fuse box LEXUS RX450h 2021 Owners Manual

3716-3. Do-it-yourself maintenance
6
Maintenance and care
Washer fluid tank (P.375)
Brake fluid reservoir ( P.375)
Engine oil level dipstick ( P.372)
Engine coolant reservoir ( P.373)
Power control unit coolant reservoir ( P.373)
Fuse boxes ( P.395)
Radiator ( P.374)
Power control unit coolant radiator ( P.374)
Condenser ( P.374)
Electric cooling fans
Engine oil filler cap ( P.372)
■12-volt battery
 P.376
With the engine at operating tempera-
ture and turned off, check the oil level
Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
K
Checking and adding the engine
oil

3956-3. Do-it-yourself maintenance
6
Maintenance and care
1Turn the power switch off.
2 Open the fuse box cover.
Engine compartment
Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.
Luggage compartment (type A fuse
box)
RX450h:
Remove the 12-volt battery cover.
( P.376) RX450hL:
Remove the deck board and side auxiliary
box cover and 12-volt battery cover.
(
 P.376)
Luggage compartment (type B fuse
box)
RX450h:
Remove the terminal cover.
RX450hL:
Remove the terminal cover.
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

3966-3. Do-it-yourself maintenance
3Remove the fuse with the pullout
tool.
Only some fuses can be removed
using the pullout tool.
4 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.
Many types of fuse are used on this vehicle.
This illustration shows a common type of
fuse used on this vehicle.
■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.399)
●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
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.
●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.

4507-2. Steps to take in an emergency
If you have a set of jumper (or booster)
cables and a second vehicle with a
12-volt battery, you can jump start your
vehicle by following the steps below.
1Confirm that the electronic key is
being carried.
When connecting the jumper (or booster)
cables, depending on the situation, the
alarm may activate and doors locked.
( P.76)
2 Open the hood ( P.369) and fuse
box cover. 3
Open the exclusive jump starting
terminal cover.
4 Remove the engine cover.
5 Connect a positive jumper cable clamp to on your vehicle and connect the
clamp on the other end of the positive cab le to on the second vehicle. Then,
Restarting the hybrid system
A
B

4517-2. Steps to take in an emergency
7
When trouble arises
connect a negative cable clamp to on the second vehicle and connect the
clamp at the other end of the negative cable to .
Exclusive jump starting terminal (your vehicle)
Positive (+) battery terminal (second vehicle)
Negative (-) battery terminal (second vehicle)
Solid, stationary, unpainted metallic point away from the exclusive jump starting
terminal and any mo ving parts as shown in the illustration
6 Start the engine of the second vehi-
cle. Increase the engine speed
slightly and maintain at that level for
approximately 5 minutes to
recharge the 12-volt battery of your
vehicle.
7 Open and close any of the doors of
your vehicle with the power switch
off.
8 Maintain the engine speed of the
second vehicle and start the hybrid
system of your vehicle by turning
the power switch to ON mode.
9 Make sure the “READY” indicator
comes on. If the indicator light does
not come on, contact your Lexus
dealer. 10
Once the hybrid system has
started, remove the jumper cables
in the exact reverse order from
which they were connected.
11 Close the exclusive jump starting
terminal cover, and reinstall the fuse
box cover to its original position.
Once the hybrid system starts, have
the 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 sys-
tem while the hybrid system is off.
●Turn off any unnecessary electrical com-
C
D
A
B
C
D

517Alphabetical Index
Front side marker lightsReplacing light bulbs............................... 400
Wattage..........................................................468
Front turn signal lights Replacing light bulbs................... 400, 402
Turn signal lever ...........................................194
Wattage..........................................................468
Fuel Capacity ......................................................... 462
Fuel gauge ....................................................... 83
Information .................................................... 469
Refueling ............................................................211
Type.................................................................. 462
Warning light ................................................. 421
Fuel consumption Average fuel economy .............................. 90
Current fuel consumption........................ 90
Fuel filler door If the fuel filler door cannot be opened......................................................................... 446
Refueling ............................................................211
Fuel gauge ......................................................... 83
Fuses ................................................................. 395
G
Garage door opener ................................. 346
Gauges ............................................................... 83
G-force................................................................. 91
Glove box ....................................................... 326
Glove box light ............................................. 326
Grocery bag hooks .................................... 330
H
Hands Free Power Back Door ................. 116
Head restraints ...............................................145
Headlight aim ................................................ 397
Headlights Adaptive Front-lighting System (AFS)......................................................................... 202
Automatic High Beam system............ 203
Light switch ...................................................200 Replacing light bulbs ............................... 400
Head-up display.............................................. 95 Driving information display area ...........95
HUD (Head-up display) switch ............ 96
Hybrid System Indicator ........................... 99
Navigation system-linked display ........98
Settings............................................................... 97
Heated steering wheel ............................... 318
Heaters Front automatic air conditioning system......................................................................... 304
Heated steering wheel ............................. 318
Outside rear view mirrors.................... 306
Rear automatic air conditioning system
........................................................................... 315
Seat heaters ................................................... 318
High mounted stoplight Replacing light bulbs ............................... 400
High-voltage components ......................... 69
Hill-start assist control ............................... 284
Hood Open............................................................... 369
Hooks Cargo hooks................................................329
Cargo net hooks ........................................329
Coat hooks ...................................................343
Front passenger footwell hooks.........345
Grocery bag hooks................................. 330
Retaining hooks (floor mat) ..................... 24
Horn ................................................................... 148
HUD (Head-up display) switch ................ 96
Hybrid battery (traction battery) Location ............................................................. 69
Specification ................................................. 462
Warning message ........................................ 72
Hybrid battery (traction battery) air vents ............................................................................... 71
Hybrid system .................................................. 66 Acoustic Vehicle Alerting System .......68
Emergency shut off system...................... 72
Energy monitor/consumption screen99
EV drive mode............................................. 189