RAM 1500 Owner's Manual page 228

226 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
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.
Park Assist System Off