Toyota 4runner 2010 Instruction Manual page 212

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
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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Indicator and buzzer
Intermittent
Fast intermittent
Continuously
Indicator and buzzer
Intermittent
Fast intermittent
Very fast intermittent
Continuously