hi all, I started getting a problem with the central locking as the rear door would lock but would not unlock, I had to use the key. I ordered a new rear door lock unit and have fitted it thinking it will be the answer, but it still is just the same locking with fob but not unlocking??? I have checked the wiring loom from the lock to the connecter inside the back panel behind the light cluster and all the wires pin out contunity? whats next???