i know you say it doesn't sound like the buzzer when your door is open but just for the hell of it,check your door pins,they operate on contacting a chassis ground,also check your trunk pin there is one back there.i will have to check out my XR2 to see where there is a buzzer box other than the door alarm.make sure it's not your hazard or blinker flasher gone bad and making a noise sometimes those thinks make crazy sounds.