54 reg locking problem
 

I have owned this 1.9tdi for over a year but now the central locking is acting up...It locks fine on the key fob but when i unlock it the only door that unlocks is the drivers door,Yes i am pressing it twice!.If i press the unlock button on the inside of the drvers door everything unlocks,Its just come back from a service and the bloke tells me the battery went flat because the ignition was left on!!would this effect owt???
if you can help that would be sound ash