2016 LEXUS NX300H fuse

5027-3. Do-it-yourself maintenance
NX300h_OM_USA_OM78082U
Engine compartment
■12-volt battery
 P. 5 1 2
Fuse box ( P. 5 3 4 )
Engine coolant reservoir (P. 5 0 8 )
Engine oil filler cap ( P. 505)
Power control unit coolant reservoir ( P. 5 0 8 )
Brake fluid reservoir ( P. 5 1 0 ) Radiator (
P. 5 0 9 )
Condenser ( P. 5 0 9 )
Electric cooling fans
Engine oil level dipstick (P. 5 0 4 )
Wa s h e r f l u i d t a n k ( P. 5 1 1 )1
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5347-3. Do-it-yourself maintenance
NX300h_OM_USA_OM78082U
Checking 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.
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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_OM_USA_OM78082U
Luggage compartment
Remove the fuse.
Only type A fuse can be removed
using the pullout tool.
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5367-3. Do-it-yourself maintenance
NX300h_OM_USA_OM78082U
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, protecting 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.
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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_OM_USA_OM78082U
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.

5888-2. Steps to take in an emergency
NX300h_OM_USA_OM78082U
If the hybrid system will not start
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly. ( P. 5 9 1 )
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( P. 8 3 )
●There may be a malfunction in the immobilizer system. ( P. 8 6 )
●There may be a malfunction in the steering lock system.
●The hybrid system may be malfunctioni ng due to an electrical problem such
as electronic key battery depletion or a blown fuse. However, depending on
the type of malfunction, an interim meas ure is available to start the hybrid sys-
tem. ( P. 5 8 9 )
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 5 9 4 )
●The 12-volt battery terminal connections may be loose or corroded.
(P. 5 1 2 )
Reasons for the hybrid system not starting vary depending on the situation.
Check the following and perform the appropriate procedure:
The hybrid system will not start ev en though the correct starting proce-
dure is being followed. ( P. 201)
The interior lights and headlights are dim, or the horn does not sound or
sounds at a low volume.

5968-2. Steps to take in an emergency
NX300h_OM_USA_OM78082U
Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximately 5 minutes to recharge the 12-volt bat-
tery of your vehicle.
Open and close any of the doors of your vehicle with the power switch off.
Maintain the engine speed of the second vehicle and start the hybrid system
of your vehicle by turning the power switch to ON mode.
Make sure the “READY” indicator comes on. If the indicator light does not
come on, contact your Lexus dealer.
Once the hybrid system has started, remove the jumper cables in the exact
reverse order from which they were connected.
Close the exclusive jump starting terminal cover, and reinstall the fuse box
cover to its original position.
Once the hybrid system starts, have th e vehicle inspected at your Lexus dealer
as soon as possible.
■Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.
■To prevent 12-volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
●Turn off any unnecessary electrical components when the vehicle is running at a low
speed for an extended period, such as in heavy traffic.
■Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gradually even when the vehicle
is not in use, due to natural discharge and th e draining effects of certain electrical appli-
ances. If the vehicle is left for a long time, the 12-volt battery may discharge, and the
hybrid system may be unable to start. (The 12-volt battery recharges automatically while
the hybrid system is operating.)
■When the 12-volt battery is removed or discharged
●In some cases, it may not be possible to unlock the doors using the smart access system
with push-button start when the 12-volt battery is discharged. Use the wireless remote
control or the mechanical key to lock or unlock the doors.
●The hybrid system may not start on the first attempt after the 12-volt battery has
recharged but will start normally after the second attempt. This is not a malfunction.
●The power switch mode is memorized by the vehicle. When the 12-volt battery is
reconnected, the system will return to the mode it was in before the 12-volt battery was
discharged. Before disconnecting the 12-volt battery, turn the power switch off.
If you are unsure what mode the power switch was in before the 12-volt battery dis-
charged, be especially careful when reconnecting the 12-volt battery.
●The power back door must be initialized. ( P. 1 3 4 )
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6419-3. Initialization
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Vehicle specifications
NX300h_OM_USA_OM78082U
Items to initialize
*:If equipped
The following items must be initialized for normal system operation after such
cases as the 12-volt battery being reconnected, or maintenance being per-
formed on the vehicle.
ItemWhen to initializeReference
Message indicating mainte-
nance is required (U.S.A. only)• After the maintenance is per- formedP. 4 9 2
Tire pressure warning system
• When rotating the tires on vehi-
cles with differing front and rear
tire inflation pressures
• When changing the tire inflation
pressure by changing traveling
speed or load weight, etc.
• When changing the tire size
P. 5 1 8
Oil maintenance• After the maintenance is per- formedP. 5 0 6
Power back door*
• After reconnecting or changing
the 12-volt battery
• After changing a fuse
P. 1 3 4
Po w e r w i n d o w• When functioning abnormally normallyP. 1 6 7
Moon roof*P. 1 7 0