Toyota SIENNA 2011 Quick Reference Manual page 342

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Back sensor operation and distance to an obstacle
The system operates when the vehicle approaches within the fol-
lowing distances to an obstacle. The indicator flashes and the
buzzer sounds when the system is operating.
Approximate distance to obstacle
5.9 to 2.8 ft. (180 to 85 cm)
2.8 to 1.5 ft. (85 to 45 cm)
1.5 to 1.1 ft. (45 to 35 cm)
1.1 ft. (35 cm) or less
Indicator and buzzer / Color
I n f o r ma t i o n P r o v i d e d b y :
2-4. Using other driving systems
Slow intermittent / yellow
Intermittent / yellow
Fast intermittent / yellow
Continuous / red
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