My original toyota camry 2.4 year 2002 alarm will goes off with the sound of "tick, tick, tick..." after i pressed the alarm button. Happen after I change the battery I read the manual and it say press on and off the button for 15 times and the system reset itself. I tried but it doesn't work Pls help

SOURCE: DRIVE BELT ON 2002 TOYOTA CAMRY

If you are referring to the vehicle having a "Timing Belt", no, it does not have one.
The 2002 Camry 4 cylinder has a Timing CHAIN, and does not need to be replaced.

SOURCE: FACTORY ALARM CAMRY TOYOTA 2002 WENT OFF WHEN i WAS DRIVING

If your remote is attached to the key in the ignition, it could have been bumped setting off the alarm. It is also possible for the lock button to be depressed and lock the doors, if you do not notice this and get out of the car........!

SOURCE: 2002 camry battery changed, dies in idle

Check the manufacture's Cold Cranking Amps (CCA) rating.  Some manufacturers recommend a minimum CCA.  If your CCA is below the manufacturer's specs, it can cause your car to run erratically.  This also can cause problems with your computer and give you faulty DTC's. (Diagnostic Trouble Codes - Service Engine Soon Light)  This especially causes problems with General Motors cars.  I'm always hearing of people with these problems.  Let me know how it works.

SOURCE: 2006 toyota solara, alarm keeps going off

Those cars have a frequency sensor that is attuned to the exact sound frequency of breaking glass. Are there any noises nearby that resemble glass shattering? Wind chimes? Any type of extraneous noise at the freq of glass breakage will set off the alarm.

SOURCE: 2002 Toyota camry factory alarm

get a used one.it can be reprogrammed with the obd2 system for 100 bucks.