The doors unlock after I start the car. But the same sound occurs when, after driving around, and the locking the doors.

There seems to be some unit under the dash that may leak. Some other forum members also have experienced such a low pitch sound that comes from under the dash.


It stops once all the doors have unlocked or locked?


I agree it some vacuum leak. It is not in the door circuit or the vacuum resevoir in the trunk.

Does someone have a vacuum diagram for the central locking system ? Seems to me the problem lies in the cabin.