Buzzer on alarm system

[henniesharky]

Want to connect a alarm / siren to my 2002 pajero 3.2 did , so if one lock or open the door the alarm / siren will beep , the thinking is to connect it at the same point as where the current alarm system connect to the turning lights (as they do flash every time one lock or unlock the door )the reason for this is that the vehicle did unlock a number of times when/ i put the key in my pocket , where can one connect into the wiring and what color would the wire be ?
thank you