2011 Toyota Prius Owners Manual - Page 542
2011 Toyota Prius Manual
Page 542 highlights
5-2. Steps to take in an emergency Warning message Details (Flashes) Indicates a malfunction in the radar cruise control system. A buzzer also sounds. Press the "ON-OFF" button once to deactivate the system, and then press the button again to reactivate the system. (If equipped) 520 PRIUS_U (OM47685U) DVD