LEXUS NX300h 2015 Owners Manual

5317-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_U_OM78007U 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 filt er according to the ma intenance schedule. In
dusty areas or areas with heavy traffic flow, early replacement may be required. (For
scheduled maintenance informat ion, please refer to the “Owner’s Manual Supplement”
or “Scheduled Maintenance”.) ■
If air flow from the vents decreases dramatically
The filter may be clogged. Check the filter and replace if necessary. 5
NOTICE ■
When using the air conditioning system
Make sure that a filter is always installed.
Using the air conditioning system without a filter may cause damage to the system.

532 7-3. Do-it-yourself maintenance
NX300h_U_OM78007UElectronic key battery ●
Flathead screwdriver ●
Lithium battery CR2032
Take out the mechanical key.
Remove the cover. To prevent damage to the key, cover the
tip of the flathead screwdriver with a
tape.
Remove the depleted battery. Insert a new battery with the “+” termi-
nal facing up.Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery 1
2
3

5337-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_U_OM78007U ■
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. ■
When the card key battery needs to be replaced (if equipped)
The battery for the 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 system with push-button start and wireless remote control will not
function properly. ●
The operational range will be reduced.
WA R N I N G ■
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 afte r 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 component inside the remote control. ●
Do not bend either of the battery terminals.

534 7-3. Do-it-yourself maintenance
NX300h_U_OM78007UChecking and replacing fuses Turn the power switch off.
Open the fuse box cover.If any of the electrical components do not operate, a fuse may have blown. If
this happens, check and replace the fuses as necessary. 1
2 
Engine compartment: type A fuse
box 
Engine compartment: type B fuse
box
Push the tab in and lift the lid off. Push the tab in and lift the lid off. 
Left side instrument panel
Remove the lid.

5357-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_U_OM78007U 
Luggage compartment
Remove the fuse.
Only type A fuse can be removed
using the pullout tool. 3

536 7-3. Do-it-yourself maintenance
NX300h_U_OM78007U Check if the fuse is blown.
Normal fuse
Blown fuse Replace the blown fuse with a new fuse of an appropriate amperage rating. The
amperage rating can be found on the fuse box lid.
■
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. 5 3 8 )●
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, protec ting the wiring harness from damage.■
When replacing light bulbs
Lexus recommends that you use genuine Lexu s products designed for this vehicle.
Because certain bulbs are connected to circui ts designed to prevent overload, nongenu-
ine parts or parts not designed for this vehicle may be unusable. 4
1
2
Ty p e A 
Ty p e B
Ty p e C 
Ty p e D

5377-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_U_OM78007U WA R N I N G ■
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 rati ng 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. ●
Do not modify the fuses or fuse boxes. ■
Fuse box near the power control unit
Never check or replace the fu ses as there are high voltage parts and wiring near the
fuse box.
Doing so may cause electric shock, re sulting in death or serious injury.
NOTICE ■
Before replacing fuses
Have the cause of electrical overload determ ined and repaired by your Lexus dealer as
soon as possible.

538 7-3. Do-it-yourself maintenance
NX300h_U_OM78007ULight bulbs Check the wattage of the light bulb to be replaced. (  P. 6 1 7 )
 P. 5 0 3
 P. 1 3 2You may replace the following bulbs by yourself. The difficulty level of replace-
ment varies depending on the bulb. If necessary bulb replacement seems diffi-
cult to perform, contact your Lexus dealer.
For more information about replacing other light bulbs, contact your Lexus
dealer.
Preparing for light bulb replacement
Removing the engine compartment cover
Canceling the power back door system

5397-3. Do-it-yourself maintenance
7
Maintenance and care
NX300h_U_OM78007U ■
Front
Bulb locations
Front turn signal light (bulb type)
Headlight high beam (halogen
bulbs) Front side marker light (bulb type)1
2 3

540 7-3. Do-it-yourself maintenance
NX300h_U_OM78007U ■
Rear
Back-up light
Rear turn signal light 1
2