Originally Posted by
kowaltoboggan
Can't wait to get my tools and scanner as I feel there is much more in this car that has been messed with to make it work. *Note: I and the car are located in South Africa -- a right-hand drive country that has some XFs, but not many. Assuredly, parts are scarce locally, but Mercedes is here big time. Also, I have access to all US suppliers so can order what I need from them, ebay, etc. as long as the things are not made only for left-hand drive cars)
Will need to explore why none of the locks work. Am relieved to hear that they should all work in unison and look forward to getting them back to original working condition.
There is an air/vacuum pump under the hatches floor which opens and closes the doors, gas cap access, hatch, etc. There are air lines which run from this pump to the various locks. If the air pump is not working, then the key fob will not operate the lock/unlock function simply because the air pump is not working. Thus do not concern yourself with the key fobs unlock/lock function until you are certain the air pump is working properly. The air pump is also interconnected to the security system. (CLP/SSM). You can use the search term Water in truck in the search box upper right corner of the forum for more information.