2018 LEXUS NX300h light

324 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6-3.Do-it-yourself maintenance
Do-it-yourself service pre-
cautions If you perform maintenance by
yourself, be sure to follow the cor-
rect procedure as given in these
sections.
Maintenance Items Parts and tools
12-volt Bat-
tery condition
( → P.333) •Grease
•Conventional wrench
(for terminal clamp
bolts)
Brake fluid
level
( → P.332) • FMVSS No.116 DOT 3
or SAE J1703 brake
fluid
• Rag or paper towel
• Funnel (used only for
adding brake fluid)
Engine/power
control unit
coolant level
( → P.330) • “Toyota Super Long Life
Coolant” or a similar
high quality ethylene gly-
col-based non-silicate,
non-amine, non-nitrite
and non-borate coolant
with long-life hybrid
organic acid technology
For the U.S.A.:
“Toyota Super Long Life
Coolant” is pre-mixed
with 50% coolant and
50% deionized water.
For Canada:
“Toyota Super Long Life
Coolant” is pre-mixed
with 55% coolant and
45% deionized water.
• Funnel (used only for
adding coolant) Engine oil
level
( → P.328) •“Toyota Genuine Motor
Oil” or equivalent
• Rag or paper towel
• Funnel (used only for
adding engine oil)
Fuses
( → P.349) • Fuse with same amper-
age rating as original
Light bulbs
( → P.353) •Bulb with same number
and wattage rating as
original
Headlight aim • Phillips-head screw-
driver
Radiator and
condenser
( → P.331) —
Tire inflation
pressure
( → P.343) • Tire pressure gauge
• Compressed air source
Washer fluid
( → P.332) • Water or washer fluid
containing antifreeze
(for winter use)
• Funnel (used only for
adding water or washer
fluid)
WARNING
The engine compartment contains many
mechanisms and fluids that may move
suddenly, become hot, or become elec-
trically energized. To avoid death or seri-
ous injury, observe the following
precautions.
■
When working on the engine com-
partment
●
Make sure that the indicator on the
power switch and the “READY” indi-
cator are both off.
●
Keep hands, clothing and tools away
from the moving fan and engine drive
belt. Items Parts and tools

3256-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care 1 Pull the hood lock release lever. The hood will pop up slightly.
2 Pull up the auxiliary catch lever and
lift the hood.WARNING●
Be careful not to touch the engine,
power control 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
flammable.■
When working near the electric cool-
ing fans or radiator grille
Be sure the power switch is off.
With 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.331)■
Safety glasses
Wear safety glasses to prevent flying or
falling material, fluid spray, etc. from get-
ting in your eyes.
NOTICE■
If you remove the air cleaner filter
Driving with the air cleaner filter
removed may cause excessive engine
wear due to dirt in the air. Hood
Opening the hood
WARNING
■
Pre-driving check
Check that the hood is fully closed and
locked.
If the hood is not locked properly, it may
open while the vehicle is in motion and
cause an accident, which may result in
death or serious injury.

332 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U ■
Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN” lines
on the tank.
■
Adding fluid
Make sure to check the fluid type and
prepare the necessary item.
 Fluid type FMVSS No.116 DOT 3 or SAE J1703;
FMVSS No.116 DOT 4 or SAE J1704
brake fluid
 Items Clean funnel
■
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.
If none of the washer do not work or
the “Windshield Washer Fluid Low” on
the multi-information display, the
washer tank may be empty. Add
washer fluid.WARNING■
When the electric cooling fans are
operating
Do not touch the engine compartment.
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.
Be sure the power switch is off when
working near the electric cooling fans or
radiator grille.
Checking and adding the brake
fluid WARNING■
When filling the reservoir
Take care as brake fluid can harm your
hands and eyes and damage painted sur-
faces.
If fluid gets on your hands or in your eyes,
flush the affected area with clean water
immediately.
If you still experience discomfort, 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 leve l in the accumulator
is high.
If the reservoir need s frequent refilling,
there may be a serious problem.
Checking and adding the washer
fluid

334 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U hybrid system 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 recon-
nected, 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 connecting the 12-volt battery
if the power switch mode prior to dis-
charge is unknown.
If the system will not st art even after multiple
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 pro-
duce hydrogen gas which is flammable
and explosive. To reduce the risk of death
or serious injury, take the following pre-
cautions 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 match 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 bat-
tery in a garage or closed room where
there is insuffic ient ventilation. ■
Emergency measures regarding
electrolyte ●
If electrolyte gets in your eyes
Flush your eyes with clean water for at
least 15 minutes and get immediate
medical attention. If possible, continue
to apply water with a sponge or cloth
while traveling to the nearest medical
facility. ●
If electrolyte gets on your skin
Wash the affected area thoroughly. If
you feel pain or burning, get medical
attention immediately. ●
If electrolyte gets on your clothes
It can soak through clothing on to your
skin. Immediately take off the clothing
and follow the procedure above if nec-
essary. ●
If you accidentally swallow electrolyte
Drink a large quantity of water or milk.
Get emergency medical attention
immediately. ■
When handling the 12-volt battery
→ P.393 ■
When disconnecting the 12-volt bat-
tery
Do not disconnect the negative (-) termi-
nal on the body side as shown. The dis-
connected negative (-) terminal may
touch the positive (+) terminal, which
may cause a short and result in death or
serious injury.

338 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U Front ■
Routine tire inflation pressure checks
The tire pressure warning system does not
replace routine tire inflation pressure
checks. Make sure to check tire inflation
pressure as part of your routine of daily
vehicle checks.
Your vehicle is equipped with a tire
pressure warning system that uses tire pressure warning valves and transmit-
ters to detect low ti re inflation pressure
before serious problems arise.
 If the tire pressure drops below a
predetermined level, the driver is
warned by a warning light.
( → P.370)
 The tire pressure detected by the
tire pressure warning system can be
displayed on the multi-information
display.
■
Certification for tire pressure warning system
For vehicles sold in the U.S.A.
Tire pressure warning system A

3416-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care pressure warning valves and transmit-
ters must also be installed.
When new tire pressure warning
valves and transmitte rs are installed,
new ID codes must be registered in the
tire pressure warning computer and
the tire pressure warning system must
be initialized. Have tire pressure warn-
ing valve and transmitter ID codes reg-
istered by your Lexus dealer.
( → P.343) ■
When replacing the tires and wheels
If the ID code of the tire pressure warning
valve and transmitter is not registered, the
tire pressure warning system will not work
properly. After driving for about 20 min-
utes, the tire pressure warning light blinks
for 1 minute and stays on to indicate a sys-
tem malfunction. ■
The tire pressure warning system
must be initialized in the following
circumstances:
 When adjusting the tire inflation
pressure
 When the tire inflation pressure is
changed such as when changing
traveling speed.
 When rotating the tires
 When changing the tire.
When the tire pressure warning system
is initialized, the current tire inflation
pressure is set as the benchmark pres-
sure. ■
How to initialize the tire pressure
warning system
1 Park the vehicle in a safe place and
turn the power switch off. Initialization cannot be performed while
the vehicle is moving.
2 Adjust the tire inflation pressure to
the specified cold tire inflation pres-
sure level.
Make sure to adjust the tire pressure to the NOTICE■
Repairing or replacing tires, wheels,
tire pressure warning valves, trans-
mitters 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 warn-
ing valves and transmitters may be
damaged if not handled correctly.
●
Make sure to install the tire valve caps.
If the tire valve caps are 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 pressure
warning valves and transmitters
When a tire is repaired with liquid seal-
ants, the tire pressure warning valve and
transmitter may not operate properly. If a
liquid sealant is used , contact your Lexus
dealer or other qualified service shop as
soon as possible. After use of liquid seal-
ant, make sure to re place the tire pres-
sure warning valve and transmitter when
repairing or replacing the tire. ( → P.338,
345)
Initializing the tire pressure
warning system

342 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U specified cold tire infl ation pressure level.
The tire pressure warning system will oper-
ate based on this pressure level.
3 Turn the power switch to ON
mode.
4 Press or of the meter con-
trol switches and select .
5 Press or of the meter con-
trol switches, select the “Vehicle
Settings” and then press .
6 Press or of the meter con-
trol switches, select the “TPMS”
and then press and hold the .The “Tire Pressure Re calibrating. Please
Wait Until Complete” will be displayed on
the multi-information display and the tire
pressure warning light will blink slowly 3
times.
When the message disappears, initializa-
tion is complete.
■
Initializing the tire pressure warning sys-
tem
Initialize the system with the tire inflation
pressure adjusted to the specified level.
■
The initialization operation
●
Make sure to carry ou t initialization after
adjusting the tire inflation pressure.
Also, make sure the tires are cold before
carrying out initializat ion or tire inflation
pressure adjustment.
●
If you have accidenta lly turned the power
switch off during initialization, it is not necessary to press the reset switch again
as initialization will restart automatically
when the power switch has been turned
to ON mode for the next time. ●
If you accidentally press the reset switch
when initialization is not necessary, adjust
the tire inflation pressure to the specified
level when the tires are cold, and conduct
initialization again. ■
Warning performance of the tire pres-
sure warning system
The warning of the tire pressure warning
system will change in accordance with the
conditions under which it was initialized. For
this reason, the system may give a warning
even if the tire pressure does not reach a
low enough level, or if the pressure is higher
than the pressure that was adjusted to when
the system was initialized. ■
When initialization of the tire pressure
warning system has failed
Initialization ca n be completed in a few min-
utes. However, in the following cases, the
settings have not been recorded and the
system will not operate properly. If repeated
attempts to record tire inflation pressure
settings are unsuccessf ul, have the vehicle
inspected by your Lexus dealer. ●
When operating the tire pressure warn-
ing reset switch, the tire pressure warning
light does not blink 3 times. ●
After carrying out the initialization proce-
dure, the tire pressure warning light
blinks for 1 minute then stays on after
driving for 20 minutes.
WARNING
■
When initializing the tire pressure
warning system
Do not initializing tire inflation pressure
without first adjusting the tire inflation
pressure to the spec ified level. Other-
wise, the tire pressu re warning light may
not come on even if the tire inflation pres-
sure is low, or it may come on when the
tire inflation pressure is actually normal.

350 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 
Type A
Normal fuse
Blown fuse 
Type B
Normal fuse
Blown fuse 
Type C
Normal fuse
Blown fuse 
Type D
Normal fuse
Blown fuse ■
After a fuse is replaced ●
If the lights do not turn on even after the
fuse has been replaced, a bulb may need
replacement. ( → P.353)●
If the replaced fuse blows again, have the
vehicle inspected by your Lexus dealer. ■
If there is an overload in a circuit
The fuses are designed to blow, protecting
the wiring harness from damage. ■
When replacing light bulbs
Lexus recommends that you use genuine
Lexus products designed for this vehicle.
Because certain bulbs are connected to cir-
cuits designed to prevent overload, non-
genuine parts or parts not designed for this
vehicle may be unusable.A
B
A
B
A
B WARNING
■
To prevent system breakdowns and
vehicle fire
Observe the following precautions.
Failure to do so may cause damage to
the vehicle, and possibly a fire or injury.
●
Never use a fuse of a higher amperage
rating than that indicated, or use any
other object in place of a fuse.
●
Always use a genuine Lexus fuse or
equivalent.
Never replace a fuse with a wire, even
as a temporary fix. A
B