Jeep 2011 Grand Cherokee - Owner Manual - Manual (Page 116)

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.). The BSM system notifies the driver of objects in the
detection zones by illuminating the BSM warning light
located in the outside mirrors.
Sensor Location (Driver Side Shown)
Warning Light Location
114 UNDERSTANDING THE FEATURES OF YOUR VEHICLE