Quick search turned up this.....
http://www.msprotege.com/forum/showthread.php?t=85005
Well how bout this one? I just got my 6 2 weeks ago. Didnt get a key fob with it. The alarm went off on me one night when I popped the trunk, locked the doors, then opened the trunk. I had to put my key in the door and unlock i tto shut it off. I was unaware I even had an alarm on the car until then. Is it a true alarm, or is it just something else. I suppose if a door was opened while it was locked it'd go off.
After that I took it to Carmax where I bought it, and they got me 1 new key fob for the car. They only supplied one, however I have 3 keys, and would like at least 1 more key fob. They wanted something stupid like $170 for another one, so any idea, on how I can get another one cheaper? Or am I just going to have to suck it up?
The car should have two key fobs, and a valet key. They do cost a bit for the smart keys, but you can check with some of the online dealers directly (they sell at discounts). I prefer Arlington Mazda personally, but there are plenty out there.
If you popped the trunk, set the alarm, then opened it I would expect the alarm to go off. The same goes if you use the key fob to lock the car and a passenger (someone in the car) opens the door from the inside. This is pretty normal behavior for standard alarms.
There is also a shock-sensor upgrade for the car which will alert you if the car is "impacted" by something. Should be a little box zip tied to one of the wiring harnesses next to the foot well. There is a dial to adjust sensativity.
Alarm will auto arm when you lock the doors either with the fob or the key....Check Ebay as well they usually have the keyfobs for cheap...