Hi Kate, fuse #19 (main fusebox) is the supply for the alarm but it is also the fuse for the radio memory and the engine managment, so there is no dedicated fuse for the alarm, the alarm unit is mounted behind the drivers side kick panel, if you cut (and insulate the wire) that goes to pin 15 of the alarm unit it will stop the alarm or you could disconnect the alarm horn in the boot right hand side trim
nigel, August 2009