Phade2

Today my car horn started to beep everytime I switched the key to the on position.
They were 3 quick short beeps, does this mean my alarm was tripped?
I looked in the manual and searched on this site for any reference, but found nothing. My car has the stock alarm and the dealer added shock-sensor alarm upgrade. (not the mazda shock-sensor but an aftermarket one..uses the stock key fob).
Does anyone know how to reset or turn this thing off? I tried opening the trunk or door with the key, holding down the unlock button for more than 3 seconds, turning on/off the valet switch, checked all the doors if any were open....nada...still beeps 3 times when the key is switched to on.
If anyone has any other ideas I'd appriciate it....
anyone?...anyone? ....bueler?....bueler???