central locking fault?

Hi again, no further with airbag fault,now have new problem, went to start car today and battery flat,neighbour said he could hear a noise at nightime like clicking. Last time I used car interior light came on when driving and central locking made on/off noises when on the move. there was no showing of a door open on dash display. the battery was that flat I had to reset radio code and something was obviously drawing current when I attached jump leads as good spark connecting earth cable to engine block. The only good thing is the electric controls on drivers seat have started working again,,but no tilting door mirrors in reverse. any ideas kind regards paul.