Jeep 2014 Grand Cherokee SRT - Owner Manual - Manual (Page 234)

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
Slow Tone
232 UNDERSTANDING THE FEATURES OF YOUR VEHICLE