It's kind of cool to have a car with cheat codes
although it was disappointing when I finally tried to use them and I couldn't get the seatbelt beep suppression to work. (I always wear my seatbelt but I'd like to be able to start the car then put on the seatbelt without the obnoxious beeping. I've also had the Prius decide that there was passenger when there wasn't and complain about their seatbelt too.)
It looks like it may have just been a lack of detail
in the original instructions.