central locking

[glen hayes]

thanks for all the help with the batteries for the key fob for my 306 xld, however the central locking does not operate from the remote, every door opens by opening the drivers door, but none by the remote, the fob does not show any lights when pressed,(the small one on the fob), anyone know what to check next b4 i go to a dealer (i'm not bad with the spanners) thanks in advance.
glen