Jeep 2014 Grand Cherokee SRT - Owner Manual - Manual (Page 225)

If an obstacle 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 obstacle, 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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UNDERSTANDING THE FEATURES OF YOUR VEHICLE 223