If you use the search feature, you will discover detailed instructions on how to disable the beep. Search for the word "beep"
Disabling the Reverse beep Turn your car either on or to “IG-ON†mode (IG-ON is pressing the power button twice while your foot isn’t on the brake) Next cycle through the ODO button (if your car is already displaying ODO you just have to hit it 3 times TripA,TripB,ODO) Turn off the car Now while applying pressure to the brake hit the power button (aka start your car) Within 6 seconds after starting push and hold ODO button for 15 seconds After 15 seconds have passed while still holding the ODO button shift from P to R, then back to P. Let go of ODO button On trip display you’ll see either “b-on†or “b-off†we want b-off. Press the ODO button until you see the display reading “b-off†Power off the car Congrats, you’ve successfully disabled the “dump-truck†beep from your toyota prius! Note** If you disconnect your 12v battery anytime after doing this procedure the car may reset itself and turn the reverse beep back on. Simply go through the steps again. Disable the Seatbelt Beep If you’ve ever put anything heavy in the passenger seat you’ll know what I mean by “annoying seatbelt beepâ€. The procedure to disable the seatbelt beep is the same as the reverse beep except for one step. When you get to the step where you would start the shifting process substitute that with the buckling/unbuckling of the appropriate seat. Also, you must have someone or yourself seated in the passenger seat while disabling the passenger seat. Following these simple steps should result in successfully disabling
