The remote key fob for the renault megane scenic stopped working the central locking. Any idea to fix this?

I changed the battery, the light on the fob flashes, but it does not activate the central locking. It will start the car normally, so must be switching the immobiliser off.|||I have no idea how to help you, but I'm adding your question to my watch list, %26amp; passing it on to my contacts with the hopes that someone else there might have the answer for you! Good Luck!! D;)).