Dodge 2010 Grand Caravan Owner's Manual page 175

174 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
The system will indicate a detected obstacle by showing
three solid arcs and will produce a ⁄ second tone. As the
1
2
vehicle moves closer to the object the EVIC display will
show fewer arcs and the sound tone will change from
slow, to fast, to continuous.
Slow Tone