Toyota 2014 Sienna Manual page 321

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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
SIENNA_OM_OM45483U_(U)
2-4. Using other driving systems
Indicator and buzzer / Color
Slow intermittent / yellow
Intermittent / yellow
Fast intermittent / yellow
Continuous / red
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