You're welcome Chris. The sensors are behind the mesh above the switches on the interior light module above the rear view mirror.
To set the alarm off sit inside and arm the system, wait 45 seconds and then move your arms around. T:
Guys on the subject of security. Also make sure your house doors are double locked/dead bolted etc EVERY NIGHT even when your in the house as my van was taken last Thursday night, even though it was alarmed. They just broke into the house and took the keys from the living room (which is on the middle floor of a three story house so not exactly out on show)