Lexus LS500h, Manual, Page: 243 / 524

243
4-5. Using the driving support systems
LS500h_OM_(U)_1810
4
Driving
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. (

P.244)
• The dynamic radar cruise control with
full-speed range approach warning is not
operating.
• The lane departure alert function is not
operating.
■
Temporary cancellation of functions
●
When operation conditions are no longer
met, a function may be temporarily can-
celed. However, when the operation con-
ditions are met again, operation of the
function is automatically restored.
(

P.241)
●
If the operation conditions (

P.241) are
no longer met while the lane centering
function is operating, the steering wheel
may vibrate and the buzzer may sound to
indicate that the function has been tem-
porarily canceled. However, if the “Alert”
customization setting is set to
,
the system will notify the driver by vibrat-
ing the steering wheel instead of sound-
ing the buzzer.
● If the operating conditions (

P.241) are
no longer met, the lane change assist
function will be canceled. (vehicles with
Lexus Safety A)
If a message urging operation of the steer-
ing wheel is displayed, operate the steering
wheel.
■
Steering assist function/lane centering
function
●
Depending on the vehicle speed, lane
departure situation, road conditions, etc.,
the driver may not feel the function is
operating or the function may not oper-
ate at all.
●
The steering control of the function is
overrided by the driver’s steering wheel
operation.
●
When the vehicle speed is approximately
31 mph (50 km/h) or less, the warning
display of the lane centering function will
not operate.
●
Do not attempt to test the operation of
the steering assist function.
● The steering assist function may operate
when attempting to cut closely in front of
another vehicle while changing lanes.
■
Lane departure alert function
●
The warning buzzer may be difficult to
hear due to external noise, audio play-
back, etc. Also, it may be difficult to feel
steering wheel vibrations due to the road
conditions, etc.
●
If the edge of the course
*
is not clear or
straight, the lane departure alert function
may not operate.
●
It may not be possible for the system to
determine if there is a danger of a colli-
sion with a vehicle in an adjacent lane.
●
Do not attempt to test the operation of
the lane departure alert function.
●
This function may operate if, when chang-
ing lanes, your vehicle cuts closely in front
of another vehicle.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
■ Lane change assist function (vehicles
with Lexus Safety A)
Depending on the vehicle speed, vehicle
condition, road conditions, or conditions of
the area around the vehicle, the lane
change assist function may not operate or it
may be difficult to recognize that it has
operated.
If steering control operation is excessive or
insufficient, it can be corrected by the
driver’s operation of the steering wheel.
In situations such as the following, the lane
change assist function may be canceled:
● When the system no longer detects white
(yellow) lane lines
● When the turn signal lever is operated
fully (right/left turn position)
● When the vehicle speed is outside of the
operational range of the function
● When the system detects operation of
the steering wheel, brake or accelerator
pedal by the driver
While the lane change assist function is