Jeep 2011 WK2 Grand Cherokee Owner's Manual page 70

BSM warning light remaining illuminated
the entire time the vehicle is in a forward
gear.
The area on the rear fascia where the radar
sensors are located must remain free of snow,
ice, and dirt/road contamination so that the
BSM system can function properly. Do not
block the area of the rear fascia where the radar
sensors are located with foreign objects (bum-
per stickers, bicycle racks, etc.).
Sensor Location (Driver Side Shown)
The BSM system notifies the driver of objects in
the detection zones by illuminating the BSM
warning light located in the outside mirrors.
68
Warning Light Location
The BSM system can also be configured to
sound an audible (chime) alert and reduce the
radio volume to notify the driver of objects that
have entered the detection zones. Refer to
"Modes Of Operation" for further information.
The BSM system monitors the detection zone
from three different entry points (side, rear,
front) while driving to see if an alert is neces-
sary. 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
Entering From The Rear
Vehicles that come up from behind your vehicle
on either side and enter the rear detection zone
with a relative speed of less than 30 mph
(48 km/h).