2018 LEXUS LS500 fuse

4076-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care 
Type D
Normal fuse
Blown fuse ■
After a fuse is replaced●
When installing the lid, make sure that the
tab is installed securely.●
If the lights do not turn on even after the
fuse has been replaced, a bulb may need
replacement.●
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.
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. A
B NOTICE■
Before replacing fuses
Have the cause of electrical overload
determined and repaired by your Lexus
dealer as soon as possible.

434 7-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) ( → P.438)
 The battery terminal connections
may be loose or corroded.
( → P.384)
The engine starting system may be
malfunctioning due to an electrical
problem such as electronic key battery
depletion or a blown fuse. However, an
interim measure is available to start the
engine. ( → P.434)
One of the following may be the cause
of the problem:
 One or both of the battery terminals
may be disconnected. ( → P.384)
 The battery may be discharged.
( → P.438)
 There may be a malfunction in the
steering lock system. Contact your Lexus dealer if the problem
cannot be repaired, or if repair procedures
are unknown.
When the engine does not start, the
following steps can be used as an
interim measure to start the engine if
the engine switch is functioning nor- mally.
Do not use this starting procedure
except in cases of emergency.
1 Press the parking brake switch to
check that the parking brake is set.
( → P.170) Parking brake indicator will come on.
2 Turn the engine switch to ACCES-
SORY mode.
3 Press and hold the engine switch
for about 15 seconds while
depressing the brake pedal firmly.
Even if the engine can be started using
the above steps, the system may be
malfunctioning. Have the vehicle
inspected by your Lexus dealer.The starter motor does not turn
over
The starter motor does not turn
over, the interior lights and head-
lights do not turn on, or the horn
does not sound.
Starting the engine in an emer-
gency

4397-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 7
When trouble arises 4 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 battery of your vehi-
cle.
5 Open and close any of the doors of
your vehicle with the engine switch
off.
6 Maintain the engine speed of the
second vehicle and start the engine
of your vehicle by turning the
engine switch to IGNITION ON
mode.
7 Once the vehicle’s engine has
started, remove the jumper cables
in the exact reverse order from
which they were connected. 
Method connecting jumper (or
booster) cables to the exclusive
jump starting terminal
1 Confirm 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.61) 2 Open the hood. Remove the pas-
senger side engine compartment
cover. ( → P.375, 378)
3 Remove the service
cover.( → P.379)
4 Open the fuse box cover. Push the tab in and lift the lid off.
5 Open the exclusive jump starting
terminal cover.
6 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, A
B

440 7-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 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
7 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 battery of your vehi-
cle.
8 Open and close any of the doors of
your vehicle with the engine switch
off.
9 Maintain the engine speed of the
second vehicle and start the engine
of your vehicle by turning the
engine switch to IGNITION ON
mode.
10 Once the vehicle’s engine 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.
12 Install the service cover.( → P.379)
13 Install the engine compartment
cover.
Once the engine starts, have the vehi-
cle inspected at your Lexus dealer as
soon as possible. ■
Starting the engine when the battery is
discharged
The engine cannot be started by push-start-
ing.
■
To prevent battery discharge
●
Turn off the headlights and the audio sys-
tem while the engine is off.
●
Turn off any unnecessary electrical com-
ponents when the vehicle is running at a C
D
A
B
C
D

5011-1. What to do if... (Troubleshooting)
LS500_OM_OM50F54U_(U) 501Alphabetical Index
Fuel
Capacity ......................................................... 449
Fuel gauge ...............................................69, 72
Fuel pump shut off system ...................... 417
Information .................................................... 457
Refueling ......................................................... 185
Type.................................................................. 449
Warning light ................................................. 421
Fuel consumption
Average fuel economy .............................. 78
Current fuel consumption........................ 78
Fuel filler door
If the fuel filler door cannot be opened
......................................................................... 435
Refueling ......................................................... 185
Fuel gauge ................................................. 69, 72
Fuel pump shut off system.......................... 417
Fuses ................................................................. 405
G
Garage door opener ................................. 349
Gauges ....................................................... 69, 72
Gear Position................................................... 80
G-force............................................................... 80
Glove box ....................................................... 335
Glove box light ............................................. 336
H
Hands Free Power Trunk Lid .................. 103
Head restraints ...............................................132
Headlights
Adaptive Front-lighting System (AFS)
........................................................................... 177
Automatic High Beam system..............178
Light switch ..................................................... 175
Replacing light bulbs............................... 408
Head-up display.............................................. 83
Driving information display area........... 83
Driving support system display area .. 86
Eco Driving Indicator ................................. 87
HUD (Head-up display) switch............85 Navigation system-linked display ........83
Pop-up display ...............................................86
Settings...............................................................85
Heated steering wheel .............................. 326
Heaters
Front air conditioning system ............... 313
Heated steering wheel ............................326
Outside rear view mirrors.......................314
Rear air conditioning system ............... 323
Seat heaters ..................................................326
Height control
Electronically modulated air suspension
.......................................................................... 292
Hill-start assist control ............................... 294
Hood
Open................................................................375
Pop Up Hood.................................................38
Hooks
Coat hooks ...................................................343
Retaining hooks (floor mat) ..................... 22
Horn ....................................................................135
HUD (Head-up display) switch ................ 85
I
I/M test ............................................................ 372
Identification
Engine..............................................................449
Vehicle ........................................................... 448
Ignition switch (engine switch)................ 160
Auto power off function............................162
Changing the engine switch modes ..162
If your vehicle has to be stopped in an
emergency .................................................. 410
Indicators ........................................................... 66
Initialization
Items to initialize .........................................482
Maintenance......................................368, 381
Power windows ........................................... 139
Tire pressure warning system .............392
Inside door handle lights........................... 330
Inside rear view mirror ................................136
Instrument panel light control ............. 71, 75

5051-1. What to do if... (Troubleshooting)
LS500_OM_OM50F54U_(U) 505Alphabetical Index
Operation........................................................139
Window lock switch ....................................141
Pre-Collision System (PCS)
Function ............................................... 200, 210
PCS OFF switch ..............................203, 213
Warning light ............................................... 424
Warning message.............................210, 217 R
Radar cruise control (dynamic radar cruise
control with full-speed range)... 238, 241
Radiator ........................................................... 382
RCD (Rear camera detection) .............. 256
Warning message..................................... 269
RCD (Rear Camera Detection)
Function ..........................................................268
RCTA
Function .......................................................... 264
Warning message..................................... 265
RCTA (Rear Cross Traffic Alert) ......... 256
RCTA function ............................................. 265
Rear air conditioning system .................. 323
Rear Cross Traffic Alert (RCTA) ......... 264
Rear door sunshades ................................. 346
Rear Multi Operation Panel ...................308
Rear seat position memory ........................ 131
Rear seats .........................................................123
Adjustment...................................................... 123
Head restraints ............................................. 132
Rear seat position memory ..................... 131
Relaxation system........................................ 126
Seat heaters .................................................. 326
Seat ventilators............................................ 326
Rear side marker lights
Light switch ..................................................... 175
Replacing light bulbs............................... 408
Rear sunshades ............................................ 347
Rear turn signal lights
Replacing light bulbs............................... 408
Turn signal lever ...........................................169
Rear view mirror
Inside rear view mirror..............................136 Outside rear view mirrors.......................137
Rear window defogger ...............................314
Refueling
Capacity .........................................................449
Fuel types .......................................................449
If the fuel filler do or cannot be opened
..........................................................................435
Opening the fuel tank cap ..................... 185
Remote Touch .............................................. 304
Replacing
Electronic key battery ............................. 403
Fuses................................................................ 405
Light bulbs .................................................... 408
Tires ................................................................. 396
Resetting the message indicating mainte-
nance is required ...................................... 368
Rev indicator .....................................................74
Rev peak..............................................................74
Road Sign Assist .......................................... 238
RSA (Road Sign Assist) ............................ 238
Run-flat tires....................................... 388, 432
S
Seat belt buckle lights ................................ 330
Seat belt reminder light....................421, 422
Seat belts............................................................ 24
Automatic Locking Retractor................. 26
Child restraint system installation ......... 46
Cleaning and maintaining the seat belt
......................................................................... 365
Easy Access Buckle .................................... 26
Emergency Locking Retractor .............. 26
How to wear your seat belt ..................... 25
How your child should wear the seat belt
............................................................................. 25
Pregnant women, proper seat belt use
............................................................................. 24
Reminder light and buzzer ......... 421, 422
Seat belt extender......................................... 25
SRS warning light........................................ 419
Seat heaters ................................................... 326
Seat position memory......................... 127, 131