the central locking is playing up. the rear passenger door isnt working via central locking. i have to use manual lock inside car. key fob died ages ago so just use key in drivers side. when i unlock drivers side not all door unlock. i can be 5 or 10 minutes when they decide to unlock. (very unnerving for new passengers who think i have locked it again all of a sudden!!!) sometimes it works first time other times it delay until it feels like it.

many thanks for help