TOYOTA 2010 Sienna - Manual (Page 237)

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2-4. Using other driving systems
2
Wh
en drivin
g
■
Back sensor operation and distance to an obstacle
The system operates when the vehicle approaches within following
distance to an obstacle. The indicator flashes and the buzzer
sounds when the system is operating.
ft. (cm)
Distance to an obstacle Indicator and buzzer
Approximately 5.9 - 3.0 (180 - 90) Intermittent
Approximately 3.0 - 1.8 (90 - 55) Fast intermittent
Approximately 1.8 or less (55 or less) Continuously