air condition LEXUS RX350 2019 Service Manual

5216-2. Using the air conditioning system and defogger
6
Interior features
RX350/RX350L_UHeated steering wheel 
/seat heaters 
/seat ventila-
tors 
 : If equippedHeated steering wheel and seat heaters heat the side grips of the steering
wheel and seats, respectively. Seat vent ilators maintain good ventilation using
a fan built into the seats. WARNING ●
Care should be taken to prevent injury if anyone in the following categories comes in
contact with the steering wheel and seats when the heater is on:
• Babies, small children, the elderly, the sick and the ph ysically challenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold
remedies, etc.) ●
Observe the following precautions to prevent minor burns or overheating:
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use seat heater more than necessary.
NOTICE ●
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat. ●
To prevent battery discharge, do not us e the functions when the engine is off.

522 6-2. Using the air conditio ning system and defogger
RX350/RX350L_U Turns the heated steering wheel on/off The indicator light comes on when the
heated steering wheel is operating. ■
Operation condition
The heated steering wheel can be used when the engine switch is in IGNITION ON
mode. ■
Timer
The heated steering wheel will automati cally turn off after about 30 minutes.
When any switch is pressed, the system is set to automatic mode and the
“AUTO” indicator (green) lights up.
Each time the switch is pressed, the
operation cond ition changes as follows.
Hi (3 segments lit)  Mid (2 segments
lit)  Lo (1 segment lit)  OffThe level indicator (amber) lights up
during operation.
■
Operation condition
The front seat heaters can be used when the engine switch is in IGNITION ON mode. ■
When the air conditioning system is operating in S-FLOW mode
If a passenger is not detected in the front pa ssenger seat, the seat he ater of the front pas-
senger’s seat will be turned off if on. (  P. 511)■
Customization
Some functions can be customized. (  P. 722)Heated steering wheel
Front seat heaters
Level
indicator“AUTO”
indicator

5236-2. Using the air conditioning system and defogger
6
Interior features
RX350/RX350L_U Each time the switch is pressed, the operation condition changes as follows. Hi
(3 segments lit)  Mid (2 segments lit)  Lo (1 segment lit)  OffThe level indicator (amber) lights up during operation.■
Operation condition
The second-row seat heaters can be used when the engine switch is in IGNITION ON
mode.
When any switch is pressed, the system
is set to automatic mode and the
“AUTO” indicator (green) lights up.
Each time the switch is pressed, the
operation cond ition changes as follows.
Hi (3 segments lit)  Mid (2 segments
lit)  Lo (1 segment lit)  OffThe level indicator (green) lights up
during operation. ■
Operation condition
The seat ventilators can be used when the engine switch is in IGNITION ON mode.■
When the air conditioning system is operating in S-FLOW mode
If a passenger is not detected in the front passenger seat, the seat ventilator of the front
passenger’s seat will be turned off if on. (  P. 511)■
Customization
Some functions can be customized. (  P. 722)Second-row seat heaters 
Type A 
Type BLevel indicator
Level indicator
Seat ventilators Level
indicator“AUTO”
indicator

550 6-5. Using the other interior features
RX350/RX350L_U NOTICE ■
Conditions in which the wireless charger may not operate correctly
In the following situations, the wire less charger may not operate correctly:●
When a portable device is fully charged ●
When there is a foreign object between the charging area and portable device●
When a portable device becomes hot while charging●
When a portable device is placed on the wireless area with its charging surface fac-
ing up ●
When a portable device is not centered on the charging area ●
When the vehicle is near a TV tower, electric power plant, gas station, radio station,
large display, airport or other facility that generates stro ng radio waves or electrical
noise ●
When the portable device is in contact with, or is covered by any of the following
metallic objects:
• Cards to which aluminum foil is attached
• Cigarette boxes that ha ve aluminum foil inside
• Metallic wallets or bags
•Coins
•Metal hand warmers
• Media such as CDs and DVDs ●
When wireless keys (that emit radio waves) other than those of your vehicle are being
used nearby.
If in situations other than above the wirele ss charger does not operate properly or the
operation indicator light is blinking, the wireless charge r may be malfunctioning. Con-
tact your Lexus dealer. ■
To prevent failure or damage to data ●
Do not bring magnetic cards, such as a cr edit card, or magnetic recording media,
close to the wireless charger while charging. Otherwise, data may be erased due to
the influence of magnetism.
Additionally, do not bring pr ecision instruments such as wrist watches, close to the
wireless charger, as such objects may malfunction. ●
Do not leave portable devices in the cab in. The temperature inside the cabin may
become high when parked in the sun, and cause damage to the device. ■
To prevent battery discharge
Do not use the wireless charger for a long pe riod of time with the engine is stopped.

5716-5. Using the other interior features
6
Interior features
RX350/RX350L_U ■
Automatic Collision Notification
In case of either airbag deployment or severe rear-end collision, the system is
designed to automatically call the re sponse center. The responding agent
receives the vehicle’s location and attempts to speak with the vehicle occu-
pants to assess the level of emergency. If the occupants are unable to commu-
nicate, the agent automatically treats the call as an emergency, contacts the
nearest emergency services provider to describe the situation, and requests
that assistance be sent to the location. ■
Stolen Vehicle Location
If your vehicle is stolen, Safety Conn ect can work with local authorities to
assist them in locating and recovering the vehicle. After filing a police report,
call the Safety Connect response center at 1-800-25-LEXUS
(1-800-255-3987) and follow the prompts for Safety Connect to initiate this
service.
In addition to assisting law enforcemen t with recovery of a stolen vehicle,
Safety-Connect-equipped vehicle locatio n data may, under certain circum-
stances, be shared with third parties to locate your vehicle. Further informa-
tion is available at Lexus.com. ■
Emergency Assistance Button (“SOS”)
In the event of an emergency on the ro ad, push the “SOS” button to reach the
Safety Connect response center. Th e answering agent will determine your
vehicle’s location, assess the emergency, and dispatch the necessary assis-
tance required. If you accidentally press the “SOS” button, tell the response-center agent that you
are not experiencing an emergency.■
Enhanced Roadside Assistance
Enhanced Roadside Assistance adds GP S data to the already included war-
ranty-based Lexus roadside service.
Subscribers can press the “SOS” button to reach a Safety Connect response-
center agent, who can help with a wide range of needs, such as: towing, flat
tire, fuel delivery, etc. For a descript ion of the Roadside Assistance services
and their limitations, please see the Safety Connect Terms and Conditions,
which are available at Lexus.com.Safety Connect services

575
7Maintenance and care
RX350/RX350L_U 7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ................ 576
Cleaning and protecting
the vehicle interior................... 581
7-2. Maintenance
Maintenance
requirements ............................584
General maintenance..............586
Emission inspection and
maintenance (I/M)
programs ....................................589
7-3. Do-it-yourself
maintenance
Do-it-yourself service
precautions................................590
Hood ............................................... 592
Positioning a floor jack ............593
Engine compartment ............... 594
Tires .................................................604
Tire inflation pressure................ 613
Wheels ............................................ 616
Air conditioning filter ................ 618
Windshield wiper inserts ..........621
Electronic key battery .............. 623
Checking and replacing
fuses .............................................. 625
Headlight aim .............................. 628
Light bulbs.....................................630

5917-3. Do-it-yourself maintenance
7
Maintenance and care
RX350/RX350L_U * : Vehicles with single-beam headlightsTire inflation pres-
sure (  P. 613) • Tire pressure gauge • Compressed air source
Washer fluid
(  P. 603) • Water or washer fluid containing antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)
WARNING
The engine compartment contains many mechan isms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions. ■
When working on the engine compartment ●
Keep hands, clothing and tools away from the moving fan and engine drive belt.●
Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other fluids may also be hot. ●
Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment. ●
Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel and
battery fumes are flammable. ●
Be extremely cautions when working on the battery. It contains poisonous and corro-
sive sulfuric acid. ■
When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 599) ■
Safety glasses
Wear safety glasses to prevent flying or falling material, flui d spray, etc. from getting in
your eyes.
NOTICE ■
If you remove the air cleaner filter
Driving with the air cleaner f ilter removed may cause excessive engine wear due to dirt
in the air. Items Parts and tools

6097-3. Do-it-yourself maintenance
7
Maintenance and care
RX350/RX350L_U ■
Situations in which the tire pressure warning system may not operate properly ●
In the following cases, the tire pressure warning system may not operate properly.
• If non-genuine Lexus wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equipment) tire.
• A tire has been replaced with a tire that is not of the specified size.
• Tire chains, etc. are equipped.
• If a window tint that affects th e radio wave signals is installed.
• If there is a lot of snow or ice on the vehi cle, particularly around the wheels or wheel
housings.
• If the tire inflation pressure is extr emely higher than the specified level.
• If wheel without the tire pressure warning valve and transmitter is used.
• If the ID code on the tire pressure warning valves and transmitters is not registered
in the tire pressure warning computer. ●
Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large display, air-
port or other facility that generates st rong radio waves or electrical noise.
• When carrying a portable radio, cellular phone, cordless phon e or other wireless
communication device.
If tire position information is not correctly displayed due to the radio wave conditions,
the display may be corrected by driving and changing the radio wave conditions. ●
When the vehicle is parked, the time taken for the warning to start or go off could be
extended. ●
When tire inflation pressure declines rapidly for example when a tire has burst, the
warning may not function. ■
The initialization operation ●
Make sure to carry out initialization afte r adjusting the tire inflation pressure.
Also, make sure the tires are cold before carryi ng out initialization or tire inflation pres-
sure adjustment. ●
If you have accidentally turned the engine swit ch off during initialization, it is not neces-
sary to press the reset switch again as initialization will re start automatically when the
engine switch has been turned to IG NITION ON mode for the next time.●
If you accidentally press the re set switch when initialization is not necessary, adjust the
tire inflation pressure to the specified leve l when the tires are co ld, and conduct initial-
ization again. ●
While the position of each tire is being de termined and the inflation pressures are not
being displayed on the multi-info rmation display, if the inflat ion pressure of a tire drops,
the tire pressure warning light will come on.

612 7-3. Do-it-yourself maintenance
RX350/RX350L_U WARNING ■
When inspecting or replacing tires
Observe the following precautions to prevent accidents.
Failure to do so may cause damage to parts of the drive train as well as dangerous han-
dling characteristics, which may lead to an accident resu lting in death or serious injury.●
Do not mix tires of different makes, models or tread patterns.
Also, do not mix tires of remarkably different treadwear. ●
Do not use tire sizes other than those recommended by Lexus. ●
Do not mix differently constructed tires (radial, bias-belted or bias-ply tires). ●
Do not mix summer, all season and snow tires. ●
Do not use tires that have be en used on another vehicle.
Do not use tires if you do not know how they were used previously. ●
Do not tow if your vehicle has a compact spare tire installed. ■
When initializing the tire pressure warning system
Do not initializing tire inflatio n pressure without first adjusting the tire inflation pressure
to the specified level. Otherwise, the tire pressure warning light may not come on even
if the tire inflation pressure is low, or it may come on when the tire inflation pressure is
actually normal.
NOTICE ■
Repairing or replacing tires, wheels, tire pressure warning valv es, transmitters and
tire valve caps ●
When removing or fitting the wheels, tires or the tire pressure warning valves and
transmitters, contact your Lexus dealer as the tire pressure warning valves and trans-
mitters may be damaged if not handled correctly. ●
Make sure to install the tire valve caps. If the tire valve caps ar e not installed, water
could enter the tire pressure warning valves and the tire pressure warning valves
could be bound. ●
When replacing tire valve caps, do not use tire valve caps other than those specified.
The cap may become stuck. ■
To avoid damage to the tire pressu re warning valves and transmitters
When a tire is repaired with liquid sealants, the tire pressure warning valve and trans-
mitter may not operate properly. If a liquid sealant is used, contact your Lexus dealer or
other qualified service shop as soon as possi ble. Make sure to replace the tire pressure
warning valve and transmitter when replacing the tire. (  P. 605)■
Driving on rough roads
Take particular care when driving on roads with loose surfaces or potholes.
These conditions may cause lo sses in tire inflation pre ssure, reducing the cushioning
ability of the tires. In addition, driving on rough roads may cause damage to the tires
themselves, as well as the vehicle’s wheels and body. ■
If tire inflation pressure of ea ch tire becomes low while driving
Do not continue driving, or your tires and/or wheels may be ruined.

6157-3. Do-it-yourself maintenance
7
Maintenance and care
RX350/RX350L_U ■
Instructions for checking tire inflation pressure
When checking tire in flation pressure, ob serve the following:●
Check only when the tires are cold.
If your vehicle has been parked for at least 3 hours or has not been driven for more than
1 mile or 1.5 km, you will get an accurate cold tire inflation pressure reading. ●
Always use a tire pressure gauge.
It is difficult to judge if a tire is properly inflated based only on its appearance. ●
It is normal for the tire inflat ion pressure to be higher after driving as heat is generated
in the tire. Do not reduce tire inflation pressure after driving.●
Never exceed the vehicle capacity weight.
Passengers and luggage weight should be placed so that the vehicle is balanced.
WARNING ■
Proper inflation is critical to save tire performance
Keep your tires properly inflated.
If the tires are not properly inflated, the following conditions may occur which could
lead to an accident resultin g in death or serious injury:●
Excessive wear ●
Uneven wear ●
Poor handling ●
Possibility of blowouts resu lting from overheated tires●
Air leaking from between tire and wheel ●
Wheel deformation and/or tire damage ●
Greater possibility of tire damage while driving (due to road hazards, expansion
joints, sharp edges on the road, etc.)
NOTICE ■
When inspecting and adjust ing tire inflation pressure
Be sure to put the tire valve caps back on.
If a valve cap is not installed, dirt or moisture may get into the valve and cause an air
leak, resulting in decreased tire inflation pressure.