see the complete how to at:Some Mazda3's are equiped with a factory alarm system. While this system is adequate and reliable for general use, it lacks any reaction from window breakage, impacts, etc. that is found in many basic aftermarket security systems.
This fact is also true on other late model Mazdas such as the RX-8, Mazda6, CX-7, and CX-9. Unfortunately, Mazda only released an accessory shock sensor upgrade for the RX-8 model only and neglected the other vehicles of this much needed system.
This how-to will show you how to adapt the (inexpensive) RX-8 shock sensor upgrade kit to a Mazda3. This how-to is intended for North American models only as other regions differ in electrical systems and parts availability.
http://web2.airmail.net/theman/mz3shock/
this how-to is in no way related or copied in anyway from the one on the *other* board... it was written almost a year ago but wasn't released (per mazda directives) until now due to the fact that the "cat's out of the bag" with the how-to on the other board posted over a month ago... as stated in the how-to, use and installation of the parts stated in this how-to is at your own risk and is not endorsed or warrantied by mazda