Hi all, my T6 camper alarm went off last night, (No flashing lights) the remote key fob would not open the van to stop it. So had to open door with manual key. This worked so put key in ignition and every thing is dead. Does the alarm go off with a flat battery? Battery is 7 months old, or does immobiliser just shut everything down, not used camper for 4 weeks so if battery not sure why it would drain. Bit of a quandary as to the problem and what to do? Any advice gratefully received.