I have an unusual fault with my 2005 golf. The doors will not unlock remotely nor will they unlock by the unlock button inside the car. The drivers door will unlock manually by turning the key in the door lock. The only way to unlock the other doors is to open them manually from inside the car. The key fob doesn't unlock or lock the car but the red button flashes when you press the fob. All of the doors lock when you manually lock the car by turning the key in the door lock.
The central locking button inside the car only locks the doors whether you press it to unlock or lock. I have tried changing the body control unit and synchronizing the key fob but no joy. Any help and advise would be great! Thanks in advance.