Jeep Grand Cherokee 2014 Owner's Manual page 232

230 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 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