I have a 2001 RX 300 and it works for me as well.
Press the menu button, then choose system option. Then press the top left of the screen, then the bottom left of the screen, then the top left again, then the bottom left again, then finally touch the bottom right of the screen. It will bring up a system menu. Choose the override button, then hit back. If you do this while moving, you won't be able to edit until you stop the first time. If you are stopped when you do this, then you can continue to edit while moving. Now if someone can figure out how to permanently fix this, that would be great.