My van every 3-4days horn goes off for 30seconds then beeps every 2mins, the battery light flashes and when I put the keys in the ignition it says "eco mode". The only way to stop the battery from draining it to disconnect the battery then re-connect it. Then it does it the process again 3-4days later. It's had a new battery and all equipment is switched off. I've done a battery drain test but only after re-connecting the battery. Citroen have taken the horn fuse out and no codes shown up on lexia (is that because I've bsi reset it?). Any suggestions are much appreciated before I pay for a new Bsi, comms2000, ecu etc.