The distance to the barrier on the steamer of the Chevy Captiva is determined by the sound signal. There are four levels of signals:
1) 1st signal. It is separated at a distance of between 90 and 150 cm. That sounds like -- [ beep] [ beep] [ beep]
2) 2nd signal. It is separated at a distance of about 60 to 90 centimeters. That sounds like------------------------
3) 3rd signal. It is separated at a distance of about 30 to 60 cm. That sounds like -- bip bip bip-poop.
(4) 4th signal. It is separated at a distance of about 20-30 cm. Continuous beeping.