Hyundai sonata Owner's Manual page 226

Convenient Features
Types of warning sound and indicator
Types of warning sound
When an object is 24 in to 48 in (60 cm to 120 cm) from the rear
bumper : Buzzer beeps intermittently.
When an object is 12 in to 24 in (30 cm to 60 cm) from the rear
bumper : Buzzer beeps more frequently.
When an object is within 12 in (30 cm) of the rear bumper :
Buzzer beeps continuously.
NOTICE
• The indicator may differ from the illustration depending on objects or sensors
status. If the indicator blinks, have the vehicle inspected by an authorized
HYUNDAI dealer.
• If the audible warning does not sound or if the buzzer sounds intermittently when
shifting into R (Reverse) position, this may indicate a malfunction with Reverse
Parking Distance Warning system. If this occurs, have the vehicle inspected by an
authorized HYUNDAI dealer.
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Indicator