Lexus LS500h, Manual, Page: 242 / 524

242
4-5. Using the driving support systems
LS500h_OM_(U)_1810
cle speed is less than approximately 32
mph (50 km/h) when the lane center-
ing function is operating.
*2
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
● Steering assist function
This function operates when all of the fol-
lowing conditions are met in addition to the
operation conditions for the lane depar-
ture alert function.
• Setting for “Steering Assist” in
of the
multi-information display is set to “ON”.
(

P.90)
• Vehicle is not accelerated or decelerated
by a fixed amount or more.
• Steering wheel is not operated with a
steering force level suitable for changing
lanes.
• 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)
●
Vehicle sway warning function
This function operates when all of the fol-
lowing conditions are met.
• Setting for “Sway Warning” in
of the
multi-information display is set to “ON”.
(

P.90)
• Vehicle speed is approximately 32 mph
(50 km/h) or more.
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• No system malfunctions are detected.
(

P.245)
● Lane centering function
This function operates when all of the fol-
lowing conditions are met.
• LTA is turned on.
• Setting for “Steering Assist” and “Lane
Center” in of the multi-information
display are set to “ON”. (

P.90)
• This function recognizes white (yellow)
lane lines or the position of a preceding
vehicle (except when the preceding vehi-
cle is small, such as a motorcycle).
• The dynamic radar cruise control with
full-speed range is operating in vehi-
cle-to-vehicle distance control mode.
• Width of traffic lane is approximately 10
to 13 ft. (3 to 4 m).
• Turn signal lever is not operated.
• Vehicle is not being driven around a
sharp curve.
• No system malfunctions are detected.
(

P.245)
• Vehicle does not accelerate or deceler-
ate by a fixed amount or more.
• Steering wheel is not operated with a
steering force level suitable for changing
lanes.
• 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 driver has one or both hands on the
steering wheel.
• The vehicle is being driven in the center
of a lane.
• Steering assist function is not operating.
● Lane change assist function (vehicles with
Lexus Safety A)
This function will operate when all of the
following conditions are met:
• The lane centering function is operating.
• “Lane Change Assist” is set to “ON” in
of the multi-information dis-
play.(

P.90)
• The vehicle speed is between approxi-
mately 57 and 85 mph (90 and 140
km/h).
• White (yellow) lane lines are detected by
the system.
• A broken white line is detected between
your vehicle and the lane toward which
the turn signal is operated.
• The turn signal lever is held partway (lane
change position) for approximately 1 sec-
ond.
• A vehicle is not overtaking your vehicle
or detected in the lane toward which the
turn signal is operated.
• The vehicle is being driven straight or
around a slight curve.
• The vehicle is not accelerating or decel-
erating more than a certain amount.
• The steering wheel is not being turned
sufficiently to perform a lane change.