lane assist LEXUS RCF 2019 User Guide

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.

290 4-5. Using the driving support systems
RC F_U The Blind Spot Monitor is a system that has 2 functions: ●
The BSM (Blind Spot Monitor) function
Assists the driver in making a decision when changing lanes●
The RCTA (Rear Cross Traffic Alert) function
Assists the driver when backing up
These functions use same sensors.
BSM (Blind Spot Monitor) 
 : If equippedSummary of the Blind Spot Monitor

318 4-5. Using the driving support systems
RC F_U WARNING ■
The ABS does not operate effectively when ●
The limits of tire gripping performance have been exceeded (such as excessively
worn tires on a snow covered road). ●
The vehicle hydroplanes while driving at high speed on wet or slick roads.■
Stopping distance when the ABS is operating may exceed that of normal conditions
The ABS is not designed to shorten the vehi cle’s stopping distance . Always maintain a
safe distance from the vehicle in front of you, especially in the following situations: ●
When driving on dirt, grav el or snow-covered roads●
When driving with tire chains ●
When driving over bumps in the road ●
When driving over roads with potholes or uneven surfaces■
TRAC may not operate effectively when
Directional control an d power may not be achievable wh ile driving on slippery road
surfaces, even if the TRAC system is operating.
Drive the vehicle carefully in conditions where stability and power may be lost.■
Hill- start assist control does not operate effectively when ●
Do not overly rely on hill-start assist control. Hill-start assist control may not operate
effectively on steep inclines and roads covered with ice. ●
Unlike the parking brake, hill-start assist co ntrol is not intended to hold the vehicle
stationary for an exte nded period of time. Do not atte mpt to use hill-start assist con-
trol to hold the vehicle on an incline, as doing so may lead to an accident.■
When the VSC is activated
The slip indicator light flashes. Always drive carefully. Reckle ss driving may cause an
accident. Exercise particular care when the indicator light flashes.

454 7-2. Steps to take in an emergency
RC F_U (U.S.A.)
(Canada)
Parking brake warning light (warning buzzer)
* 1
Indicates that the parking brake is engaged
 Release the parking brake.
Electric power steering system warning light (warning buzzer)
Indicates a malfunction in the EPS (Electric Power Steering) sys-
tem
 Have the vehicle inspected by your Lexus dealer immediately.
LDA (Lane Departure Alert) indicator
If the LDA indicato r is illuminated:
Indicates a malfunction in the LDA (Lane Departure Alert with
steering control) system.
 Check the warning message displa yed on the multi-information
display. (  P. 460)
If the LDA indicator flashes:
Indicates that the vehicle has deviated from the lane (while the
LDA [Lane Departure Alert with stee ring control] system is oper-
ating)
 Check the area around the vehicle and return the vehicle to
between the lane lines. (Flashes or illuminates)
PCS warning light
Indicates a malfunction in the PCS (Pre-Collision System) or that
the system is temporarily unavailable due to the vehicle being
extremely hot/cold, or dirt around a front sensor, etc.
 Follow the instructions displaye d on the multi-information dis-
play. (  P. 260, 470)
If the PCS (Pre-Collision System ) or VSC (Vehicle Stability Con-
trol) system is disabled, the PC S warning light will illuminate.
(  P. 260)
Slip indicator
Indicates a malfunction in:
• The VSC (Vehicle Stability Control) system;
• The TRAC (Traction Control) system; or
• The hill-start assist control system
The light will flash when the VSC or the TRAC system is operating.
 Have the vehicle inspected by your Lexus dealer immediately. (If equipped)
Automatic headlight leve ling system warning light
Indicates a malfunction in the automatic headlight leveling system
 Have the vehicle inspected by your Lexus dealer immediately.
Open door warning light (warning buzzer)
* 2
Indicates that a door or the trunk is not fully closed
 Check that both side doors and the trunk are closed.Warning light Warning light/Details/Actions

5017-2. Steps to take in an emergency
RC F_U 7
When trouble arises WARNING ■
When using the spare tire ●
Remember that the spare tire provided is specifically designed for use with your vehi-
cle. Do not use your spare tire on another vehicle. ●
Do not use more than one spare tires simultaneously. ●
Replace the spare tire with a stan dard tire as soon as possible.●
Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking. ■
When the spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may not
operate correctly:
Also, not only can the following system not be utilized fully, but it may even negatively
affect the drive-train components:
• AWD system (if equipped) ■
Speed limit when using the spare tire
Do not drive at speeds in excess of 50 mp h (80 km/h) when a spar e tire is installed on
the vehicle.
The spare tire is not designed for driving at high speeds. Fa ilure to observe this precau-
tion may lead to an accident causing death or serious injury. ■
After using the tools and jack
Before driving, make sure all the tools and jack are securely in place in their storage
location to reduce the possibilit y of personal injury during a collision or sudden brak-
ing.
NOTICE ■
Driving with tire chains and the spare tire
Do not fit tire chains to the spare tire.
Tire chains may damage the vehicle body and adversely affect driving performance.■
When replacing the tires
When removing or fitting the wheels, tires or the tire pressure warning valve and trans-
mitter, contact your Lexus dealer as the tire pressure warning valve and transmitter
may be damaged if not handled correctly.• ABS & Brake assist
•VSC
•TRAC
• Dynamic radar cruise control
•PCS
•EPS
• Adaptive Variable Suspension System
(if equipped)
• LDA (Lane Departure Alert with
steering control)
• VGRS (if equipped) • LDH (Lexus Dynamic Handling sys-
tem) (if equipped)
• DRS (Dynamic Rear Steering) (if
equipped)
• VDIM (Vehicle Dynamics Integrated
Management)
• Tire pressure warning system
• Lexus parking assist monitor
• Intuitive parking assist (if equipped)
• Navigation system (if equipped)

625Alphabetical index
RC F_U Lane Departure Alert with
steering control (LDA) .....................261
Language (multi-information
display)..............................................111, 129
LATCH anchors ........................................ 71
LDA (Lane Departure Alert
with steering control) ........................261
LDH (Lexus Dynamic Handling
system).....................................................313
Lever
Auxiliary catch lever .........................393
Hood lock release lever .................393
Internal trunk release lever............. 153
Shift lever ..................................................213
Tilt and telescopic steering
lock release lever..............................174
Turn signal lever ................................... 221
Wiper lever ........................................... 233
Lexus Enform
* Lexus Enform Safety Connect........ 370
Lexus parking assist monitor
* Lexus Safety System+ .........................245
Automatic High Beam.................... 228
Dynamic radar cruise control .....268
LDA (Lane Departure Alert
with steering control) ..................... 261
PCS (Pre-Collision System) .......250
License plate lights ...............................225
Light switch........................................... 225
Replacing light bulbs ....................... 439
Light bulbs
Replacing ............................................... 434
Wattage .................................................553
Lights
Automatic High Beam system ... 228
Fog light switch ................................... 232
Headlight switch ................................ 225
Illuminated entry system.................348
Interior lights ........................................348
Interior lights list.................................. 347
Personal lights ..................................... 349
Replacing light bulbs ....................... 434
Trunk light................................................153
Turn signal lever ................................... 221
Vanity lights .......................................... 354
Wattage .................................................553
Lock steering column........................... 210
Low profile tire ........................................ 415
Luggage security system .................... 152L
* : Refer to the “NAVIGATIO N AND MULTIMEDIA SYSTEM
OWNER’S MANUAL”.

631Alphabetical index
RC F_U Switches
Active rear wing switch ..................307
ASC (Active Sound Control)
switch.................................................... 223
Audio remote control
switches
* Automatic High Beam system ....228
BSM (Blind spot monitor)
switch................................................... 290
Cruise control switch...................... 268
Door lock switches .............................147
Driving mode select switch ........... 301
Driving position memory
switches ................................................ 166
Emergency flashers switch ........... 442
Engine switch .......................................207
Fog light switch ................................... 232
Garage door opener
switches .............................................. 359
Heated steering wheel
switch....................................................344
Ignition switch ......................................207
Intuitive parking assist switch ........ 281
LDA (Lane Departure Alert
with steering control) switch ....264
Light switches ...................................... 225
Meter control switches ........... 106, 119 Moon roof switches .......................... 186
Outside rear view mirror
switches ................................................178
Paddle shift switches............... 215, 216
Power door lock switch ................... 147
Power window switches ..................182
Rear window and outside
rear view mirror defoggers
switch ...................................................338
Seat heater switches ........................ 345
Seat ventilator switches .................. 346
Snow mode switch ............................. 214
“SOS” button ....................................... 370
Talk switch
* Telephone switches
* Tilt and telescopic
steering control switch .................. 174
Tire pressure warning reset
switch ..................................................... 414
Trunk opener main switch .............. 152
Trunk opener switch ........................... 151
TVD (Torque Vectoring
Differential) switch .......................... 310
Vehicle-to-vehicle distance
button ....................................................274
VSC OFF switch ................................. 314
Window lock switch ..........................182
Windshield wiper
and washer switch ......................... 233
Windshield wiper de-icer
switch ................................................... 339
* : Refer to the “NAVIGATIO N AND MULTIMEDIA SYSTEM
OWNER’S MANUAL”.

634 Alphabetical index
RC F_U Units ......................................................111, 129
Vanity lights............................................. 354
Wattage ................................................. 553
Vanity mirrors ........................................ 354
Variable Gear Ratio Steering
(VGRS) ...................................................312
Warning message ............................ 460
VDIM (Vehicle Dynamics
Integrated Manag ement) ................313
Vehicle data recordings .......................... 9
Vehicle Dynamics Integrated
Management (VDIM) .......................313
Vehicle identification number ......... 537
Vehicle Stability Control
(VSC) .......................................................312
Ventilators (seat ventilators)............ 346
VGRS (Variable Gear Ratio
Steering) .................................................312
Warning message ............................ 460
VSC
(Vehicle Stability Control) ..............312 Warning buzzers
Approach warning ........................... 275
Brake system ....................................... 462
Downshifting ..........................................218
Intuitive parking assist......................280
Key reminder .......................................485
LDA (Lane Departure Alert
with steering control) ................... 469
Open door ........................................... 454
Open hood........................................... 463
Open moon roof ............................... 473
Open trunk ........................................... 463
Open window ..................................... 473
Pre-collision braking.......................... 251
Seat belt reminder.............................455
Warning lights .......................................... 86
ABS .......................................................... 453
Automatic headlight leveling
system .................................................. 454
Brake system ....................................... 453
Charging system ............................... 453
Electric power steering .................. 454
Low fuel level .......................................455
LDA indicator...................................... 454
Malfunction indicator lamp........... 453
Master warning light ........................455
Open door ........................................... 454
Parking brake warning light ......... 454
Pre-collision system ......................... 454
Seat belt reminder light ..................455
Slip indicator ........................................ 454
SRS............................................................ 453
Tire pressure ........................................455
Warning messages.............................. 460U
V W