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One of the most annoying features of the generation 3, 2010 Prius is the beeping noise you hear while backing up. As soon as you move the shift lever into R Upload try #3 -- using my Scangauge II to control the reverse beeper on a 2010 Prius . See http://priuschat.com/forums/gen-iii-2 for more info and the codes. This combination Back-Up Beeper and Halogen Bulb warns people behind the vehicle that you are backing out. Simply replace one of your vehicle's existing 3156 style.