car seat alarm systems

Can a burglar disable a car alarm system?

I got into my car this morning and noticed all of my belongings thrown around in the front seat, inside lights turned on, etc. After I got out of my car, I pressed my button to lock the door and set the alarm, but the alarm didnt go. FYI: Like most cars, the horn usually honks and a light comes on when the alarm is active. Neither happens when I press the button now.
*I Drive a Nissan Altima 2002
Thanks for any help.

either you forgot to turn off the lights in the cabin
or your alarm stopped working.
i had a custom alarm installed on my highlander and it stopped functioning right after the warranty expires (funny huh?)
i had to get a new alarm. check if yours is working. roll down the window, close and lock the doors and try to open the door from the inside. if the alarm doesnt go off, then its probably a alarm problem.
also, you couldve ignored/couldnt hear it. it turns off by itself after a period of time.

‘Active’ safety systems reduce ‘BANG’ to ‘bump’
BMW has trashed a couple of new 530d’s to assess the effect of “active” safety systems on current EuroNCAP crash testing. Some things just have to change…