Originally Posted by Rodderz
Me too, don't all car's alarms go off if you open the boot when the alarm is armed?
Nope! The alarm in the GT/GTP should not go off when you open the boot and the rest of the car is armed. It is supposed to be smart enough to detect you opening the boot (with the fob), and disarm that sector only - which mine does.
Conversely, if you arm the alarm (lock the doors using the fob) whilst the boot is open, the alarm should arm itself like normal, then emit several beeps about 5 seconds later to warn you that you have an open sector (the boot)!
There are several threads here on FF that describe alarm problems with the GT/GTP, and many of them seem to point to a poor earth behind the front passengers footwell kick-panel being the cause - dunno if this is the case with the problem described here.