On later models there are issues with the WBO added locking for the coach door overloading the Mercedes control module. There is a modification that should be done, and if it has failed, the module will have to be replaced by the Mercedes dealer AFTER the mod is completed.
Did you try locking the doors TWICE in a row? As in press lock, wait a few seconds and press lock again?
The Sprinter lock system was designed by escapees from the insane asylum and makes no sense. One press reverses the state of locks, but the second press finally gets them to all agree.
2008 Thor/Dutchman Freedom Spriit 180, 20 ft basic travel trailer towed with a 2003 RAM 2500 CTD, 6 spd manual. Temporary until I find my lifetime trailer.
SOLD--2007 Winnebago View 523H,