I've got the same issue, took the car out of winter storage, installed a new battery, loaded the eurotune, sprintbooster. Locked the doors and several hours later the alarm goes off. The xfire is a 2004 n/a model. Cleaned the battery terminals on the battery, checked for moisture in the trunk, non there. Is there a way to totally disable the alarm, or a way to use a meter in the siren. I know I can pull fuse 9, but that does affect the remote entry. I would like to keep the remote entry and not have my lights or siren go nuts. First option to fix it is buy a new siren, but for now is there a way to lock the doors and hatch without setting off the alarm. Read all i could find on here and the mercedes forums....