2018 Lexus IS300 lane assist

2374-5. Using the driving support systems
4
Driving
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
■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 straight road or around a gentle curve with a radius of more
than approximately 492 ft. (150 m).
• No system malfunctions are detected. ( →P. 522)
●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. 95)
• 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.
●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. 95)
• 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. 522)
■Temporary cancellation of functions
When operation conditions are no longer met, a function may be temporarily canceled.
However, when the operation conditions are met again, operat ion of the function is auto-
matically restored. ( →P. 237)
■Steering control function
Depending on the vehicle speed, lane depart ure situation, road conditions, etc., the
driver may not feel the function is operating 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 off of the steering wheel, a buzzer sounds, a
warning message is displayed. 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.

2764-5. Using the driving support systems
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
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 equipped
Summary of the Blind Spot Monitor

2964-5. Using the driving support systems
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
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/VSC may not operate effectively when
Directional control and power may not be achievable wh ile driving on slippery road
surfaces, even if the TRAC/V SC 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. Reckless driving may cause an
accident. Exercise particular care when the indicator light flashes.
■When the TRAC/VSC systems are turned off
Be especially careful and drive at a speed appropriate to the road conditions. As these
are the systems to help ensure vehicle stab ility and driving force, do not turn the
TRAC/VSC systems off unless necessary.
■Replacing tires
Make sure that all tires are of the specified size, brand, tread pattern and total load
capacity. In addition, make sure that the tire s are inflated to the recommended tire infla-
tion pressure level.
The ABS, TRAC and VSC systems will not function correctly if different tires are
installed on the vehicle.
Contact your Lexus dealer for further in formation when replacing tires or wheels.
■Handling of tires and the suspension
Using tires with any kind of problem or modi fying the suspension will affect the driving
assist systems, and may cause a system to malfunction.

5238-2. Steps to take in an emergency
8
When trouble arises
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
(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. 529)
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.
(→ P. 231, 539)
→ Follow the instructions displayed on the multi-information dis-
play. ( →P. 231, 539)
If the PCS (Pre-Collision System ) or VSC (Vehicle Stability Con-
trol) system is disabled, the PC S warning light will illuminate.
→ P. 231
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.
Warning lightWarning light/Details/Actions

5658-2. Steps to take in an emergency
8
When trouble arises
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
WARNING
■When using the compact spare tire
●Remember that the compact spare tire provid ed is specifically designed for use with
your vehicle. Do not use your comp act spare tire on another vehicle.
●Do not use more than one compact spare tires simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.
■When the compact 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
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to observe
this precaution 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.
• ABS & Brake assist
•VSC
•TRAC
• Dynamic radar cruise control
•PCS
•EPS
• AFS (if equipped) • Adaptive Variable Suspension System
(if equipped)
• LDA (Lane Departure Alert with
steering control)
• Lexus parking assist monitor (if equipped)
• Intuitive parking assist (if equipped)
• Navigation system (if equipped)

646Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Jack
Positioning a floor jack ................... 469
Vehicle-equipped jack ...................557
Jack handle ............................................. 557
Jam protection function Moon roof .............................................. 159
Power windows ................................... 155
Keyless entry Smart access system with push-button start ........... 116, 122
Wireless remote control ......... 116, 122
Keys............................................................... 110 Battery-saving function .................... 128
Electronic key ......................................... 110
Engine switch ........................................ 178
If the electronic key does not operate properly ....... 569
Key number plate ................................. 110
Keyless entry ........................................... 110
Mechanical key ........................................ 111
Replacing the battery ...................... 500
Warning buzzer .................................... 117
Wireless remote control ................... 110
Knee airbags ............................................. 36 Lane Departure Alert with
steering control (LDA) ....................232
Language (multi-information display)............... 95
LATCH anchors ...................................... 58
LDA (Lane Departure Alert with steering control) .......................232
Lever Auxiliary catch lever .........................468
Hood lock release lever.................468
Internal trunk release lever ............. 124
Shift lever ................................................ 183
Tilt and telescopic steering lock release lever ............................. 147
Turn signal lever .................................. 190
Wiper lever........................................... 202
Lexus Display Audio controller ..... 306
Lexus Display Audio system ........... 304
Lexus Enform
*
Lexus Enform Remote*.................... 448
Lexus Enform Safety Connect ........443
Lexus parking assist monitor
*........ 260
Lexus Safety System+ .......................... 214 Automatic High Beam..................... 198
Dynamic radar cruise control ..... 239
LDA (Lane Departure Alert with steering control) ................... 232
PCS (Pre-Collisio n System) ......... 221
J
K
L

650Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Remote Touch*.................................... 402
Replacing Electronic key battery ..................... 500
Fuses........................................................ 502
Light bulbs ............................................ 505
Tires ......................................................... 556
Reporting safety defects for U.S. owners................................... 622
Resetting the message indicating maintenance is required ................ 460
Rev indicator ............................................. 83
Rev peak ..................................................... 83
Seat belt reminder light...................... 524
Seat belts..................................................... 30 Adjusting the seat belt ..........................31
Automatic Locking Retractor......... 32
Child restraint system installation ..............................................60
Cleaning and maintaining the seat belt .......................................457
Emergency Locking Retractor ................................................ 32
How to wear your seat belt .............30
How your child should wear the seat belt .......................................... 32
Pregnant women, proper seat belt use.......................................... 33
Reminder light and buzzer ...........524
Seat belt extender................................. 32
Seat belt pretensioners ........................31
SRS warning light............................... 522 Seat heaters.............................................. 417
Seat position memory .......................... 139
Seat ventilators........................................ 417
Seating capacity ..................................... 175
Seats, Front ............................................... 135
Adjustment..............................................135
Adjustment precautions...................136
Child seats/child restraint system installation ............................. 57
Cleaning................................................. 456
Driving position memory.................139
Head restraints ..................................... 144
Power easy access system .............139
Properly sitting in the seat ................ 28
Seat heaters ............................................ 417
Seat position memory .......................139
Seat ventilators...................................... 417
Seats, Rear ................................................ 137 Fold down the seatback................... 137
Luggage security system................. 123
Sensor Automatic headlig ht system ..........196
Inside rear view mirror..................... 150
Intuitive parking assist........................ 251
LDA (Lane Departure Alert with steering control) ................... 232
Radar sensor.............................. 216, 279
Rain-sensing windshield wipers...................................................208
Service reminder indicators ................ 76
Shift lever ...................................................183 Automatic transmission ................... 183
If the shift lever cannot be shifted from P ............. 188
S

652Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Switches
ASC (Active Sound Control) ...... 193
Audio remote control switches ................................................ 310
BSM (Blind Spot Monitor) switch.................................................... 276
Door lock switches .............................. 118
Driving mode select switch ......... 288
Driving position memory switches ................................................ 139
Dynamic radar cruise control switch ...................................239
Emergency flashers switch ............ 512
Engine switch ........................................ 178
Garage door opener switches ............................................... 432
Heated steering wheel switch..................................................... 416
Ignition switch ....................................... 178
Intuitive parking assist ....................... 251
LDA (Lane Departure Alert) switch....................................................235
Light switches ....................................... 194
Meter control switches ......................89
Moon roof switches........................... 158
Outside rear view mirror switches .................................................. 151 Paddle shift switches......................... 185
Power window switches ..................154
Rear sunshade switch ..................... 429
Rear window and outside
rear view mirror defoggers
switch ..................................................... 412
Seat heater switches .......................... 417
Seat ventilator switches .................... 417
Snow mode switch .............................184
Steering wheel switch ........................ 89
“SOS” button ....................................... 443
Talk switch............................................. 373
Telephone switches.......................... 373
Tilt and telescopic steering control switch .................. 147
Tire pressure warning reset switch ...................................................485
Trunk opener main switch .............. 123
Trunk opener switch .......................... 122
Vehicle-to-vehicle distance switch ................................................... 245
VSC OFF switch ............................... 294
Window lock switch ..........................154
Windshield wiper and washer switch ......................... 202
Windshield wiper de-icer switch ..................................................... 412