Why is my mercedes Benz S-500 rear passenger door not opening Stuck?
If it isn't the child lock engaged, then the lock is broken. To check the child lock, open the door from the OUTSIDE; the lock is a switch located on the door jam itself.
Search Mercedes-Benz S-Class Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercedes-Benz S-Class Experts