GMC Sierra 2018 Owner's Manual page 288

Warning (Continued)
Detect lanes on winding or
hilly roads.
If LKA only detects lane markings
on one side of the road, it will
only assist or provide an LDW
alert when approaching the lane
on the side where it has detected
a lane marking. Even with LKA
and LDW, you must steer the
vehicle. Always keep your
attention on the road and
maintain proper vehicle position
within the lane, or vehicle
damage, injury, or death could
occur. Always keep the
windshield, headlamps, and
camera sensors clean and in
good repair. Do not use LKA in
bad weather conditions.
Warning
Using LKA while towing a trailer
or on slippery roads could cause
loss of control of the vehicle and
a crash. Turn the system off.
How the System Works
The LKA camera sensor is on the
windshield ahead of the rearview
mirror.
To turn LKA on and off, press
on the center stack.
A
When on, is green if LKA is
available to assist and provide LDW
alerts. It may assist by gently
turning the steering wheel and
A
display as amber if the vehicle
approaches a detected lane marking
without using a turn signal in that
direction. It may also provide an
A
LDW alert by flashing
as the lane marking is crossed.
Additionally, there may be three
beeps, or the driver seat may pulse
Driving and Operating
three times, on the right or left,
depending on the lane departure
direction.
Take Steering
The LKA system does not
continuously steer the vehicle.
If LKA does not detect active driver
steering, an alert, chime, or DIC
message may be provided. Move
the steering wheel to dismiss.
When the System Does Not
Seem to Work Properly
A
The system performance may be
affected by:
Close vehicles ahead.
Sudden lighting changes, such
as when driving through tunnels.
Banked roads.
Roads with poor lane markings,
such as two-lane roads.
If the LKA system is not functioning
amber
properly when lane markings are
clearly visible, cleaning the
windshield may help.
287