Car Alarms: 93 mustang GT false alarm, siren sounds, gm trucks

Question
Hi...This alarm system came with the car....it has a valet button/red led on left dash and override button below steering column. FOB has arm/disarm buttons only. It is being set off (siren sounds and doors unlocked)by 2000 era GM trucks and most new Chrysler vehicles. Is there a way to disconnect it or at least mute the siren? Any help appreciated....it is driving me crazy.

Answer
Try this:

KEY IN AND IN THE ON POSITION JUST BEFORE CRANKING,
PRESS AND HOLD IN VALET SWITCH/BUTTON UNTIL YOU
GET A CHIRP FROM THE SIREN, AND MAYBE A FLASH OF THE LIGHTS.
KEY OFF.

This procedure would let you toggle into and out of
override on most alarms.

Then I suggest extracting it and repair.

Let me know if it does with yours too.

ALARMTEK
caralarmman.com