Jeep Grand Cherokee SRT8 2012 Owner's Manual page 151

UNDERSTANDING THE FEATURES OF YOUR VEHICLE 149
The BSM system monitors the detection zone from three
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
3
Vehicles that move into your adjacent lanes from either
side of the vehicle.
Side Monitoring