Citroen Pluriel C3, after a frosty night the boot lid won't open, the back window demister won't switch on and the roof wont open. A beeping sound occurs when trying to open the roof. I have checked for a fuse but there isn't a common fuse for all three. I have read other suggestions about trying to close the roof to actuate the roof sensor. I have tried using the roof control but nothing happens. I have also tried resetting the cpu by disconnecting the battery and reconnecting but this also did nothing. any other ideas?

Christian, November 2012