Hi Rationalrevolution:

___The ability to silence the reverse beep is in your 04 Prius’ Owners Manual. I don’t own a Prius to tell you exactly where but it is a common question and easily fixed by the owner. Someone has posted the Reverse beep disable instructions over at Priusonline a number of times if you cannot find it directly.

___Good Luck

___Wayne R. Gerdes
___Hunt Club Farms Landscaping Ltd.
___Waynegerdes@earthlink.net