If an obstacle is behind the vehicle when REVERSE gear is engaged, an audible alert is activated.
The tones emitted by the loudspeaker inform the driver that the vehicle is approaching an obstacle. The pauses between the tones are directly proportional to the distance from the obstacle. Pulses emitted in quick succession indicate the presence of a very close obstacle. A continuous tone indicates that the obstacle is less than 12 in (30 cm) away.
Audible And Visual Signals Supplied By The Rear Park Assist System.

While audible signals are emitted, the audio system is not muted.
The audible signal is cut out immediately if the distance increases. The tone cycle remains constant if the distance measured by the inner sensors is constant. If this condition occurs for the external sensors, the signal is cut off after 3 seconds (stopping warnings during maneuvers parallel to walls).
See also:
Exhaust System
The best protection against carbon monoxide entry into the vehicle body is a
properly maintained engine exhaust system.
If you notice a change in the sound of the exhaust system; or if the exhaust ...
Supplemental Seat-Mounted Side Air Bags (SAB)
Supplemental Seat-Mounted Side Air Bags (SAB) provide enhanced protection to
help protect an occupant during a side impact. The SAB are marked with an air bag
label sewn into the outboard side of ...
9. Air Bag Warning Light
This light will turn on for four seconds as a bulb check when the ignition switch
is first turned to ON/RUN. If the light is either not on during starting, stays
on, or turns on while driving, h ...


