GMC 2012 Terrain Owner's Manual page 259

Selecting the Alert Timing
The Collision Alert control is on the
steering wheel. Press COLLISION
ALERT to set the alert timing to far,
medium, near or off. The first button
press shows the current control
setting on the DIC. Additional button
presses will change this setting.
The chosen setting will remain until
it is changed and will affect both the
Collision Alert and the Tailgating
Alert features. The timing of both
alerts will vary based on vehicle
speed. The faster the vehicle speed,
the further away the alert will occur.
Consider traffic and weather
conditions when selecting the alert
timing. The range of selectable alert
timing may not be appropriate for all
drivers and driving conditions.
Detecting the Vehicle Ahead
The green vehicle ahead indicator
will appear when a vehicle is
detected ahead. Whenever this
indicator does not appear, FCA
will not respond. The indicator
may disappear on curves, highway
exit ramps, or hills, or due to poor
visibility. The FCA system will not
detect another vehicle ahead until
it is completely in the driving lane.
Driving and Operating
WARNING
If the FCA camera sensor is
blocked by dirt, snow, or ice,
or if the windshield is damaged,
it may not detect a vehicle ahead.
FCA may not help avoid a
collision under these conditions.
Do not rely on FCA when the
camera is blocked by snow, ice,
or dirt. Keep the windshield clean.
WARNING
If the headlamps are not cleaned
or properly aimed, the FCA
system may not detect a vehicle
ahead. FCA may not help avoid a
collision under these conditions.
Keep the headlamps clean and
properly aimed.
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