Hi, you have to turn the ignition on,then off and press either the lock or unlock button on the fob 3 times in 5 secs !!
You may need to repeat this process a few more times to get it re-set, mine took about 20 attempts..
Also if you log onto this link and register(its all free) the will give help and advice for leganza's...
http://www.daewooclub.co.uk/forums/forumdisplay.php?fid=10
rob, May 2008