maybe it's one of the other sensors, like the tilt or interior sensor going bad?
maybe it's one of the other sensors, like the tilt or interior sensor going bad?
Another thing that could affect the alarm are the windows. I've noticed with mine that if I open the door, disconnect the battery, and close it, the window goes lower and lower as it thinks it needs to clear the seal even if it's already cleared. Far fetched but maybe try opening and closing your windows and sunroof?
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Small update:
I contacted that GM5 guy with the symptoms and he replied that it's not the GM5 module.
I changed the tilt sensor in the trunk with another one I had, no change. Siren still goes off after 5 seconds of locking the car with the key.
I unplugged the interior sensor and the siren doesn't goes off anymore. Behavior seems to be as it should, albeit without the interior sensor.
Seems like a new interior sensor might be needed.
Thanks to everyone for the ideas, I'll report back after I have some time to mess with it again.
Hopefully that's it. You could borrow my interior sensor to test, if you want, before you buy another one. It's not like my car moves lol