Jeep 2013 Grand Cherokee - Manual (Page 244)

FCW monitors the information from the forward looking
sensor as well as the Electronic Brake Controller (EBC),
wheel speed sensors, i.e., to calculate a probable rear-end
collision. When the system determines that a rear-end
collision is probable a warning message (both audible
and visual) will be displayed on the EVIC. When the
system determines a collision with the vehicle in front of
you is no longer probable, the warning message will be
deactivated.
NOTE:
• The minimum speed for FCW activation is 10 mph
(16 km/h).
• When entering or driving in a curve, the FCW alerts
may be triggered on objects other than vehicles such as
FCW Message
242 UNDERSTANDING THE FEATURES OF YOUR VEHICLE