2018 LEXUS LS500H fuse box

3876-3. Do-it-yourself maintenance
LS500h_OM_OM50F42U_(U) 6
Maintenance and care
Engine oil level dipstick ( → P.388)
Power control unit coolant reservoir ( → P.390)
Engine coolant reservoir ( → P.390)
Engine oil filler cap ( → P.389)
Brake fluid reservoir ( → P.391)
Fuse boxes ( → P.414)
Washer fluid tank ( → P.392)
Engine coolant radiator ( → P.391)
Power control unit coolant radiator ( → P.391)
Electric cooling fan
Condenser ( → P.391)■
12-volt battery
→ P.393Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
K

414 6-3. Do-it-yourself maintenance
LS500h_OM_OM50F42U_(U) 1 Turn the power switch off.
2 Open the fuse box cover. 
Engine compartment: type A fuse
box Push the tabs in and lift the lid off.

Engine compartment: type B fuse
box Remove the engine compartment cover
( → P.388) and push the ta bs in and lift the
lid off.WARNING■
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■
When replacing the battery
Use a flathead screwdriver of appropri-
ate size. Applying excessive force may
deform or damage the cover. ■
For normal operation after 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 com-
ponent inside the remote control.●
Do not bend either of the battery ter-
minals. 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

4156-3. Do-it-yourself maintenance
LS500h_OM_OM50F42U_(U) 6
Maintenance and care 
Driver’s side instrument panel Push the tab in and remove the lid.
Make sure to push the tab in during
removal or installation.

Passenger’s side instrument panel Push the tab in and remove the lid.
Make sure to push the tab in during
removal or installation.

Trunk Remove the luggage mat. ( → P.348)
Push the tab in and lift the lid off. 3 Remove the fuse with the pullout
tool.
Only type A fuse can be removed
using the pullout tool.
4 Check if the fuse is blown. Type A and B:
Replace the blown fuse with a new fuse of
an appropriate amperage rating. The
amperage rating can be found on the fuse
box lid.
Type C and D:
Contact your Lexus dealer.

416 6-3. Do-it-yourself maintenance
LS500h_OM_OM50F42U_(U) 
Type A
Normal fuse
Blown fuse 
Type B
Normal fuse
Blown fuse 
Type C
Normal fuse
Blown fuse 
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.A
B
A
B
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. A
B

4497-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises and fuse box cover. ( → P.385,
388)Push the tabs in and lift the lid off.
3 Open the exclusive jump starting
terminal cover.
4 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,
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
5 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. A
B
C
D
A
B
C
D

450 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 6 Open and close any of the doors of
your vehicle with the power switch
off.
7 Maintain the engine speed of the
second vehicle and start the hybrid
system of your vehicle by turning
the power switch to ON mode.
8 Make sure the “READY” indicator
comes on. If the indicator does not
come on, contact your Lexus
dealer.
9 Once the hybrid system has
started, remove the jumper cables
in the exact reverse order from
which they were connected.
10 Close the exclusive jump starting
terminal cover and install the fuse
box cover and en gine compart-
ment cover.
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-
ponents when the vehicle is running at a
low speed for an extended period, such
as in heavy traffic.
■
When the 12-volt battery is removed or
discharged
●
Information stored in the ECU is cleared.
When the 12-volt battery is depleted,
have the vehicle inspected at your Lexus
dealer.
●
Some systems may require initialization. ( → P.495)■
When removing the 12-volt battery ter-
minals
When the 12-volt battery terminals are
removed, the information stored in the
ECU is cleared. Before removing the
12-volt battery terminals, contact your
Lexus dealer. ■
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 dis-
charge and the draining effects of certain
electrical appliances. If the vehicle is left for
a long time, the 12-volt battery may dis-
charge, and the hybrid system may be
unable to start. (The 12-volt battery
recharges automatically while the hybrid
system is operating.) ■
When recharging or replacing the
12-volt battery ●
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 mechani-
cal 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
discharged, be especially careful when
reconnecting the 12-volt battery.
■
When replacing the 12-volt battery
●
Use a Central Degassing type 12-volt
battery (European Regulations).
●
Use a 12-volt battery with the same case
size as the previous 12-volt battery and an
epuivalent 20 hour rate capacity (20HR)
or greater.

5151-1. What to do if... (Troubleshooting)
LS500h_OM_OM50F42U_(U) 515Alphabetical Index
Fuel consumption
Average fuel economy ..............................88
Current fuel consumption........................88
Fuel filler door
If the fuel filler door cannot be opened
......................................................................... 445
Refueling ..........................................................194
Fuel gauge ...................................................77, 81
Fuses ...................................................................414 G
Garage door opener .................................358
Gauges .........................................................77, 81
Gear Position................................................... 89
G-force............................................................... 89
Glove box ....................................................... 344
Glove box light ............................................. 345
H
Hands Free Power Trunk Lid .................... 115
Head restraints ...............................................144
Headlights
Adaptive Front-lighting System (AFS)
...........................................................................187
Automatic High Beam system............. 188
Light switch .................................................... 185
Replacing light bulbs.................................. 417
Head-up display.............................................. 92
Driving information display area........... 92
Driving support system display area .. 95
HUD (Head-up display) switch............ 94
Hybrid System Indicator ........................... 96
Navigation system-linked display ........ 92
Pop-up display............................................... 95
Settings .............................................................. 94
Heated steering wheel .............................. 336
Heaters
Front air conditioning system .............. 323
Heated steering wheel............................ 336
Outside rear view mirrors .................... 324
Rear air conditioning system ............... 333 Seat heaters ..................................................336
Height control
Electronically modulated air suspension
......................................................................... 300
High-voltage components ........................... 61
Hill-start assist control ............................... 303
Hood
Open............................................................... 385
Pop Up Hood.................................................38
Hooks
Coat hooks ...................................................352
Retaining hooks (floor mat) ..................... 22
Horn .................................................................... 147
HUD (Head-up display) switch ................ 94
Hybrid battery (traction battery)
Location ...............................................................61
Specification ................................................. 462
Warning message ........................................ 64
Hybrid battery (traction battery) air vents
............................................................................. 64
Hybrid system .................................................. 58
Emergency shut off system...................... 64
Energy monitor/consumption screen96
EV drive mode.............................................. 172
High voltage components .........................61
Hybrid system precautions........................61
If the hybrid system will not start ........ 443
Overheating .................................................454
Power (ignition) switch ............................ 168
Regenerative braking .................................59
Starting the hybrid system ...................... 168
Vehicle proximity noti fication system.60
Hybrid System Indicator............. 78, 83, 96
Hybrid transmission...................................... 174
M mode ............................................................179
Paddle shift switches ....................... 178, 179
Snow mode..................................................... 177
Hybrid vehicle driving tips ....................... 307
I
I/M test ............................................................ 382