On 01/10/05 23:46 ET, pilgram said...
The motion sensor is most likely your problem.
They are commonly called PIR's (passive infrared)
and shoot IR rays out that must be crossed to
trigger the alarm.
The pattern is adjustable, but may compromise
the security coverage in that room.
Your diagnosis is correct, but the passive ones don't shoot out IR. They are passive and sense when IR crosses the sensitivity paths of their sensors. IR as given off by body heat. Or remote controls perhaps; can a remote control trigger such an alarm?