Note that it only works for the North American Prius. You may have to try a few times to get the procedure right (see the different links for some slightly different user suggestions to make it work.)
If you have a UK/European/Australian Prius, the wire to cut to stop the reverse beep was (maybe) identified, but no one has been brave enough to try cutting it...
A forum community dedicated to Toyota Prius Hybrid owners and enthusiasts. Come join the discussion about performance, batteries, troubleshooting, economy, maintenance, and more!