Dodge Charger 2011 Owner's Manual page 231

UNDERSTANDING THE FEATURES OF YOUR VEHICLE 229
3
Rear Park Assist Disabled Slow Tone
The system will indicate a detected obstacle by showing
three solid arcs and will produce a one-half second tone.
As the 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.