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266 4-5. Using the driving support systems
RC F_U ■
Operation conditions of each function ●
Lane departure alert function
This function operates when all of the following conditions are met.
• LDA is turned on.
• Vehicle speed is approximatel y 32 mph (50 km/h) or more.
• System recognizes white (yellow) lines.
• Width of traffic lane is approx imately 9.8 ft. (3 m) or more.
• Turn signal lever is not operated.
• Vehicle is driven on a stra ight road or around a gentle curve with a radius of more
than approximately 492 ft. (150 m).
• No system malfunctions are detected. (  P. 453)●
Steering control function
This function operates when all of the follo wing conditions are met in addition to the
operation conditions for the lane departure alert function.
• Setting for Steering Assist in of th e multi-information display is set to On.
(  P. 111)
• Vehicle is not accelerated or dece lerated 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 operating.
• TRAC or VSC is not turned off.
• Hands off steering wheel alert is not displayed. (  P. 266)●
Vehicle sway warning function
This function operates when all of the following conditions are met.
• Setting for Sway Warning in of the multi-information display is set to On.
(  P. 111)
• Vehicle speed is approximatel y 32 mph (50 km/h) or more.
• Width of traffic lane is approx imately 9.8 ft. (3 m) or more.
• No system malfunctions are detected. (  P. 453)■
Temporary cancellation of functions
When operation conditions are no longer met, a function may be temporarily canceled.
However, when the operation co nditions are met again, operat ion of the function is auto-
matically restored. (  P. 266)■
Steering control function
Depending on the vehicle speed, lane depart ure situation, road conditions, etc., the
driver may not feel the function is operat ing or the function may not operate at all.■
Lane departure alert function
The warning buzzer may be difficult to hear due to external noise, audio playback, etc.
Also, it may be difficult to f eel steering wheel vibrations due to the road conditions, etc.■
Hands off steering wheel alert
When the system determines that the driver has removed the hands from the steering
wheel while the steering control function is operating, a warning message is displayed on
the multi-information display.
If the driver continues to keep the hands of f of the steering wheel, a warning message is
displayed and the function is temporarily canc eled. This alert also operates in the same
way when the driver continuously operates the steering wheel only a small amount.
However, depending on the road conditions, etc., the function may not cancel.

268 4-5. Using the driving support systems
RC F_U In vehicle-to-vehicle distance control mode, the vehicle automatically acceler-
ates and decelerates 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 control on freeways and highways. ●
Vehicle-to-vehicle distance control mode (  P. 271)●
Constant speed control mode (  P. 276)
Vehicle-to-vehicle distance switch
Display
Set speed
Indicators
Cruise control switchDynamic radar cruise control Summary of functions 1
2
3
4
5

272 4-5. Using the driving support systems
RC F_U Press the “ON/OFF” button to acti-
vate the cruise control. Radar cruise control indicator will come
on and a message will be displayed on
the multi-information display.
Press the button again to deactivate the
cruise control.
If the “ON/OFF” button is pressed and
held for 1.5 seconds or more, the system
turns on in constant speed control
mode. (  P. 276)
Accelerate or decelerate, with
accelerator pedal operation, to the
desired vehicle speed (at or above
approximately 30 mph [50 km/h])
and push the lever down to set the
speed. Cruise control “SET” indicator will come
on.
The vehicle speed at the moment the
lever is released becomes the set speed.Setting the vehicle speed (vehicle-to-vehicle distance control mode) 1
2

274 4-5. Using the driving support systems
RC F_U Pressing the switch changes the vehi-
cle-to-vehicle distance as follows:
Long
Medium
Short The vehicle-to-vehicle distance is set
automatically to long mode when the
engine switch is turned to IGNITION
ON mode.
If a vehicle is running ahead of you, the pr eceding vehicle mark w ill also be displayed.
Select a distance from the table below. Note that the distances shown corre-
spond to a vehicle speed of 50 mph (8 0 km/h). Vehicle-to-vehicle distance
increases/decreases in accord ance with vehicle speed.
Pulling the lever toward you cancels
the speed control. The speed control is also canceled when
the brake pedal is depressed.
Pushing the lever up resumes the
cruise control and returns vehicle
speed to the set speed. However, cruise control does not
resume when the vehicle speed is
approximately 25 mph (40 km/h) or
less.Changing the vehicle-to-vehicle distance (vehicle-to-vehicle distance
control mode) Preceding
vehicle mark1
2
3
Vehicle-to-vehicle distance settings (vehicle-to-vehicle distance con-
trol mode) Distance options Vehicle-to-vehicle distance
Long Approximately 160 ft. (50 m)
Medium Approximately 130 ft. (40 m)
Short Approximately 100 ft.(30 m)
Canceling and resuming the speed control 1
2

2754-5. Using the driving support systems
4
Driving
RC F_U When your vehicle is too close to a
vehicle ahead, and sufficient automatic
deceleration via the cruise control is
not possible, the display will flash and
the buzzer will sound to alert the driver.
An example of this would be if another
driver cuts in front of you while you are
following a vehicle. Depress the brake
pedal to ensure an appropriate vehicle-
to-vehicle distance. ■
Warnings may not occur when
In the following instances, warnings ma y not occur even when the vehicle-to-
vehicle distance is small. ●
When the speed of the preceding vehicle matches or exceeds your vehicle
speed ●
When the preceding vehicle is traveling at an extremely slow speed ●
Immediately after the crui se control speed was set●
When depressing the accelerator pedalApproach warning (vehicle-to-vehicle distance control mode)

278 4-5. Using the driving support systems
RC F_U ■
Automatic cancelation of co nstant speed control mode
Constant speed control mode is automatica lly canceled in the following situations:●
Actual vehicle speed is more than approxim ately 10 mph (16 km/h) below the set vehi-
cle speed. ●
Actual vehicle speed falls below approximately 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 . Contact your Lexus dealer.■
Warning messages and buzzers fo r dynamic radar cruise control
Warning messages and buzzers are used to indicate a system malfunction or to inform
the driver of the need for ca ution while driving. If a warn ing message is shown on the
multi-information display, read the message and follow the instructions.■
When the sensor may not be correctly detecting the vehicle ahead
In the case of the following and depending on the conditions, operate the brake pedal
when deceleration of the system is insuff icient or operate the accelerator pedal when
acceleration is required.
As the sensor may not be able to correctly detect these types of vehicles, the approach
warning (  P. 275) may not be activated.●
Vehicles that cut in suddenly ●
Vehicles traveling at low speeds ●
Vehicles that are not moving in the same lane ●
Vehicles with small rear ends (traile rs with no load on board, etc.)
●
Motorcycles travelin g in the same lane●
When water or snow thrown up by the surrounding vehicles hinders the detecting of
the sensor

280 4-5. Using the driving support systems
RC F_U ■
Types of sensors 
RC350/RC300 
RC FIntuitive parking assist 
 : If equippedThe distance from your vehicle to near by obstacles when parallel parking or
maneuvering into a garage is measured by the sensors and communicated via
the multi-information display, Center Display and a buzzer. Always check the
surrounding area when using this system.
Front center sensors
Front corner sensors Rear corner sensors
Rear center sensors1
2 3
4

282 4-5. Using the driving support systems
RC F_U When the sensors detect an obstacle , a graphic is shown on the multi-
information display and Center Display depending on the position and distance
to the obstacle. ■
Multi-information display
■
Center Display
A graphic is shown when the Lexus
parking assist monitor is displayed
(insert display).
A simplified image is displayed on
the upper right corner of the screen
when an obstacle is detected.Display 
RC350/RC300 
RC F
Front corner sensor detection
Front center sensor detection Rear corner sensor detection
Rear center sensor detection1
2 3
4

2834-5. Using the driving support systems
4
Driving
RC F_U ■
Multi-information display and Center Display
Sensors that detect an obstacle will illuminate continuously or blink. 
RC350/RC300
Sensor detection display, obstacle distance Multi-
information
display Insert display
(Center Dis-
play) Approximate distance to obstacle
Corner sensor/
front center sensor Rear center sensor
(continuous) (blinking slowly) Front center sensor
only:
3.3 ft. (100 cm) to 1.6 ft.
(50 cm) 4.9 ft. (150 cm) to 2.0
ft. (60 cm)
(continuous) (blinking) 1.6 ft. (50 cm) to 1.3 ft.
(40 cm) 2.0 ft. (60 cm) to 1.5 ft.
(45 cm)
(continuous) (blinking rapidly) 1.3 ft. (40 cm) to 1.0 ft.
(30 cm) 1.5 ft. (45 cm) to 1.1 ft.
(35 cm)
( blinking ) (continuous) Less than 1.0 ft. (30 cm) Less than 1.1 ft. (35 cm)

284 4-5. Using the driving support systems
RC F_U 
RC F Multi-
information
display Insert display
(Center Dis-
play) Approximate distance to obstacle
Corner sensor Rear center sensor
(continuous) (blinking slowly)  4.9 ft. (150 cm) to 2.0
ft. (60 cm)
(continuous) (blinking) Front corner sensor:
1.6 ft. (50 cm) to 1.3 ft.
(40 cm)
Rear corner sensor:
2.0 ft. (60 cm) to 1.5 ft.
(45 cm) 2.0 ft. (60 cm) to 1.5 ft.
(45 cm)
(continuous) (blinking rapidly) Front corner sensor:
1.3 ft. (40 cm) to 1.0 ft.
(30 cm)
Rear corner sensor:
1.5 ft. (45 cm) to 1.0 ft.
(30 cm) 1.5 ft. (45 cm) to 1.1 ft.
(35 cm)
(blinking) (continuous) Less than 1.0 ft. (30 cm) Less than 1.1 ft. (35 cm)