How do turn off a factory alarm Toyota Avalon 1997?

To turn off the factory alarm on a 1997 Toyota Avalon, insert the key into the driver's side door and turn it to the unlock position. This should disable the alarm system. If the alarm continues to sound, you can also try starting the engine with the key, as this may reset the alarm. If the issue persists, consult the owner's manual for further instructions or consider contacting a professional.