Hi everyone, I recently bought a Mazda3 Sport Skyactiv 5-door, about a month ago. The previous owner was the first owner and took really good care of the car, so overall it’s in great condition. But I’m having one really annoying issue: the security alarm keeps going off randomly, even when the car is locked and there’s no visible reason, and it’s embarrassing because it disturbs the neighborhood. For now, as a temporary fix, I’ve been pulling out the horn fuse at night just to stop the alarm sound, but obviously this isn’t a long-term solution. Has anyone dealt with this problem before?What should I check first?Is there anything I can do to fix it without spending a lot? Any advice, common causes, or DIY checks would be really appreciated.
Thanks in advance!

 

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Because you just purchased a used Mazda .....
Before any electrical issue can be diagnosed you should first verify the battery condition by way of a properly done battery Load test.