2004 Toyota Sienna Owners Manual - Page 334

04 SIENNA_U (L/O 0408) 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 sensors To turn on: Push the switch. The indicator comes on and the buzzer will sound. To turn off: Push the switch again. 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 corner sensors D When the temperature is extremely low. D When any of the sensors are malfunction. 334 2004 SIENNA from Aug. '04 Prod. (OM45422U)