Some times the central locking works locks all the doors then 5 mins later or so it unlocks all the doors most of the time i have to manually lock each door but it still unlocks by it self aftet 5 or so mins

You mean it locks and unlocks randomly?

A few threads about that, have a search.

Yea searching sucks lol

Yea searching sucks lol

Repeating a couple of pages of information for the third or fourth time sucks too.

Try this:
http://www.aussiemagna.com/forums/showthread.php?t=100935&highlight=central+locking

and this:
http://www.aussiemagna.com/forums/showthread.php?t=100482&highlight=central+locking

and this:
http://www.aussiemagna.com/forums/showthread.php?t=93388&highlight=central+locking

Should be enough for the moment. lol