How do you reset security system 1999 sienna?

To reset the security system on a 1999 Toyota Sienna, begin by ensuring that the vehicle is turned off. Insert the key into the ignition and turn it to the "On" position (not starting the engine) for about 10 seconds, then turn it back to "Off." Repeat this process three times, and then start the engine. If the security light blinks and then goes out, the system should be reset.