Thanks for the advice. Forgot to mention that the alarm system can still be activated with the key fob but not the central locking. Also, if I manually lock the drivers door from the inside the central locking only locks the drivers door and tailgate but not the other doors. When I repaired the body to tailgate wiring, it was because the rear wiper stopped working. I found 4 wires broken. Hope this throws some light on the subject.