here goes...

when you disarm the alarm, but DONT turn the ignition on (ignition cancells the sens and tell) the LED will flash a number of times in a morse code type sequence as follows:

flash pause, flash pause etc = volt drop (interior light, mobile phone charger, radar detector etc)

flash flash pause, flash flash pause = interior detection(ultrasonics) ie open window, sunroof, open air vent and gust of wind.

flash flash flash pause, flash flash flash pause = earth contact, ie door swicth, boot or bonnet switch.

4 flashes and pasue repeated (u get the idea....) = shock sensor

5 flashes and pause repeated = ingition energisation - ie someone trying to hotwire it.

6 flashes and pause repaeted = disconnection of main car battery or supply to the alarm.

hope this helps,

cheers, dave.