Disconnect battery, find alarm and trace each wire back to main loom, where it meets loom disconnect/cut and repatch main loom wires (bridge the gaps where the alarm wires were) and loom/bike should be back to original status. Or check alarm internal battery is sound and no water ingress as had this problem on my impreza with played havoc with the alarms ECU. Am in Swindon if you still need someone to take a (amatuer) eye over the setup