Not sure on the details but the switch is in the boot lock, when it's open light comes on, when it's closed, light switches off :)
isee 2wires to boot latch,,, the latch works off remote fine,,, so unsure how it works,, or what feed ishould have there
have check fuse seem ok,,, so stuck,, any 1 got wiring diagram
have you tried here:
http://www.bahamutcars.com/workshop/IS_98-05/