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It could very well be that the alarm is not arming because of a failed sensor. How you'd go about checking is beyond my knowledge I'm afraid though.
Hopefully someone else may be able to offer further advice
Currently in scatz's garage:
2004 Subaru Legacy GT Spec B, a 2013 2.0 TDCi Titanium X Sport S-Max and a 2001 Honda NSR125R