GMC 2012 Terrain Owner's Manual page 260

9-50 Driving and Operating
To change the volume of the
warning chime, see Chime Volume
under Vehicle Personalization on
page 5 33 for more information.
When the System Does Not
Seem To Work Properly
If the LDW symbol does not appear:
The lane markings on the road
may not be seen.
The camera sensor may be
blocked by dirt, snow or ice.
The windshield may be
damaged.
The weather may be limiting
visibility.
This is normal operation; the vehicle
does not need service. Clean the
windshield.
WARNING
If the LDW camera sensor is
blocked by dirt, snow, or ice, or if
the windshield is damaged, it may
not detect a vehicle ahead. LDW
may not help avoid a collision
under these conditions. Do not
rely on LDW 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 LDW
system may not detect lanes
ahead. LDW may not help avoid a
collision under these conditions.
Keep the headlamps clean and
properly aimed.
I n f o r ma t i o n P r o v i d e d b y :
LDW warnings may occasionally
occur due to tar marks, shadows,
cracks in the road, or other road
imperfections. This is normal system
operation, the vehicle does not need
service.
LDW Messages
FRONT CAMERA BLOCKED,
CLEAN WINDSHIELD: This
message may appear because the
front camera is blocked and cannot
operate properly. It may also
activate during heavy rain or due to
road spray.
LANE DEPARTURE SYSTEM
UNAVAILABLE: This message
may appear if LDW does not
activate due to a temporary
condition.
SERVICE FRONT CAMERA: This
message may appear to indicate
that LDW is not working properly.
If this message remains on after
continued driving, the system needs
service. Take the vehicle to your
dealer.