2018 LEXUS RX450h fuses

TABLE OF CONTENTS
6
RX450h_RX450hL _U_OM48F85U7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ................580
Cleaning and protecting
the vehicle interior.................. 584
7-2. Maintenance
Maintenance
requirements ............................ 587
General mainte nance..............589
Emission inspection and
maintenance (I/M)
programs.................................... 592
7-3. Do-it-yourself
maintenance
Do-it-yourself service
precautions................................ 593
Hood ............................................... 595
Positioning a floor jack ............ 596
Engine compartment ............... 597
12-volt battery ............................. 605
Tires .................................................... 611
Tire inflation pressure .............. 620
Wheels ........................................... 623
Air conditioning filter ............... 625
Windshield wiper inserts ........ 628
Electronic key battery.............. 630
Checking and replacing
fuses.............................................. 632
Headlight aim .............................. 635
Light bulbs .................................... 637 8-1. Essential information
Emergency flashers .................. 652
If your vehicle has
to be stopped in
an emergency .......................... 653
8-2. Steps to take in
an emergency
If your vehicle needs to be
towed ........................................... 654
If you think something is
wrong........................................... 659
If a warning light turns
on or a warning buzzer
sounds ......................................... 660
If a warning message is
displayed .................................... 667
If you have a flat tire .................. 673
If the hybrid system will
not start ....................................... 690
If the electronic key does
not operate properly ............. 692
If the 12-volt battery is
discharged................................. 695
If your vehicle overheats......... 702
If the vehicle becomes stuck .........7067
Maintenance and care 8
When trouble arises

579
7Maintenance and care
RX450h_RX450hL _U_OM48F85U7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior................ 580
Cleaning and protecting
the vehicle interior ................. 584
7-2. Maintenance
Maintenance
requirements.............................587
General maintenance ............. 589
Emission inspection and
maintenance (I/M)
programs ....................................592 7-3. Do-it-yourself
maintenance
Do-it-yourself service
precautions................................593
Hood ...............................................595
Positioning a floor jack ............ 596
Engine compartment ............... 597
12-volt battery .............................605
Tires .................................................... 611
Tire inflation pressure............... 620
Wheels ........................................... 623
Air conditioning filter ............... 625
Windshield wiper inserts ........ 628
Electronic key battery ..............630
Checking and replacing
fuses .............................................. 632
Headlight aim .............................. 635
Light bulbs..................................... 637

593
RX450h_RX450hL _U_OM48F85U 7
Maintenance and care 7-3. Do-it-yourself maintenance
Do-it-yourself service precautions If you perform maintenance by yourself, be sure to follow the correct proce-
dure as given in these sections. Items Parts and tools
12-volt battery con-
dition ( → P. 605) •Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( → P. 603) • FMVSS No.116 DOT 3 or SAE J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/power con-
trol unit coolant level
( → P. 601) • “Toyota Super Long Life Coolan t” or a similar high quality
ethylene glycol-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 Cool ant” is pre-mixed with 55%
coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
( → P. 598) • “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( → P. 632) • Fuse with same amperage rating as original
Headlight aim
*( → P. 635) • Phillips-head screwdriver
Light bulbs
( → P. 637) • Bulb with same number and wattage rating as original
• Flathead screwdriver •Wrench
Radiator and con-
denser ( → P. 602) ⎯
Tire inflation pres-
sure ( → P. 620) • Tire pressure gauge • Compressed air source

632 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UTurn the power switch off.
Open the fuse box cover. ■
Engine compartment
Push the tab in and lift the lid off.
■
Driver’s side instrument panel
Remove the lid.Checking and replacing fuses If any of the electrical components do not operate, a fuse may have blown. If
this happens, check and repl ace the fuses as necessary.1
2

6337-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85U■
Luggage compartment (type A fuse box)
■
Luggage compartment (type B fuse box)
Remove the fuse with the pullout
tool.
Only some fuses can be removed
using the pullout tool. 
RX450h 
RX450hL
Remove the 12-volt battery cover.
( → P. 606) Remove the deck board and side aux-
iliary box cover and 12-volt battery
cover. ( → P. 606)
RX450h 
RX450hL
Remove the terminal cover. Remove the terminal cover. 3

634 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UCheck if the fuse is blown.
Normal fuse
Blown fuse Replace the blown fuse with a new
fuse of an appropriate amperage rat-
ing. The amperage rating can be
found on the fuse box lid.
Many types of fuse are used on this
vehicle. This illustration shows a com-
mon 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. 637)●
If the replaced fuse blows again, have th e vehicle inspected by your Lexus dealer.■
If there is an overload in a circuit
The fuses are designed to blow, protec ting the wiring ha rness from damage.■
When replacing light bulbs
Lexus recommends that you use genuine Lexus products designed for this vehicle.
Because certain bulbs are conne cted to circuits designed to prevent overload, nongenu-
ine parts or parts not designed for this vehicle may be unusable. 4
1
2
WARNING ■
To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to th e 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 wi re, 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 volt age 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 determined and repaired by your Lexus dealer as
soon as possible.

777Alphabetical index
RX450h_RX450hL _U_OM48F85UFlat tire ...................................................... 673
Floor mats ................................................... 28
Fluid
Brake ..........................................................716
Transmission...........................................716
Washer .................................................. 604
Fog lights
Replacing light bulbs ........................637
Switch.......................................................266
Front automatic air
conditioning system ......................... 507
Front passenger footwell
hooks ...................................................... 557
Front passenger occupant
classification system .............................47
Front passenger’s seat belt
reminder light ..................................... 662
Front seat heaters................................. 526
Front seats ................................................. 167
Adjustment ..............................................167
Cleaning ................................................ 584
Correct driving posture ....................30
Driving position memory .................. 181
Head restraints ..................................... 186
Power easy access system .............. 181
Seat heaters ..........................................526
Seat position memory......................... 181
Front side marker lights
Light switch .......................................... 258
Replacing light bulbs ........................637
Wattage ....................................................719 Front turn signal lights
Replacing light bulbs ....................... 637
Turn signal lever ................................. 252
Wattage ................................................... 719
Fuel
Capacity................................................... 712
Fuel gauge ............................................... 96
Information............................................ 720
Refueling .................................................274
Type............................................................ 712
Fuel filler door......................................... 274
Refueling .................................................274
When the fuel filler door
cannot be opened ..........................277
Fuses...........................................................632
Garage door opener.......................... 560
Gauges.........................................................96
Glove box ............................................... 534
Grocery bag hooks............................... 541F
G

784 Alphabetical index
RX450h_RX450hL _U_OM48F85URadar cruise control
(dynamic radar cruise control
with full-speed range) ..................... 306
Radiator .................................................... 602
Radio.......................................................... 426
Rear automatic air conditioning
system .................................................... 522
Rear Cross Traffic Alert ......................319
Rear Cross Traffic Auto
Brake ...................................................... 356
Rear door sunshades .......................... 557
Rear passengers’ seat belt
reminder light ..................................... 662
Rear seat
Folding down the rear
seatbacks ............................................. 168
Rear side marker lights
Light switch .......................................... 258
Replacing light bulbs ........................637
Rear turn signal lights
Replacing light bulbs ........................637
Turn signal lever ................................. 252
Wattage ....................................................719 Rear view mirror
Inside rear view mirror....................... 191
Outside rear view mirrors ..............193
Rear window defogger ........................ 516
Rear window wiper .............................. 272
Refueling................................................... 274
Capacity................................................... 712
Fuel types................................................. 712
Opening the fuel tank cap .............274
When the fuel filler door
cannot be opened ..........................277
Regenerative braking............................. 76
Remote Touch
* .................................... 500
Replacing
Electronic key battery .....................630
Fuses ........................................................ 632
Light bulbs............................................. 637
Tires .......................................................... 673
Windshield wiper inserts ............... 628
Reporting safety defects
for U.S. owners ...................................752
Resetting the message indicating
maintenance is required ................ 588
Rev indicator ............................................. 98
Rev peak ..................................................... 98
Road accident cautions .......................... 81R