on my 02 wrx ,
i found A TRIM POT on the alarm module
mine was set to max, i backed it off to 1/2 way seems to have cured my problem of the alarm going off by itself, (usually at like 3am LOL!) the pot is hidden under black tape on the top of the box under the armrest @ e brake
i figured i'd try adjusting it before pulling the plug
hope it helps anyone with similar troulbles
bgood everyone!