cruise control LEXUS RX450H 2020 Owner's Manual

3084-5. Using the driving support systems
RX350/RX350L_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 pedal
Approach warning (vehicle-to-vehicle distance control mode)

3094-5. Using the driving support systems
4
Driving
RX350/RX350L_U
When constant speed control mode is selected, 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. 305
Canceling and resuming the speed setting: P. 307
Selecting constant speed control mode
1
2

3104-5. Using the driving support systems
RX350/RX350L_U
■Dynamic radar cruise control with full-speed range can be set when
●The shift lever is in the D or range 4 or higher of S has been selected.
(vehicles without paddle shift switches)
●The shift lever is in D.
(vehicles with padd le shift switches)
●Range 4 or higher of D has been selected by using the paddle shift switch.
(vehicles with paddle 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.

3114-5. Using the driving support systems
4
Driving
RX350/RX350L_U
■Automatic cancelation of constant 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 radar 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 warning 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. 308) 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.)

6648-2. Steps to take in an emergency
RX350/RX350L_U
■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. 290)
●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. 597)
■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. 597)
■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. 585)
*: Refer to the separate “Scheduled Mainte nance” or “Owner’s Manual Supplement”
for the maintenance interval applicable to your vehicle.

6808-2. Steps to take in an emergency
RX350/RX350L_U
WARNING
■When using the compact spare tire
●Remember that the compact spare tire provided 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 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:
• AWD system (AWD models)
■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
• Trailer Sway Control
•EPS
• VDIM (if equipped)
• 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)

760Alphabetical index
RX350/RX350L_U
Child-protectors..................................... 127
Cleaning......................................... 576, 581 Aluminum wheels .............................. 577
Exterior....................................................576
Interior ...................................................... 581
Seat belts ............................................... 582
Clock .................................................86, 544
Coat hooks.............................................. 556
Compass .................................................. 564
Condenser .............................................. 599
Console box ...........................................530
Consumption screen ..................... 94, 114 Coolant
Capacity................................................. 702
Checking .............................................. 598
Preparing and checking before winter ....................................384
Cooling system ..................................... 598 Engine overheating .......................... 692
Cornering lights.................................... 253
Cruise control Dynamic radar cruise control with full-speed range .................. 300
Cup holders.............................................. 531
Curtain shield airbags ............................ 37
Customizable features ....................... 722
Customized mode................................373

761Alphabetical index
RX350/RX350L_U
Daytime running light system .......... 254
DefoggerOutside rear view mirrors .............. 513
Rear window ......................................... 513
Windshield ............................................. 513
Differential ............................................... 703
Dimensions ............................................. 698
Dinghy towing........................................ 230
Display Dynamic radar cruise control with full-speed range ................... 300
LKA (Lane-Keeping Assist) .........296
Multi-information display ..................90
Warning messages............................ 661
Do-it-yourself maintenance .............590
Doors Automatic door locking and unlocking system .............................. 127
Door lock ................................................ 126
Outside rear view mirrors .............. 184
Power back door ................................ 130
Rear door child-p rotectors ............ 127
Side doors ...............................................124
Side windows ........................................ 187 Drive information .....................................94
Drive-start control ........ 203, 238, 243
Driver’s seat belt
reminder light .... 656
Driver’s seat position memory.......... 172
Driving Break-in tips ......................................... 204
Correct posture .................................... 30
Driving mode select switch .......... 373
Procedures ........................................... 202
Winter drive tips ................................384
Driving position memory .................... 172 Memory recall function .................... 175
Power easy access system ............. 172
Dynamic radar cruise control with full-speed range....................... 300
Dynamic Torque Control AWD system .....................................................379
D

766Alphabetical index
RX350/RX350L_U
Lane-Keeping Assist (LKA)...............291
Language (multi-information display).................................................... 102
LATCH anchors .......................................67
Lever Auxiliary catch lever .........................592
Hood lock release lever .................592
Shift lever ................................... 236, 240
Turn signal lever .................................246
Wiper lever .................................261, 267
Lexus Climate Concierge ................ 502
Lexus Display Audio controller...... 396
Lexus Enform
*
Lexus Enform Remote*.................... 573
LEXUS Enform Safety Connect ................................................ 568
LEXUS Enform Service
Connect
*............................................. 574
Lexus parking assist monitor ........... 357 Display .................................................... 358
Precautions ...........................................364
Lexus Safety System+..........................274 Automatic High Beam ....................256
Dynamic radar cruise control with full-speed range ................... 300
LKA (Lane-Keeping Assist) .......... 291
PCS (Pre-Collision System) ......... 281 License plate lights
Light switch........................................... 252
Replacing light bulbs .......................630
Light Automatic High Beam.................... 256
Cornering lights ................................. 253
Fog light switch ................................... 260
Headlight switch ................................ 252
Illuminated entry system................. 527
Interior light list .................................... 524
Interior lights ........................................ 525
Luggage compartment light ..........136
Personal lights ..................................... 526
Replacing light bulbs .......................630
Turn signal lever ................................. 246
Vanity lights .......................................... 543
Wattage ................................................. 705
Welcome lighting.............................. 255
Light bulbs Replacing ...............................................630
Wattage ................................................. 705
LKA (Lane-Keeping Assist) .............. 291
Lock steering column......................... 233
Luggage cover .......................................537
L

767Alphabetical index
RX350/RX350L_U
MaintenanceDo-it-yourself maintenance......... 590
General maintenance .................... 586
Maintenance data ............................. 698
Maintenance requirements.......... 584
Malfunction indicator lamp .............. 654
Memory recall function .......................175
Meter Head-up display..................................108
Indicators.................................................. 80
Instrument panel light control ........ 88
Meters.........................................................86
Multi-information display ..................90
Settings ....................................................... 97
Warning lights .................................... 654
Warning messages............................ 661
Microphone ............................................ 456
Mirrors Inside rear view mirror ..................... 182
Outside rear view mirror defoggers ............................................ 513
Outside rear view mirrors .............. 184
Vanity mirrors ......................................543
Moon roof Door lock linked moon roof operation ............................................. 189
Jam protection function ................... 192
Operation ................................................. 191 MP3 disc .................................................. 427
Multi-information display
AWD Control display........................ 95
Clock .......................................................... 86
Drive information.................................. 94
Dynamic radar cruise control with full-speed range .................. 300
G-force display ..................................... 96
Language.................................................102
LKA (Lane-Keeping Assist)......... 296
Outside temperature.......................... 86
PCS (Pre-Collision System) .................281
Settings .......................................................97
Suggestion function........................... 105
Sway warning display......................... 95
Warning messages ............................661
Navigation system
*
Noise from under vehicle ........................8
M
N
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.