2018 LEXUS NX300h Owners Manual

3456-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care When replacing wheels, care should
be taken to ensure that they are equiv-
alent to those removed in load capac-
ity, diameter, rim width and inset *
.
Replacement wheels are available at
your Lexus dealer. *
: Conventionally referred to as offset.
Lexus does not recommend using the
following:
 Wheels of different sizes or types
 Used wheels
 Bent wheels that have been straight-
ened ■
When replacing wheels
The wheels of your vehicle are equipped
with tire pressure warning valves and trans-
mitters that allow the tire pressure warning
system to provide advance warning in the
event of a loss in tire inflation pressure.
Whenever wheels are replaced, tire pres-
sure warning valves an d transmitters must
be installed. ( → P.338, 345)  Use only Lexus wheel nuts and
wrenches designed for use with
your aluminum wheels.
 When rotating, repairing or chang-
ing your tires, check that the wheel
nuts are still tight after driving 1000
miles (1600 km).
 Be careful not to damage the alumi-
num wheels when using tire chains.
 Use only Lexus genuine balance
weights or equivalent and a plastic
or rubber hammer when balancing
your wheels.Wheels If a wheel is bent, cracked or heavily
corroded, it should be replaced.
Otherwise, the tire may separate
from the wheel or cause a loss of
handling control.
Wheel selection
WARNING
■
When replacing wheels
●
Do not use wheels that are a different
size from those recommended in the
Owner’s Manual, as this may result in a
loss of handling control. ●
Never use an inner tube in a leaking
wheel which is designed for a tubeless
tire. Doing so may result in an acci-
dent, causing death or serious injury. ■
Use of defective wheels prohibited
Do not use cracked or deformed wheels.
Doing so could cause the tire to leak air
during driving, possibly causing an acci-
dent.
NOTICE■
Replacing tire pressure warning
valves and transmitters ●
Because tire repair or replacement
may affect the tire pressure warning
valves and transmitters, make sure to
have tires serviced by your Lexus
dealer or other qua lified service shop.
In addition, make sure to purchase
your tire pressure warning valves and
transmitters at your Lexus dealer. ●
Ensure that only genuine Lexus wheels
are used on your vehicle.
Tire pressure warning valves and trans-
mitters may not work properly with
non-genuine wheels.
Aluminum wheel precautions

346 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 1 Turn the power switch off.
2 Open the glove box. Slide off the
damper.
3 Push in the glove box on the vehi-
cle’s outer side to disconnect the
claws. Then pull out the glove box
and disconnect the lower claws. 4 Remove the filter cover.
5 Remove the air conditioning filter
and replace it with a new one. The “ UP” marks shown on the filter
should be pointing up.
■
Checking interval
Inspect and replace the air conditioning fil-
ter according to the maintenance schedule.
In dusty areas or areas with heavy traffic
flow, early replacement may be required.
(For scheduled maintenance information,
please refer to the “Owner’s Manual Sup-
plement” or “Scheduled Maintenance”.)
■
If air flow from the vents decreases dra-
matically
The filter may be clogged. Check the filter
and replace if necessary.
■
Air conditioning filt er with deodorizing
function
When fragrances are placed in your vehi-
cle, the deodorizing effect may become
significantly weakened in a short period:
When an air conditioning odor comes out
continuously, replace the conditioning filter.Air conditioning filter The air conditioning filter must be
changed regularly to maintain air
conditioning efficiency.
Removal method

3476-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care Prepare the following before replacing
the battery:
 Flathead screwdriver
 Lithium battery CR2032 ■
Use a CR2032 lithium battery ●
Batteries can be purchased at your Lexus
dealer, local electrical appliance shops or
camera stores. ●
Replace only with the same or equivalent
type recommended by the manufacturer.●
Dispose of used batteries according to
the local laws.
1 Take out the mechanical key.
2 Remove the cover. To prevent damage to the key, cover the tip NOTICE■
When using the air conditioning sys-
tem
Make sure that a filter is always installed.
Using the air conditioning system without
a filter may cause damage to the system.
Electronic key battery Replace the battery with a new one
if it is depleted.
Items to prepare
Replacing the battery

348 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U of the flathead screwdriver with a tape.
3 Remove the depleted battery.Insert a new battery with the “+” terminal
facing up.
■
When the card key battery needs to be
replaced (if equipped)
The battery for th e card key is available only
at Lexus dealers. Your Lexus dealer can
replace the battery for you. ■
If the electronic key battery is depleted
The following symptoms may occur: ●
The smart access syst em with push-but-
ton start and wireless remote control will
not function properly.
●
The operational rang e will be reduced.
WARNING
■
Removed battery and other parts
These parts are small and if swallowed by
a child, they can cause choking. Keep
away from children. Failure to do so
could result in death or serious injury. NOTICE■
For normal operation after replacing
the battery
Observe the following precautions to
prevent accidents: ●
Always work with dry hands.
Moisture may cause the battery to
rust. ●
Do not touch or move any other com-
ponent inside the remote control. ●
Do not bend either of the battery ter-
minals.

3496-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care 1 Turn the power switch off.
2 Open the fuse box cover. 
Engine compartment: type A fuse
box Push the tab in and lift the lid off.

Engine compartment: type B fuse
box Push the tab in and lift the lid off.

Left side instrument panel
Remove the lid. 
Luggage compartment
3 Remove the fuse. Only type A fuse can be removed using the
pullout tool.
4 Check if the fuse is blown. Replace the blown fuse with a new fuse of
an appropriate amperage rating. The
amperage rating can be found on the fuse
box lid.Checking and replacing
fuses If any of the electrical components
do not operate, a fuse may have
blown. If this happens, check and
replace the fuses as necessary.
Checking and replacing fuses

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

3516-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U 6
Maintenance and care 
Type A
Adjustment bolt A
Adjustment bolt B 
Type B
Adjustment bolt A
Adjustment bolt B
 Make sure the vehicle has a full tank
of gasoline and the area around the
headlight is not deformed.
 Park the vehicle on level ground.
 Make sure the tire inflation pressure WARNING●
Do not modify the fuses or fuse boxes.■
Fuse box near the power control unit
Never check or replace the fuses as
there are high voltage parts and wiring
near the fuse box.
Doing so may cause electric shock,
resulting in death or serious injury.
NOTICE■
Before replacing fuses
Have the cause of electrical overload
determined and repaired by your Lexus
dealer as soon as possible. Headlight aim
Vertical movement adjusting
bolts
Before checking the headlight
aim A
B
A
B

352 6-3. Do-it-yourself maintenance
LEXUS NX300h Owners Manu-
al_USA_OM78212U is at the specified level.
 Have someone sit in the driver’s
seat.
 Bounce the vehicle several times.
1 Using a Phillips-head screwdriver,
turn bolt A in either direction.
Remember the turning direction
and the number of turns. 
Type A 
Type B
2 Turn bolt B the same number of
turns and in the same direction as
step 1 .If the headlight cannot be adjusted using
this procedure, take the vehicle to your
Lexus dealer to adjust the headlight aim. 
Type A 
Type BAdjusting the headlight aim