download the manual (it may assist if you don't have a copy) http://www.texe.com/downloads.php?page=33. Enter the engineer mode and remove the pir cover.
factory set codes are,
user code 4321
engineer code 1234
The alarm will activate, enter your own code the alarm will stop. reposition pir and connect exactly the same, label when taking apart if required. Once installed whilst in engineer mode enter 06 this is a walk test which means as you walk around your home you can see if the pirs work. Your newly positioned pir will retain the same zone location as you have not altered this within the control panel. On the walk test that zone, for eg 4 when activated(lit led within pir) the control panel will bleep 4 times indicating zone 4 is ok and so on for all the zones. when complete come out of engineer mode back into standard mode.
marco, October 2007