sounds like your siren is messed up or a prob with the wiring. Find your siren under the hood, and check to see if they grounded the black wire at the siren. If they did, maybe take that ground off and re-do it. Whenever I install an alarm, i run the ground for the siren right at the ground for the brain. DEI recomends this too. If your grounds are ok, then suspect a faulty siren. Sounds like everything else is working properly. Its not too uncommon for a bad siren; i have seen several...esp if the siren is mounted so that the open part of it is pointed upward, as this can collect water and moisture, which can ruin the siren over time.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)