I have noticed on my Ultimate Advantage that if I lock the door with the switch on the dash, that I can not manually unlock the door from the inside -- have to use the switch again. We no longer use the lock switch on the dash just to avoid this issue. I don't know if the dash switch activates some type of "child lockout" and the dash is the only way to unlock after activated or not.
Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny
'13 Ford Edge, InvisiBrake