimes the electrical spring loaded contacts don’t make a good connection between the door & the van because of corrosion, dirt or misalignment. I would check that first (it’s hidden on the left side on the door near the bottom) no photo any unfortunately.