Central locking problem (remote locks doors but won't unlock; alarm works normally)

Hi!

I have chevrolet aveo 2008 sedan. Key with 2 buttons lock/unlock and trunk open.

Central locking stop worked like it should.

If I push lock/unlock button at key the doors goes locked and alarm goes on and says "beeb" like it should.

But here is the problem: When I go to a car and press lock/unlock button alarm says "beeb" but doors don't open, so I need to open the doors by drivers side with key.

If I dont open the doors with the key and just keep pressing the lock/unlock button i heard "beeb" every press but doors open only if I use the key on drivers side lock.

When I am in the car and pushing or lifting the lock knobs they only locks the door which I use, central locking dont work by knobs.

Using key for passenger door opens and closes only that door.

Is there somekind of "central locking module" or relays what I can check?:confused:

Seems like other people have had a similar but opposite problem (doors will unlock remotely, but not lock remotely; alarm works OK).

Some ideas in the thread:
Thread: Remote will unlock but not lock doors