Most likely there was either an actual theft attempt, or you (or someone with your keys) not realizing that you/they actually armed the vehicle and opened the door or trunk afterwards.
Essentially this sounds like the vehicle was entered after being armed and the proper precedures not met to reset it.
The car may just need to be locked from the outside with the key (not the remote or keyless entry) while the doors are closed and windows are up, and then also unlocked with the key...
You may first want to disconnect the battery fpr 5 or 10 minutes. During this time, I would suggest checking all your fuses and replace the ones affected by the anti theft system.
Security - Pwr Locks - Horn - Pwr Trunk Release _ Int Lights - and maybe The Emergency Flasher as well.
Be sure and check under the Dash, Hood and any fuse blocks you know exisiting in your vehicle
Some manufacturers recommend that after a theft attempt, the vehicle may need to be serviced. I know it is this way with Cadillac, but I also know they pretty much run through the scenario I just descrobed for you. So I recommend going through the fuses first, even replacing the battery in your remote (key fob) and then if the problems still persist. have the vehicle serviced.
Good Luck and Happy Motoring
Respectfully
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