2018 LEXUS LS500 sensor

238 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) For how to change settings, refer to
→ P.468 *
: If equipped
Vehicle sway
warning function Turn function on and
off
Adjust alert sensitivity
Lane centering
function Turn function on and
offFunction Setting details
RSA (Road Sign Assist) *
The RSA system recognizes spe-
cific road signs using the camera
sensor and navigation system
(when data is available) to provide
information to the driver via the
multi-information display and
head-up display.
If the system judges that the vehicle
is being driven over the speed limit,
performing prohibited actions, etc.
in relation to the recognized road
signs, it alerts the driver using a
warning display and warning
buzzer *
. *
: This setting needs to be customized.
WARNING
■
Before using the RSA
Do not rely solely upon the RSA system.
RSA is a system which supports the
driver by providing information, but it is
not a replacement for a driver’s own
vision and awareness. Drive safely by
always paying careful attention to the
traffic rules.
Inappropriate or neg ligent driving could
lead to an unexpected accident.

2394-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving When the camera sensor recognizes a
sign or information of a sign is available
from the navigation system, the sign
will be displayed on the multi-informa-
tion display.
 When the driving support system
information is selected, a maximum
of 3 signs can be displayed. ( → P.76)  When a tab other than the driving
support system information tab is
selected, only a recognized speed
limit sign or do not enter sign (when
notification is necessary) will be dis-
played. ( → P.76)
If signs other than speed limit signs are rec-
ognized, they will be displayed in an over-
lapping stack under th e current speed limit
sign.
The following types of ro ad signs are recognized.Non-official or recently introduced traffic signs may not be recognized.Indication on the multi-informa-
tion display
Supported types of road signs Type Multi-information display
Speed limit begins/ends *
Do Not Enter
Stop
Yield

240 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) *
: Displayed when speed limit information for th e road is available from the navigation sys-
tem
In the following situations, the RSA sys-
tem will alert the driver.
 When the vehicle speed exceeds
the speed warning threshold of the
speed limit sign displayed, the sign
display will be emphasized and a
buzzer will sound.
 When the RSA system recognizes a
do not enter sign and determines
that your vehicle has entered a
no-entry area, the displayed sign will
flash and a buzzer will sound.
Depending on the situation, traffic
environment (traffic direction, speed,
unit) may be detected incorrectly and a
warning display may not operate prop-
erly. ■
Turning the system on/off
1 Select on of the
multi-information display ( → P.76)
2 Press on the steering wheel.
■
Automatic turn-off of RSA sign display
In the following situations, a displayed
speed limit sign will stop being displayed
automatically:
●
A new sign is not recognized for a certain
distance. (When speed limit information
is not available from the navigation sys-
tem)
In the following situations, do not enter, stop
and yield signs will st op being displayed
automatically:
●
The system determines that your vehicle
has passed the sign.
●
The road changes due to a left or right turn, etc. ■
Conditions in which the function may
not operate or detect correctly
In the following situations, RSA does not
operate normally and may not recognize
signs, display the incorrect sign, etc. How-
ever, this does not indicate a malfunction. ●
The camera sensor is misaligned due to a
strong impact being applied to the sen-
sor, etc. ●
Dirt, snow, stickers, etc. are on the wind-
shield near the camera sensor. ●
In inclement weather such as heavy rain,
fog, snow or sand storms ●
Light from an oncoming vehicle, the sun,
etc. enters the camera sensor. ●
The sign is dirty, faded, tilted or bent. ●
All or part of the sign is hidden by the
leaves of a tree, a pole, etc. ●
The sign is only visible to the camera sen-
sor for a short amount of time. ●
The driving scene (turning, lane change,
etc.) is judged incorrectly. ●
Even if it is a sign not appropriate for the
currently traveled lane, such a sign exists
directly after a freeway branches, or in an
adjacent lane just before merging. ●
Stickers are attached to the rear of the
preceding vehicle. ●
A sign resembling a system compatible
sign is recognized. ●
The front of the vehicle is raised or low-
ered due to the carried load.
●
The surrounding brightness is not suffi-
cient or changes suddenly.
●
When a sign intended for trucks, etc. is
recognized.
●
The navigation system map data is old.
●
The navigation system is not operating.
●
Side road speed signs may be detected
and displayed (if positioned in sight of the
camera sensor) while the vehicle is trav-
eling on the main road.Warning indication

2414-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ●
Roundabout exit road speed signs may
be detected and displayed (if positioned
in sight of the camera sensor) while trav-
eling on a roundabout.■
Speed limit sign display
If the engine switch wa s last turned off while
a speed limit sign wa s displayed on the
multi-information display, the same sign dis-
plays again when the engine switch is
turned to IGNITION ON mode. ■
Customization
Some functions can be customized.
( → P.468)
■
Meter display
Display
Set speed
IndicatorsDynamic radar cruise con-
trol with full-speed range In vehicle-to-vehicle distance con-
trol mode, the ve hicle automati-
cally accelerates, decelerates and
stops to match the speed changes
of the preceding vehicle even if the
accelerator pedal is not depressed.
In constant speed control mode,
the vehicle runs at a fixed speed.
Use the dynamic radar cruise con-
trol with full-speed range on free-
ways and highways.
 Vehicle-to-vehicle distance con-
trol mode ( → P.244)
 Constant speed control mode
( → P.248)
System Components
A
B
C

2434-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving WARNING■
To avoid inadvertent dynamic radar
cruise control with full-speed range
activation
Switch the dynamic radar cruise control
with full-speed range setting to off, using
the cruise control main switch when not
in use. ■
Situations unsuitable for dynamic
radar cruise control with full-speed
range
Do not use dynamic radar cruise control
with full-speed range in any of the follow-
ing situations.
Doing so may result in inappropriate
speed control and could cause an acci-
dent resulting in death or serious injury. ●
Roads where there are pedestrians,
cyclists, etc.●
In heavy traffic●
On roads with sharp bends●
On winding roads●
On slippery roads, such as those cov-
ered with rain, ice or snow●
On steep downhills , or where there
are sudden changes between sharp up
and down gradients
Vehicle speed may exceed the set
speed when driving down a steep hill.
●
At entrances to freeways and highways
●
When weather conditions are bad
enough that they may prevent the sen-
sors from detectin g correctly (fog,
snow, sandstorm, heavy rain, etc.)
●
When there is rain, snow, etc. on the
front surface of the radar sensor or
camera sensor
●
In traffic conditions that require fre-
quent repeated acceleration and
deceleration
●
When an approach warning buzzer is
heard often

244 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) This mode employs a radar sensor to detect the presence of vehicles up to approx-
imately 328 ft. (100 m) ahead, determines the current vehicle-to-vehicle following
distance, and operates to maintain a suit able following distance from the vehicle
ahead. Note that vehicle-to-vehicle di stance will close in when trav eling on long downhill slopes.
Example of constant speed cruising
When there are no vehicles aheadThe vehicle travels at the speed set by the driver. The desired vehicle-to-vehicle distance
can also be set by operating the ve hicle-to-vehicle distance switch.
Example of deceleration cruising and follow-up cruising
When a preceding vehicle driving slower than the set speed appearsWhen a vehicle is detected running ahead of you, the system automatically decelerates
your vehicle. When a greater reduction in vehicle speed is necessary, the system applies
the brakes (the stop lights will come on at this time). The sy stem will respond to changes in
the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle distance set by
the driver. Approach warning warns you when th e system cannot decelera te sufficiently to
prevent your vehicle from closing in on the vehicle ahead.
When the vehicle ahead of you stops, your vehi cle will also stop (vehicle is stopped by sys-
tem control). After the vehicle ahead starts off, pressing the “+RES” switch or depressing
the accelerator pedal will resume follow-up cruising.
Vehicles with Lexus Safety System+A: If your vehicle is being driven at approximately 43
mph (70 km/h) or more, when the turn signal is operated and a lane change is made to
pass the vehicle ahead, the system will start acce lerating your vehicle up to the set speed to
assist smooth overtaking.
Example of acceleration
When there are no longer any preceding vehicles driving slower than the set Driving in vehicle-to-vehicle distance control mode
A
B
C

248 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) cle-to-vehicle distance.
■
Warnings may not occur when
In the following instances, warnings
may not occur even when the vehi-
cle-to-vehicle distance is small.
 When the speed of the preceding
vehicle matches or exceeds your
vehicle speed
 When the preceding vehicle is trav-
eling at an extremely slow speed
 Immediately after the cruise control
speed was set
 When depressing the accelerator
pedal
When constant speed control mode is
selected, your vehicle will maintain a
set speed without controlling the vehi-
cle-to-vehicle distance. Select this
mode only when vehicle-to-vehicle dis-
tance control mode does not function
correctly due to a dirty radar sensor,
etc.
1 With the cruise control off, press
and hold the cruise control main
switch for 1.5 seconds or more. Immediately after the switch is pressed, the
radar cruise control indicator will come on.
Afterwards, it switches to the cruise con-
trol indicator.
Switching to constant speed control mode
is only possible when operating the switch
with the cruise control off.
2 Accelerate or decelerate, with
accelerator pedal operation, to the
desired vehicle speed (at or above
approximately 25 mph [40 km/h])
and press the “-SET” switch to set
the speed. Cruise control “SET” indicator will come
on.
The vehicle speed at the moment the
switch is released becomes the set speed.
Adjusting the speed setting: → P.245
Canceling and resuming the speed setting:
→ P.247
■
Dynamic radar cruise control with
full-speed range can be set when
●
The shift position is in D.
●
Range 4 or higher of D has been selected Selecting constant speed con-
trol mode

2494-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving by using the paddle shift switch.●
Vehicle speed is at or above approxi-
mately 30 mph (50 km/h).
However, when a preceding vehicle is
detected, the dynamic radar cruise con-
trol with full-speed range can be set even
if the vehicle speed is below approxi-
mately 30 mph (50 km/h).■
Accelerating after setting the vehicle
speed
The vehicle can accelerate by operating the
accelerator pedal. After accelerating, the
set speed resumes. However, during vehi-
cle-to-vehicle distance control mode, the
vehicle speed may decrease below the set
speed in order to maintain the distance to
the preceding vehicle. ■
When the vehicle stops while follow-up
cruising●
Pressing the “+RES” switch while the
vehicle ahead stops w ill resume follow-up
cruising if the vehicle ahead starts off
within approximately 3 seconds after the
switch is pressed.●
If the vehicle ahead starts off within 3 sec-
onds after your vehicle stops, follow-up
cruising will be resumed.■
Automatic cancelation of vehi-
cle-to-vehicle distance control mode
Vehicle-to-vehicle dist ance control mode is
automatically canceled in the following situ-
ations. ●
Actual vehicle speed falls at or below
approximately 25 mph (40 km/h) when
there are no vehicles ahead.●
The preceding vehicle leaves the lane
when your vehicle is following at a vehicle
speed at or below approximately 25 mph
(40 km/h). Otherwise, the sensor cannot
properly detect the vehicle. (“CRUISE
NOT AVAILABLE No Preceding Vehi-
cles” is displayed on the multi-information
display.)
●
VSC is activated.
●
TRAC is activated for a period of time.
●
When the VSC or TRAC system is
turned off.
●
When snow mode is set. ●
The sensor cannot detect correctly
because it is covered in some way. ●
Pre-collision braking is activated. ●
The parking brake is operated. ●
The vehicle is stopped by system control
on a steep incline. ●
The following are detected when the
vehicle has been stopped by system con-
trol:
• The driver is not wearing a seat belt.
• The driver’s door is opened.
• The vehicle has been stopped for about 3
minutes.
If vehicle-to-vehicle distance control mode
is automatically canceled for any other rea-
son, there may be a malfunction in the sys-
tem. Contact your Lexus dealer. ■
Automatic cancelation of constant
speed control mode
Constant speed control mode is automati-
cally canceled in the following situations: ●
Actual vehicle speed is more than
approximately 10 mph (16 km/h) below
the set vehicle speed. ●
Actual vehicle speed falls below approxi-
mately 25 mph (40 km/h). ●
VSC is activated. ●
TRAC is activated for a period of time. ●
When the VSC or TRAC system is
turned off. ●
Pre-collision braking is activated.
If constant speed control mode is automati-
cally canceled for any other reason, there
may be a malfunction in the system. Con-
tact your Lexus dealer.
■
If “Radar Cruise Control Unavailable” is
shown on the multi-information display
The radar cruise control system cannot be
used temporarily. Use the system when it
becomes available again.
■
Brake system operation sound
When the brakes are operated in vehi-
cle-to-vehicle distance mode, a brake oper-
ating sound may be heard. This is not a
malfunction.