Cadillac 2007 STS Owner's Manual page 186

Make sure the Head-Up Display is on and
properly adjusted. If the HUD is not on, FCA will
not be enabled and you will not be provided
with FCA audible and visual warnings. See
Head-Up Display (HUD) on page 223 for more
information.
CAUTION:
{
•
On winding roads, FCA may not detect
a vehicle ahead. You could crash into
a vehicle ahead of you. Do not rely on
FCA on winding roads.
•
When weather limits visibility, such as
in fog, rain, or snow, FCA performance
is limited. There may not be enough
warning distance to the vehicle in front
of you. Do not rely on FCA in low
visibility conditions.
186
CAUTION:
{
When FCA is enabled, the Adaptive Cruise
Control switch is on. If you press another
Adaptive Cruise Control button, you might
go into cruise when you do not want to.
You could be startled and even lose
control. Be careful not to press adaptive
cruise buttons unless you want to use
cruise control.