cruise control LEXUS RX450h 2018 Owner's Manual

3154-5. Using the driving support systems
4
Driving
RX450h_RX450hL _U_OM48F85UWhen constant speed control mode is se lected, your vehicle will maintain a set
speed without controlling the vehicle-to-veh icle distance. Select this mode only
when vehicle-to-vehicle distance control mode does not function correctly due
to a dirty radar sensor, etc.
With the cruise control off, press and
hold the “ON/OFF” button for 1.5
seconds or more. Immediately after the “ON/OFF” but-
ton is pressed, the radar cruise control
indicator will come on. Afterwards, it
switches to the cruise control indicator.
Switching to constant speed control
mode is only possible when operating
the lever with the cruise control off.
Accelerate or decelerate, with
accelerator pedal operation, to the
desired vehicle speed (at or above
approximately 25 mph [40 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.
Adjusting the speed setting: → P. 311
Canceling and resuming the speed setting: → P. 313Selecting constant speed control mode 1
2

316 4-5. Using the driving support systems
RX450h_RX450hL _U_OM48F85U■
Dynamic radar cruise control with full-speed range can be set when ●
The shift lever is in D or range 4 or higher of S has been selected.●
Range 4 or higher has been selected by using the paddle shift switch.
(vehicles with padd le shift switches)●
Vehicle speed is at or abov e approximately 30 mph (50 km/h). However, when a pre-
ceding vehicle is detected, the dynamic ra dar cruise control with full-speed range can
be set even if the vehicle speed is below approximately 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 vehicle-to-vehicle distance control mode, the vehi-
cle speed may decrease below the set speed in order to maintain the distance to the pre-
ceding vehicle. ■
When the vehicle stops while follow-up cruising ●
Pushing the lever up while the vehicle ahead stops will resume follow-up cruising if the
vehicle ahead starts off within approximat ely 3 seconds after the switch is pressed.●
If the vehicle ahead starts off within 3 seco nds after your vehicle stops, follow-up cruis-
ing will be resumed. ■
Automatic cancelation of vehicle- to-vehicle distance control mode
Vehicle-to-vehicle distance control mode is automatically canceled in the following situ-
ations. ●
Actual vehicle speed falls below approximately 25 mph (40 km/h) when there are no
vehicles ahead. ●
The preceding vehicle leaves the lane when yo ur vehicle is following at a vehicle speed
at or below approximately 25 mph (40 km/h ). Otherwise, the sensor cannot properly
detect the vehicle. (“Radar Cruise Contro l Not Available No Preceding Vehicles” 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. ●
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 control:
• 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 th e system. Contact your Lexus dealer.

3174-5. Using the driving support systems
4
Driving
RX450h_RX450hL _U_OM48F85U■
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 for dynamic ra dar cruise control with full-speed range
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. 314) 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.)

6718-2. Steps to take in an emergency
8
When trouble arises
RX450h_RX450hL _U_OM48F85U■
If “Forward Camera System Unavailable” or “Forward Camera System
Unavailable Clean Windshield” is displayed
The following systems may be suspended until the problem shown in the mes-
sage is resolved. ( → P. 296)●
PCS (Pre-Collision System) ●
LKA (Lane-Keeping Assist) ●
Dynamic radar cruise control with full-speed range ●
Automatic High Beam■
If “Oil Maintenance Required Soon” is shown
Indicates that the engine oil is scheduled to be changed.
Check the engine oil, and change if necessary. After changing the engine oil,
the message should be reset. ( → P. 600)■
If “Oil Maintenance Required” is shown
Indicates that the engine oil should be changed.
Check and change the engine oil, and o il filter by your Lexus dealer. After
changing the engine oil, the message should be reset. ( → P. 600)■
If “Maintenance Required Soon” is displayed (U.S.A. only)
Indicates that all maintenance according to the driven distance on the mainte-
nance schedule
* should be performed soon.
Comes on approximately 4500 miles (7200 km) after the message has been
reset.
If necessary, perform maintenance. Plea se reset the message after the main-
tenance is performed. ( → P. 588)
* : Refer to the separate “Scheduled Mainte nance” or “Owner’s Manual Supplement”
for the maintenance interval applicable to your vehicle.

688 8-2. Steps to take in an emergency
RX450h_RX450hL _U_OM48F85UWARNING ■
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 comp act spare tire 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:
•E-Four ■
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 accid ent 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
•EPS
• Trailer Sway Control
•VDIM
• Adaptive Variable Suspension System
(if equipped)
• Dynamic radar cruise control with full-
speed range
• PCS (Pre-Collision System)
• LKA (Lane-Keeping Assist) • Automatic High Beam
• AFS (Adaptive Front-lighting System)
(if equipped)
• Tire pressure warning system
• Intuitive parking assist (if equipped)
• Intelligent Clearance Sonar (ICS) (if
equipped)
• Lexus parking assist monitor (if
equipped)
• Panoramic view monitor (if equipped)
• BSM (Blind Spot Monitor) (if
equipped)
• Navigation system (if equipped)

774 Alphabetical index
RX450h_RX450hL _U_OM48F85UChild-protectors.....................................139
Cleaning.......................................580, 584
Aluminum wheels ............................... 581
Exterior................................................... 580
Interior .................................................... 584
Seat belts ............................................... 585
Clock ................................................ 96, 548
Coat hooks.............................................. 559
Compass .................................................. 567
Condenser .............................................. 602
Console box ........................................... 534
Consumption screen ................. 105, 124
Coolant
Capacity .................................................. 715
Checking................................................. 601
Preparing and checking
before winter ................................... 390
Cooling system ...................................... 601
Hybrid system overheating ..........702
Cornering lights .................................... 259
Cruise control
Dynamic radar cruise control
with full-speed range ................... 306
Cup holders ............................................ 535
Curtain shield airbags ........................... 37
Customizable features ....................... 736
Customized mode ............................... 379 Daytime running light system.......... 260
Defogger
Outside rear view mirrors ..............516
Rear window..........................................516
Windshield..............................................516
Differential ................................................ 716
Dimensions ............................................... 710
Dinghy towing ....................................... 238
Display
Dynamic radar cruise control
with full-speed range ...................306
Energy monitor..................................... 124
LKA (Lane-Keeping Assist)......... 302
Multi-information display.................. 101
Warning messages .......................... 667
Do-it-yourself maintenance............. 593
Doors
Automatic door locking and
unlocking system..............................139
Door lock................................................ 138
Outside rear view mirrors ..............193
Power back door ................................ 142
Rear door child-p rotectors ............139
Side doors ...............................................136
Side windows ........................................196 D

775Alphabetical index
RX450h_RX450hL _U_OM48F85UDrive information .................................. 105
Drive-start control ..................... 213, 249
Driver’s seat belt reminder light ..... 662
Driver’s seat position memory ........... 181
Driving
Break-in tips ...........................................214
Correct posture.....................................30
Driving mode select switch ..........379
Hybrid vehicle driving tips............ 388
Procedures ............................................. 212
Winter drive tips ................................ 390
Driving position memory...................... 181
Memory recall function.................... 184
Power easy access system .............. 181
Dynamic radar cruise control
with full-speed range ....................... 306 E-Four ....................................................... 383
ECB (Electronically Controlled
Brake System) .................................... 382
Eco drive mode......................................379
EDR (Event data recorder).....................11
Electric motor
Location .....................................................74
Specification ........................................... 712
Electric Power Steering (EPS) ....... 383
Warning light .........................................661
Electronic key .......................................... 132
Battery-saving function ....................159
If the electronic key does not
operate properly ............................ 692
Replacing the battery ......................630
Electronically Controlled
Brake System (ECB) ....................... 382
Emergency flashers ............................ 652 E

780 Alphabetical index
RX450h_RX450hL _U_OM48F85UKeyless entry
Smart access system with
push-button start ............................. 158
Wireless remote control ....... 136, 142
Keys..............................................................132
Battery-saving function .................... 160
Electronic key ........................................132
Engine switch .......................................239
If the electronic key does not
operate properly.............................692
If you lose your keys ................ 133, 135
Key number plate ................................132
Keyless entry ..........................................132
Mechanical key .................................... 133
Power switch........................................239
Replacing the battery ...................... 630
Warning buzzer ...................................137
Wireless remote control ..................132
Knee airbags ............................................. 37 Lane-Keeping Assist (LKA) ............. 297
Language (multi-information
display) ..................................................... 113
LATCH anchors ....................................... 67
Lever
Auxiliary catch lever .........................595
Hood lock release lever.................595
Shift lever ............................................... 246
Turn signal lever ................................. 252
Wiper lever................................ 267, 272
Lexus Climate Concierge................ 506
Lexus Display Audio
controller.............................................. 402
Lexus Enform
* Lexus Enform Remote
* LEXUS Enform Safety
Connect.................................................. 571
LEXUS Enform Service
Connect................................................. 577
Lexus parking assist monitor ........... 363
Display..................................................... 364
Precautions ........................................... 370
Lexus Safety System+ ......................... 279
Automatic High Beam.................... 262
Dynamic radar cruise control
with full-speed range ................. 306
LKA (Lane-Keeping Assist) ........ 297
PCS (Pre-Collision System) ...... 286K L

782 Alphabetical index
RX450h_RX450hL _U_OM48F85UMoon roof
Door lock linked moon
roof operation ................................... 198
Jam protection function ................... 201
Operation ............................................. 200
MP3 disc.................................................. 433
Multi-information display
AWD Control display ...................... 106
Clock...........................................................96
Drive information ................................ 105
Dynamic radar cruise control
with full-speed range ................... 306
Energy monitor .....................................124
G-force display.................................... 107
Language .................................................. 113
LKA (Lane-Keeping Assist) ........ 302
Outside temperature ..........................96
PCS (Pre - Collision system) ......287
Settings .....................................................108
Suggestion function ............................. 116
Sway warning display ....................... 106
Warning messages...........................667 Navigation system
* Noise from under vehicle ........................8
Odometer .................................................. 115
Oil
Engine oil ................................................. 713
Rear differential oil .............................. 716
Opener
Fuel filler door...................................... 276
Hood........................................................595
Power back door ................................ 143
Outside rear view mirrors .................. 193
Adjusting and folding ........................193
Blind Spot Monitor (BSM) .............319
Linked mirror function
when reversing..................................194
Mirror position memory ................... 181
Outside rear view mirror
defoggers.............................................516
Outside temperature display ..............96
Overheating............................................702 N
O

784 Alphabetical index
RX450h_RX450hL _U_OM48F85URadar cruise control
(dynamic radar cruise control
with full-speed range) ..................... 306
Radiator .................................................... 602
Radio.......................................................... 426
Rear automatic air conditioning
system .................................................... 522
Rear Cross Traffic Alert ......................319
Rear Cross Traffic Auto
Brake ...................................................... 356
Rear door sunshades .......................... 557
Rear passengers’ seat belt
reminder light ..................................... 662
Rear seat
Folding down the rear
seatbacks ............................................. 168
Rear side marker lights
Light switch .......................................... 258
Replacing light bulbs ........................637
Rear turn signal lights
Replacing light bulbs ........................637
Turn signal lever ................................. 252
Wattage ....................................................719 Rear view mirror
Inside rear view mirror....................... 191
Outside rear view mirrors ..............193
Rear window defogger ........................ 516
Rear window wiper .............................. 272
Refueling................................................... 274
Capacity................................................... 712
Fuel types................................................. 712
Opening the fuel tank cap .............274
When the fuel filler door
cannot be opened ..........................277
Regenerative braking............................. 76
Remote Touch
* .................................... 500
Replacing
Electronic key battery .....................630
Fuses ........................................................ 632
Light bulbs............................................. 637
Tires .......................................................... 673
Windshield wiper inserts ............... 628
Reporting safety defects
for U.S. owners ...................................752
Resetting the message indicating
maintenance is required ................ 588
Rev indicator ............................................. 98
Rev peak ..................................................... 98
Road accident cautions .......................... 81R