2000 SAAB 9-5 car alarm

You need to replace the siren unit located under the d/s front wheel well liner, bolted beside the washer reservior, if u can't afford one right now u can disconnect it , this unit has it's own 10 year life span battery installed, at times the battery die's before 10years, & the unit starts shorting out, & going off at anytime, even while drive sometimes. Good luck, disconnecting the main vehicle battery will not help.