2008 Toyota Sienna Owners Manual - Page 431

08 SIENNA_U (L/O 0801) In the following cases, the buzzer will sound several times and the indicator will stay on to indicate that the system is not working properly. Rear sensors This system is designed to inform you of the approximate distance between your vehicle and an obstacle by indicator and buzzer. Rear sensors Distance shown as A in mm (in.) Approximately 1800-900 (70.9-35.4) Approximately 900-550 (35.4-21.7) Indicator and buzzer Intermittent Fast intermittent Continuous D When the temperature is extremely low. D When any of the sensors are malfunction. If the indicator is continuously on, have your Toyota dealer check the system. If the indicator remains blinking but you do not hear the buzzer sound, clean the sensors with soft cloth. Rear corner sensors Approximately 550 (21.7) or less Rear corner sensors Distance shown as B in mm (in.) Approximately 850-520 (33.5-20.5) Approximately 520-250 (20.5-9.8) Approximately 250 (9.8) or less Indicator and buzzer Intermittent Fast intermittent Continuous 390 2008 SIENNA from Aug. '08 Prod. (OM45455U)