problem with doing a piezo siren and a glass break sensor is the the frequency the piezo plays is the same that sets off the glass break sensor. So a warn-away chirp will trigger the instant trigger glass break sensor. Also a bypass notification will trigger the glass break sensor.
The easiest way to fix this is to disable door bypass notification, and wire a relay so that the piezo will only sound if the door is open (use door trigger). Reason being is that the piezo is only good when the thief is in your car and with the relay it wont trigger the glass break on a shock sensor warn away.
Featured 1995 Jaguar Vanden Plas - frugal beats build questions
Featured Question for those that have sound deadened car doors to improve mid range woofer sound:
