RAM 3500 2018, Owner'S Manual, Page: 401 / 700

The system will indicate a detected obstacle by showing a
single arc in the left and/or right rear regions based on the
object’s distance and location relative to the vehicle.
If an object is detected in the left and/or right rear region,
the display will show a single solid arc in the left and/or
right rear region and the system will produce a tone. As the
vehicle moves closer to the object, the display will show the
single arc moving closer to the vehicle and the tone will
change from a single 1/2 second tone to slow, to fast, to
continuous.
Single 1/2 Second Tone
Slow Tone
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