1998 Toyota Avalon Programming my key

Be sure the SECURITY light is flashing. Put a key in the igntion. The light should now STAY ON. Once the KEY registration is underway, the light should go off. When the registration is complete, the light should come back on. Remove the key. If the registration was complete, and the system is operating normally, when the key was removed, the light should start flashing. If it was NOT complete, when the key was removed, the code 2-1 will be displayed by the security light. And when inserting the already registered key, the code 2-2 will be displayed by the light. If you're doing more than one key, repeat the step above. If not, the registration is complete. To complete the automatic registration mode, press and release the BRAKE pedal 5 times within 15 seconds or you can do it with a scan tool. Hope this helps.