Dodge 2016 Grand Caravan Owner's Manual page 247

The vehicle is close to the obstacle when the EVIC display
shows one flashing arc and sounds a continuous tone.
The following chart shows the warning alert operation
when the system is detecting an obstacle:
Rear Distance Greater than
(inches/cm) 79 inches
(200 cm)
Audible Alert
Chime
Arcs
Radio Volume
Reduced
NOTE: ParkSense will reduce the radio volume, if on,
when the system is sounding an audio tone.
WARNING ALERTS
79-39 inches
(200-100 cm)
None Single 1/2
Second Tone
None 3 Solid
(Continuous)
No Yes
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 245
39-25 inches 25-12 inches
(100-65 cm) (65-30 cm)
Slow Fast
3 Slow 2 Slow
Flashing Flashing
Yes Yes
3
Less than
12 inches
(30 cm)
Continuous
1 Slow
Flashing
Yes