If the alarm is a "factory" alarm, cycle the key in the ignition from off to on (where the dash indicators light up), 5 times. This is the reset procedure for the "factory" alarm. Otherwise look in the owners manual where there is a red button under the steering wheel, possibly behind a panel. These process is performed when doing maintenance. Either way, you want to make sure to re-engage it when you get it working or you will not have the alarm.

Factory panic alarm going off after changing battery [97 Toyota Camry]
Basically that. The way I am doing it now is with the TimerA set to 1 second interrupts. But I think that it's very annoying. Are there any other ways to do it?

I want to basically set timers on that clock, like, shutdown until 40 seconds have passed... 
