check engine LEXUS LS500 2020 Workshop Manual

4056-3. Do-it-yourself maintenance
6
Maintenance and care
1Turn the engine switch off.
2 Open the fuse box cover.
Engine compartment: type A fuse
box
Remove the service cover ( P.379) and
push the tabs in and lift the lid off.
Engine compartment: type B fuse
box
Remove the engine compartment cover
(  P.378) and push the ta bs in and lift the
lid off.
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.343)
Push the tab in and lift the lid off.
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

4267-2. Steps to take in an emergency
■Brake hold operated indicator (warning buzzer)
■Master warning light (warning buzzer)
■Warning buzzer
In some cases, the bu zzer may not be heard
due to being in a noisy location or audio
sound.
■Front passenger detection sensor, seat
belt reminder and warning buzzer
●If luggage is placed on the front passen-
ger seat, the front passenger detection
sensor may cause th e warning light to
flash and the warning buzzer to sound
even if a passenger is not sitting in the
seat.
●If a cushion is placed on the seat, the sen-
sor may not detect a passenger, and the
warning light may not operate properly.
■SRS warning light
This warning light system monitors the air-
bag sensor assembly, Pop Up Hood com-
puter assembly, front impact sensors, side
impact sensors (front door), side impact
sensors (front), side impact sensors (rear),
driver’s seat position sensor, driver’s seat
belt buckle switch, front passenger occu-
pant classification system (ECU and sen-
sors), rear seat belt buckle switches (if
equipped), “AIR BAG ON” indicator light,
“AIR BAG OFF” indicator light, front pas-
senger’s seat belt buc kle switch, seat belt
pretensioners, airbags, interconnecting wir-
ing and power sources. ( P.29)
■If the malfunction indicator lamp comes
on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fuel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several driving
trips.
If the light does not go off even after several
trips, contact your Lexus dealer as soon as
possible.
■Electric power steering system warning
light (warning buzzer)
When the battery charge becomes insuffi-
cient or the voltage temporarily drops, the
electric power steering system warning
light may come on and the warning buzzer
may sound.
■When the tire pressure warning light
comes on
Inspect the tires to check if a tire is punc-
tured.
If a tire is punctured:  P.433
If none of the tires are punctured:
Turn the engine switch off then turn it to
IGNITION ON mode. Check if the tire
pressure warning light comes on or blinks.
If the tire pressure warning light blinks for
approximately 1 minute then stays on
There may be a malfunction in the tire
Warning lightDetails/Actions
(flashes)
Indicates a malfunction in the brake hold system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
A buzzer sounds and the warning light comes on and flashes to indicate
that the master warning system has detected a malfunction.
P.429

4317-2. Steps to take in an emergency
7
When trouble arises
In some situations, the master warning light and warning buzzer may not oper-
ate as specified. In this case, follow the instructions displayed in the warning
message.
 If a warning light comes on or flashes at the same time that a warning message is
displayed, take corrective actio n according to the warning light. ( P.419)
*: A buzzer sounds the first time a message is shown on the multi-information display.
■Warning messages
The warning messages explained below
may differ from the actual messages
according to operation conditions and vehi-
cle specifications.
■Warning buzzer
In some cases, the bu zzer may not be heard
due to being in a noisy location or audio
sound.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level is low. Check the level
of the engine oil, and add if necessary.
This message may appear if the vehicle is
stopped on a slope. Move the vehicle to a
level surface and check to see if the mes-
sage disappears.
■If “Engine Stoppe d Steering Power
Low” is displayed
This message is displa yed if the engine is
stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering wheel
firmly and operate it using more force than
usual.
■If “Auto Power Off to Conserve Battery”
is displayed
Power was turned off due to the automatic
power off function. Next time when starting
the engine, increase the engine speed
slightly and maintain that level for approxi-
mately 5 minutes to recharge the battery.
■If “Headlight System Malfunction Visit
Your Dealer” is displayed
The following systems may be malfunction-
ing. Have the vehicle inspected by your
Lexus dealer immediately.
●The LED headlight system
●AFS (Adaptive Front-lighting System)
●The automatic headlight leveling system
●AHB (Automatic High Beam)
■If “Radar Cruise Control Unavailable
See Owner's Manual” is displayed
The dynamic radar cruise control with
full-speed range system is suspended tem-
porarily or until the problem shown in the
message is re solved. (causes and coping
methods: P.197, 203)
■If “Radar Cruise Control Unavailable” is
displayed
The dynamic radar cruise control with
full-speed range system cannot be used
temporarily. Use the system when it
Comes onDoes not sound
Indicates a condition, such as malfunction of electri-
cal components, their cond ition, or indicates the
need for maintenance
FlashesDoes not sound
Indicates a situation, such as when an operation has
been performed incorrectly, or indicates how to
perform an operation correctly
Warning buzzer*Warning

4327-2. Steps to take in an emergency
becomes available again.
■If “Front Camera Unavailable” or “Front
Camera Unavailable See Owner's
Manual” is displayed
The following systems may be suspended
until the problem shown in the message is
resolved. ( P.197, 203, 425)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Dynamic radar cruise control with
full-speed range
●RSA (Road Sign Assist) (if equipped)
●AHB (Automatic High Beam)
■If “Maintenance Required Soon” is dis-
played
Indicates that all maintenance according to
the driven distance on the maintenance
schedule
* should be performed soon.
Comes on approximately 4500 miles
(7200 km) after the message has been
reset. If necessary, perform maintenance.
Please reset the message after the mainte-
nance is performed. ( P.368)
*: Refer to the separa te “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Maintenance Required Visit Your
Dealer” is displayed
Indicates that all maintenance is required to
correspond to the driven distance on the
maintenance schedule
*.
Comes on approximately 5000 miles
(8000 km) after the message has been
reset. (The indicator will not work properly
unless the message ha s been reset.) Per-
form the necessary maintenance. Please
reset the message after the maintenance is
performed. ( P.368)
*: Refer to the separa te “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Oil Maintenance Required Soon” is
displayed
Indicates that the engine oil should be
scheduled to be changed.
Check the engine oil an d change it if neces-
sary. After changing th e engine oil, make
sure to reset the message. ( P.381)
■If “Oil Maintenance Required” is dis-
played
Indicates that the engine oil should be
changed.
Check and change the en gine oil, and oil fil-
ter by your Lexus dealer. After changing the
engine oil, make sure to reset the message.
(  P.381)
■If “Shift System Malfunction Driving
Unavailable” is displayed
There is a malfunction in the shift control
system. Have the vehicle inspected by your
Lexus dealer immediately.
■If a message that indicates the need for
the shift lever operation is displayed
To prevent the shift le ver from being oper-
ated incorrectly or the vehicle from moving
unexpectedly, a message that requires shift-
ing the shift position may be displayed on
the multi-information display. In that case,
follow the instruction of the message and
shift the shift position.
■If a message that indicates the need for
visiting your Lexus dealer is displayed
The system or part shown on the
multi-information display is malfunctioning.
Have the vehicle inspected by your Lexus
dealer immediately.
■If a message that indicates the need for
referring to Owner’ s Manual is dis-
played
●If any of the following messages are
shown on the multi-information display,
follow the instructions.
• “Engine Coolant Temp High” ( P.444)
•“Battery Low” ( P.439)
• “Transmission Fluid Temp High” ( P.169)
●If any of the following messages are
shown on the multi-info rmation display, it
may indicate a malf unction. Have the
vehicle inspected by your Lexus dealer

4357-2. Steps to take in an emergency
7
When trouble arises
( P.439)
 The battery terminal connections
may be loose or corroded.
( P.385)
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.435)
One of the following may be the cause
of the problem:
 One or both of the battery terminals
may be disconnected. ( P.385)
 The battery may be discharged.
( P.439)
 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.176)
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

4377-2. Steps to take in an emergency
7
When trouble arises
■When the electronic key does not work
properly
●Make sure that the smart access system
with push-button start has not been dis-
abled at your Lexus dealer. If it has been
disabled, re-enable it.
●Check if battery-saving mode is set. If it is
set, cancel the function. (P.113)
■Unlocking the door
Use the mechanical key ( P.98) in
order to perform the following opera-
tions: 1
Pull the driver’s door handle and
insert the mechanical key.
2
Unlock the door.
3
Remove the key, return the handle,
and then pull the handle again.
■Locking the door
1
With the door open, push down the
inside lock button.
2
Close the door.
■Trunk
Turn the mechanical key clockwise to
open. ( P.65)
If the electronic key does not
o
perate properly
If communication between the
electronic key and vehicle is inter-
rupted ( P.113) or the electronic
key cannot be used because the
battery is depleted, the smart
access system with push-button
start and wireless remote control
cannot be used. In such cases, the
doors and trunk can be opened and
the engine can be started by follow-
ing the procedure below.
NOTICE
■In case of a smart access system with
push-button start malfunction or
other key-related problems
Take your vehicle with all the electronic
keys provided with your vehicle to your
Lexus dealer.
Locking and unlocking the
doors, unlocking the trunk

4387-2. Steps to take in an emergency
■Key linked functions
1
Closes the windows and the moon
roof
* or panoramic moon roof* (turn
and hold)
2
Opens the windows and the moon
roof
* or panoramic moon roof* (turn
and hold)
These settings must be customized at your
Lexus dealer.
*: If equipped
1Depress the brake pedal.
2
Touch the Lexus emblem side of the
electronic key to the engine switch.
When the electronic key is detected, a
buzzer sounds and the engine switch will
turn to IGNITION ON mode.
When the smart access system with
push-button start is deactivated in custom-
ization setting, the engine switch will turn
to ACCESSORY mode.
3Firmly depress the brake pedal and
check that is shown on the
multi-information display.
4
Press the engine switch.
In the event that the engine still cannot
be started, contact your Lexus dealer.
■Stopping the engine
Set the parking brake, shift the shift position
to P and press the engine switch as you nor-
mally do when stop ping the engine.
■Electronic key battery
As the above procedure is a temporary
measure, it is recommended that the elec-
tronic key battery be replaced immediately
when the battery is depleted. (P.403)
■Changing engine switch modes
Release the brake pe dal and press the
engine switch in step 3
above. The engine
does not start and modes will be changed
each time the switch is pressed. ( P.168)
WARNING
■When using the mechanical key and
operating the power windows or the
moon roof or panoramic moon roof
Operate the power window or the moon
roof or panoramic moon roof after
checking to make sure that there is no
possibility of any passenger having any of
their body parts caught in the window or
the moon roof or panoramic moon roof.
Also, do not allow ch ildren to operate the
mechanical key. It is possible for children
and other passengers to get caught in
the power window or the moon roof or
panoramic moon roof.
Starting the engine

4457-2. Steps to take in an emergency
7
When trouble arises
IntercoolerReservoir
“F” line
“L” line
5 Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Engine
P.445
Intercooler
Remove the engine compartment cover
and add coolant.
6 Start the engine and turn the air
conditioning system on to check
that the radiator cooling fan oper-
ates and to check for coolant leaks
from the radiator or hoses.
The fan operates when the air conditioning
system is turned on immediately after a
cold start. Confirm that the fan is operating
by checking the fan sound and air flow. If it
is difficult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fan may not oper ate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the engine immediately and
contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer.
■When adding engine coolant
Add coolant in accordance with the follow-
ing procedure.
A
B
C

4528-1. Specifications
■Oil capacity (Drain and refill [Ref-
erence
*])
*: The engine oil capacity is a reference quantity to be used when changing the
engine oil. Warm up and turn off the
engine, wait more than 5 minutes, and
check the oil level on the dipstick.
■Engine oil selection
“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil”
or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-5 multigrade
engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good starting
in cold weather.
If SAE 0W-20 is not available, SAE
5W-20 oil may be used. However, it
must be replaced with SAE 0W-20 at the next oil change.
Recommended viscosity (SAE):
Outside temperature
Oil viscosity (0W-20 is explained here
as an example):
• The 0W in 0W-20 indicates the characteristic of the oil which allows
cold startability. Oils with a lower
value before the W allow for easier
starting of the engine in cold
weather.
• The 20 in 0W-20 indicates the vis- cosity characteristic of the oil when
the oil is at high temperature. An oil
with a higher viscosity (one with a
higher value) may be better suited if
the vehicle is operated at high
speeds, or under extreme load con-
ditions.
How to read oil container label:
The International Lubricant Specifica-
tion Advisory Committee (ILSAC)
Certification Mark is added to some oil
Octane Rating91 (Research Octane Number 96) or higher
Fuel tank capacity
(Reference)21.7 gal. (82.0 L, 18.0 Imp. gal.)
Lubrication system
With filter
2WD models
6.7 qt. (6.3 L, 5.5 Imp. qt.)
AWD models
7.5 qt. (7.1 L, 6.2 Imp. qt.)
Without fil- ter
2WD models
6.1 qt. (5.8 L, 5.1 Imp. qt.)
AWD models
7.0 qt. (6.6 L, 5.8 Imp. qt.)
A

4558-1. Specifications
8
Vehicle specifications
matching quality to satisfy the above specification. Please contact your Lexus dealer for
further details.
2WD models
AWD models
*: Your Lexus vehicle is filled with “Toyota Genu ine Differential Gear Oil” at the factory.
Use Lexus approved “Toyota Ge nuine Differential Gear Oil” or an equivalent oil of
matching quality to satisfy th e above specification. Please contact your Lexus dealer for
further details.
*1: Minimum pedal clearance when depressed with a force of 112 lbf (500 N, 51 kgf) while
the engine is running.
When performing the brake pedal inspection, also be sure to check that the brake sys-
tem warning light is not illuminated when th e engine is running. (If the brake system
Rear differential
Oil capacity0.90 qt. (0.85 L, 0.75 Imp. qt.)
Oil type and viscosity*Toyota Genuine Differential gear oil LT 75W-85
GL-5 or equivalent
Oil capacity1.42 qt. (1.35 L, 1.19 Imp. qt.)
Oil type and viscosity*Toyota Genuine Differential gear oil LT 75W-85
GL-5 or equivalent
Brakes
Pedal clearance*14.8 in. (121 mm) Min.*3
4.8 in. (122 mm) Min.*4
Pedal free play0.04  0.24 in. (1  6 mm)
Brake pad wear limit0.04 in. (1 mm)
Parking brake lining wear limit0.04 in. (1 mm)
Parking brake indicator*2
When pushing the parking brake switch for 1 to 2
seconds: comes on
When pulling the parking brake switch for 1 to 2
seconds: turns off
Fluid typeFMVSS No.116 DOT 3 or SAE J1703
FMVSS No.116 DOT 4 or SAE J1704