Jeep Grand Cherokee 2012 Owner's Manual page 224

222 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
FCW settings can only be changed when the vehicle is in
PARK.
The default status of FCW is the "Far" setting, this allows
the system to warn you of a possible collision with the
vehicle in front of you when you are farther away. This
gives you the most reaction time.
Example Only
Changing the FCW status to the "Near" setting, allows
the system to warn you of a possible collision with the
vehicle in front of you when you are much closer. This
setting provides less reaction time than the "Far" setting,
which allows for a more dynamic driving experience.
Example Only