Isuzu D-MAX 2020 Owner's And Driver's Manual page 491

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CONTROLS AND INSTRUMENTS
Buzzer
When the sensors detect an obstacle, the buzzer sounds at one of 4 levels, depending
on the distance between the vehicle and the obstacle.
As the distance between the vehicle and the obstacle decreases, the interval between
beeps gradually becomes shorter until the beeping becomes continuous when the
obstacle is too close.
When multiple sensors simultaneously detect obstacles, a buzzer corresponding to the
distance between the closest obstacle and the vehicle sounds.
NOTE
• When the outer sensors detect an obstacle, the buzzer sounds at one of 3
levels.