TOYOTA 2011 4Runner - Manual (Page 238)

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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.
■ 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
Rear center sensors
Distance to an obstacle ft. (cm) Indicator and buzzer
Approximately 1.6 - 1.2 (50 - 37.5) Intermittent
Approximately 1.2 - 0.8 (37.5 - 25) Fast intermittent
Approximately 0.8 or less (25 or less) Continuously
Distance to an obstacle ft. (cm) Indicator and buzzer
Approximately 4.9 - 2.0 (150 - 60) Intermittent
Approximately 2.0 - 1.5 (60 - 45) Fast intermittent
Approximately 1.5 - 1.2 (45 - 35) Very fast intermittent
Approximately 1.2 or less (35 or less) Continuously