Central locking unlocking itself after 10min... not actuators

[DOHC-DJ]

hey guys, got a problem with the parents car. its a 99 fairlane ghia. the problem is when you lock the car about ten minutes or so later it unlocks itself. all the doors do lock so its not an actuator problem.

im led to think that its the bem, cause it controls the central locking side of things. im pretty sure its something wrong on the master door circuit. because all the doors unlock after 10min, and not just one of the slave doors so maybe the master door is unlocking itself and then the slave doors are copying the master.

has anyone else had this problem....