Alarm change on my 02 4Runner

[Retrowax]

I have a 02 4Runner SR5 2wd that recently had the battery replaced. Ever since then when I turn the car off the alarm activates in 30-35 seconds, it never did that before. How do I get it back to how it was before? Was the alarm deactivated? All I know is it's driving me crazy, I get out of me car, leave the doors unlocked and go back in a minute and the alarm goes off. I think the dealer set something when I bought it, but that was 8 years ago