2018 LEXUS RX450h warning light

4055-1. Basic Operations
5
Lexus Display Audio system
RX450h_RX450hL _U_OM48F85U■
When using the screen ●
Under extremely cold conditions, the Lexus Display Audio controller may react slowly.●
If the screen is cold, the display may be da rk, or the system may seem to be operating
slightly slower than normal. ●
The screen may seem dark and hard to see when viewed through sunglasses. Change
your angle of viewing, adjust the display on the “D isplay” screen ( → P. 417) or remove
your sunglasses. ■
Using cellular phones
Interference may be heard through the audi o system’s speakers if a cellular phone is
being used inside or close to the vehicle while the audio system is operating.
WARNING ■
Using the Lexus Display Audio controller
Be careful when touching the Lexus Display Audio controller in extreme temperatures
as it may become very hot or cold due to the temperature inside the vehicle. ■
Laser product ●
CAUTION
USE OF CONTROL OR ADJUSTMENT OR PERFORMANCE OF PROCE-
DURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARD-
OUS RADIATION EXPOSURE. ●
CAUTION
THE USE OF OPTICAL INSTRUMENTS WITH THIS PRODUCT WILL
INCREASE EYE HAZARD.
NOTICE ■
To prevent Lexus Display Au dio controller malfunction●
Do not allow the Lexus Display Audio controll er to come into contact with food, liq-
uid, stickers or lit cigarettes as doing so may cause it to change color, emit a strange
odor or stop functioning. ●
Do not subject the Lexus Display Audio cont roller to excessive pressure or strong
impact as the controller may bend or break off.■
To prevent battery discharge
Do not leave the audio system on longer than necessary when the engine is off. ■
To avoid damaging the audio system
Take care not to spill drinks or other fluids on the audio system.

5336-4. Using the storage features
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Interior features
RX450h_RX450hL _U_OM48F85U 
RX450hL
Glove box ( → P. 534)
Auxiliary boxes (if equipped)
( → P. 539)
Door pockets ( → P. 537)
Bottle holders ( → P. 537) Console box ( → P. 534)
Cup holders ( → P. 535)
Coin box ( → P. 538)
WARNING ●
Do not leave glasses, lighters or spray cans in the storage spaces, as this may cause
the following when cabin temperature becomes high:
• Glasses may be deformed by heat or cracke d if they come into contact with other
stored items.
• Lighters or spray cans may explode. If they come into contact with other stored
items, the lighter may catch fire or the spray can may release gas, causing a fire
hazard. ●
When driving or when the storage compartments are not in use, keep the lids closed.
In the event of sudden braking or sudden swerving, an accident may occur due to an
occupant being struck by an open lid or the items stored inside.1
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5576-5. Using the other interior features
6
Interior features
RX450h_RX450hL _U_OM48F85UUse the front passenger footwell hooks
to help support and prevent objects
placed on the floor, such as a grocery
bag, from overturning.
Pull the sunshade up using the tab and
hook the sunshade on to the anchors. To lower the sunshade, pull it up slightly
using the tab, unhook it from the
anchors, and lower it slowly.Front passenger footwell hooks
NOTICE
To prevent the hooks from being damaged, do not hang anything from a hook or apply
excessive force to it.
Rear door sunshades (if equipped)
WARNING
When a rear door sunshade is in use, do not put fingers, etc. on the anchors or in the
groove of the rear door suns hade. Otherwise, a finger, etc. may get caught, possibly
causing an injury.
NOTICE ●
Do not put anything in an area where it may interfere with the operation of a rear
door sunshade. ●
To prevent damage to the rear door sunshades, do not apply excessive load or attach
items to the rear door sunshades.

594 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85U* : Vehicles with sing le-beam headlightsWasher fluid
( → P. 604) • 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 ●
Make sure that the “ACCESSORY” or “I GNITION ON” on the multi-information
display and the “READY” indicator are both off. ●
Keep hands, clothing and tools away from the moving fan and engine drive belt.●
Be careful not to touch the engine, power co ntrol unit, 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. Fuel fumes are flamma-
ble. ■
When working near the electric cooling fans or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fans may automatically start to
run if the air conditioning is on and/ or the coolant temperature is high. ( → P. 602)■
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

5957-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85UPull the hood lock release lever. The hood will pop up slightly.
Pull up the auxiliary catch lever and
lift the hood.Hood Release the lock from the inside of the vehicle to open the hood.1
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WARNING ■
Pre-driving check
Check that the hood is fully closed and locked.
If the hood is not locked properly, it may op en while the vehicle is in motion and cause
an accident, which may result in death or serious injury.

6037-3. Do-it-yourself maintenance
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Maintenance and care
RX450h_RX450hL _U_OM48F85U■
Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN” lines
on the tank.
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Adding fluid
Make sure to check the fluid type and prepare the necessary item. ■
Brake fluid can absorb moisture from the air
Excess moisture in the brake fluid can cause a dangerous loss of braking efficiency. Use
only newly opened brake fluid.Brake fluid
Fluid type FMVSS No.116 DOT 3 or SAE J1703 brake fluid
Items Clean funnel
WARNING ■
When filling the reservoir
Take care as brake fluid can harm your hands and eyes and damage painted surfaces.
If fluid gets on your hands or in your ey es, flush the affected area with clean water
immediately.
If you still experience di scomfort, see a doctor.
NOTICE ■
If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads wear out or
when the fluid level in the accumulator is high.
If the reservoir needs frequent ref illing, there may be a serious problem.

6097-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85U■
Before recharging
When recharging, the 12-volt battery produc es hydrogen gas which is flammable and
explosive. Therefore, observe the following precautions before recharging: ●
If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect the
ground cable. ●
Make sure the power switch on the charge r is off when connecting and disconnecting
the charger cables to the 12-volt battery. ■
After recharging/reconnecting the 12-volt battery ●
The hybrid system may not start. Follow the procedure below to initialize the system.
Shift the shift lever to P.
Open and close any of the doors.
Restart the hybrid system. ●
Unlocking the doors using the smart access system with push-button start may not be
possible immediately after reconnecting the 12-volt battery. If this happens, use the
wireless remote control or the mechan ical key to lock/unlock the doors.●
Start the hybrid system with the power sw itch in ACCESSORY mo de. The hybrid sys-
tem may not start with the power switch turned off. However, the hybrid system will
operate normally from the second attempt.●
The power switch mode is recorded by the vehicle. If the 12-volt battery is reconnected,
the vehicle will return the power switch mode to the status it was in before the 12-volt
battery was disconnected. Make sure to turn off the power before disconnect the 12-
volt battery. Take extra care when connec ting the 12-volt battery if the power switch
mode prior to discharge is unknown.
If the system will not start even after multip le attempts at all methods above, contact your
Lexus dealer.
WARNING ■
Chemicals in the 12-volt battery
The 12-volt battery contains poisonous and corrosive sulfuric acid and may produce
hydrogen gas which is flammable and explosive. To reduce the risk of death or serious
injury, take the following precautions while working on or near the 12-volt battery:●
Do not cause sparks by touching the 12-volt battery terminals with tools. ●
Do not smoke or light a matc h near the 12-volt battery.●
Avoid contact with eyes, skin and clothes. ●
Never inhale or swallow electrolyte. ●
Wear protective safety glasses when working near the 12-volt battery. ●
Keep children away from the 12-volt battery. ■
Where to safely charge the 12-volt battery
Always charge the 12-volt battery in an open area. Do not charge the 12-volt battery in
a garage or closed room where th ere is insufficient ventilation.■
How to recharge the 12-volt battery
Only perform a slow charge (5 A or less). The 12-volt battery may explode if charged
at a quicker rate. 1
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612 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UYour vehicle is equipped with a tire pressure warning system that uses tire pres-
sure warning valves and transmitters to detect low tire inflation pressure before
serious problems arise.
◆ Installing tire pressure warning valves and transmitters
When replacing tires or wheels, tire pr essure warning valv es and transmitters
must also be installed.
When new tire pressure wa rning valves and transmitters are installed, new ID
codes must be registered in the tire pressure warning computer and the tire
pressure warning system must be initia lized. Have tire pressure warning valve
and transmitter ID codes registered by your Lexus dealer. ( → P. 613)
◆ Initializing the tire pressure warning system ■
The tire pressure warning system must be initialized in the following circum-
stances: ●
When the tire inflation pressure is changed such as when changing travel-
ing speed. ●
When the tire inflation pressure is changed such as when the tire size is
changed. ●
When rotating the tires
When the tire pressure warning system is initialized, the current tire inflation
pressure is set as the benchmark pressure.Tire pressure warning system ●
The tire pressure detected by the tire
pressure warning system can be dis-
played on the multi-information display. The illustration used is intended as an exam-
ple, and may differ from the image that is
actually displayed on the multi-information
display.●
If the tire pressure drops below a prede-
termined level, the driver is warned by a
screen display and a warning light.
( → P. 662) The illustration used is intended as an exam-
ple, and may differ from the image that is
actually displayed on the multi-information
display.