GM Owner Manuals - Buick

How the System Works
LDW uses a camera located between the inside
rearview mirror and the windshield to detect the lane
markings.
@ (Lane Departure Warning): To turn LDW on and off,
press the LDW control, located by the exterior headlamp
control. An indicator on the control will light to indicate
that LDW is on.
LDW only operates at speeds of 35 mph (56 km) or
greater. If LDW is turned on when traveling at these
speeds, the LDW symbol will appear green if the system
detects a left or right lane marking. This symbol will
change to amber and flash and three beeps will sound
if you cross a detected lane marking without using
the turn signal.
If the LDW symbol does not appear, LDW is not
currently operating and will not warn you.
To change the volume of the warning chime, see Chime
Volume under DIC Vehicle Customization on page 4-66
for more information.
When the vehicle is started, the LDW symbol, located
in the instrument panel cluster, will briefly come on
to indicate that the light is operational.
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