i have the standard subaru alarm the sigma, why is it going off for no reason? it went off last night and twice yesterday morning and one had or having the same problem?
i am going to have the battery tested in the morning, any advice would be brilliant

 

like to know what you find, my car does the same. Stop lock it give it a while then there it goes open close lock go back to bed then it's pot luck weather it stays ok!!!

 

The official Subaru line on the factory classic alarms is: Check for moving objects in teh vehicle i.e air fresheners etc. Check the air vents are closed.
I got this on the alarm card with my classic from 1999!
It worth having a look at the power supply to, Check the battery terminal are connected ok.

 

if you need any replacement parts (brain, siren) pm me and i may be able to help you as i had a clifford installed 3 weeks ago so removed the old one. got told to keep the parts if i changed the car but i probably would not bother as i see it as an upgrade, so should be able to pass on the deficit in the asking price imo