Dodge 2009 Caravan Owner's Manual page 109

UNDERSTANDING THE FEATURES OF YOUR VEHICLE 107
The BSM system can also be configured to sound an
audible (chime) alert and mute the radio to notify the
driver of objects that have entered the detection zones.
Refer to "Modes Of Operation" in this section.
The BSM system monitors the detection zone from three
3
different entry points (Side, Rear, Front) while driving to
see if an alert is necessary. The BSM system will issue an
alert during these types of zone entries.
Entering From The Side
Vehicles that move into your adjacent lanes from either
side of the vehicle.
Side Monitoring