Toyota 4RUNNER 2010 Quick Reference Manual page 238

2-4. Using other driving systems
The indicator and buzzer
When a sensor detects an obstacle, the direction of the obstacle is
indicated and the buzzer sounds.
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Sensor operation and distance to an obstacle
The system operates when the vehicle approaches an obstacle, as
shown by the following table.
Rear corner sensors
Distance to an obstacle ft. (cm)
Approximately 1.6 - 1.2 (50 - 37.5)
Approximately 1.2 - 0.8 (37.5 - 25)
Approximately 0.8 or less (25 or less)
Rear center sensors
Distance to an obstacle ft. (cm)
Approximately 4.9 - 2.0 (150 - 60)
Approximately 2.0 - 1.5 (60 - 45)
Approximately 1.5 - 1.2 (45 - 35)
Approximately 1.2 or less (35 or less)
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I n f o r ma t i o n P r o v i d e d b y :
Indicator and buzzer
Intermittent
Fast intermittent
Continuously
Indicator and buzzer
Intermittent
Fast intermittent
Very fast intermittent
Continuously