Central Locking Unit not working

[11307]

I own a 94 C-Class 250 and the central locking is no longer working. Over a period of time it worked intermitently but now ceases to work at all. After a quick check on the connections it started to work ok -even though the motor would continue to whine for about ten seconds after I turned the key to open the doors.

Is the unit in need of replacement.

Any advise gratefully received

Steven Harrigan

 

[Zanimat]

I'm still new to all this, but if it were mine, I'd suspect a vacuum leak somewhere, unless the locks all operate within a second or two. Otherwise, it could be a connection problem in one of the front door or boot lock switches. When the system changes state, all 3 switches must "make" in order to turn off the motor. Try locking/unlocking from each door/boot in turn & see if one of them is a bit uncertain in operation......that would be the first one to check. Good luck!