sorry not to help you but i have similar issues. My boot does not open unless you use the key (some what annoying) But as of a few weeks ago sometimes the central locking worked sometimes it doesn't. So i replaced the battery. It worked yay BUT now it does not work at all AND if i use the key only the driver door opens (SOME WHAT MORE ANNOYING). I am going to start by checking fuses, battery connection and re syncing the key (maybe by leaving it in the ignition pressing lock then unlock not sure yet have to look that up) anyone else got a decent answer????
Phil
July 2012