
370 6-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 Tire inflation pres-
sure ( P.395) • Tire pressure gauge
•Compressed air
source
Washer fluid
( P.379) • Water or washer
fluid containing anti-
freeze (for winter
use)
• Funnel (used only for
adding water or
washer fluid)
WARNING
The engine compartment contains many
mechanisms and fluids that may move
suddenly, become hot, or become elec-
trically energized. To avoid death or seri-
ous injury, observe the following
precautions. ■
When working on the engine com-
partment●
Keep hands, clothi ng and tools away
from the moving fan and engine drive
belt.●
Be careful not to touch the engine,
radiator, exhaust manifold, etc. right
after driving as they may be hot. Oil
and other fluids may also be hot.
●
Do not leave anything that may burn
easily, such as paper and rags, in the
engine compartment.
●
Do not smoke, cause sparks or expose
an open flame to fuel. Fuel fumes are
flammable.
■
When working near the electric cool-
ing fan or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION
ON mode, the electric cooling fan may
automatically start to run if the air condi-
tioning is on and/or the coolant tempera-
ture is high. ( P.378)Items Parts and tools ■
Safety glasses
Wear safety glasses to prevent flying or
falling material, fluid spray, etc. from get-
ting in your eyes.
NOTICE■
If you remove the air cleaner filter
Driving with the air cleaner filter
removed may cause excessive engine
wear due to dirt in the air.

3736-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 6
Maintenance and care
Fuse boxes ( P.401)
Engine oil filler cap ( P.376)
Engine coolant reservoir ( P.377)
Intercooler coolant reservoir ( P.377)
Engine oil level dipstick ( P.375)
Brake fluid reservoir ( P.379)
Washer fluid tank ( P.379)
Radiator ( P.378)
Intercooler radiator ( P.378)
Electric cooling fan
Condenser ( P.378)
Intercooler sub radiator ( P.378)For AWD models:
The engine oil level dipstick is locate d on the opposite side of the engine.Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
K
L

3756-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 6
Maintenance and care ■
Removing the service cover
1 Pull up the passenger side end of
the rubber strip to disengage it
from the vehicle body.
2 Remove the service cover.Push the tabs and lift away the service
cover.
■
Installing the service cover
1 Install the service cover.Make sure to engage the claws on the
windshield side of the service cover when
installing the service cover. 2 Engage the rubber strip to the vehi-
cle body.
With the engine at operating tempera-
ture and turned off, check the oil level
on the dipstick. ■
Checking the engine oil
1 Park the vehicle on level ground.
After warming up the engine and
turning it off, wait more than 5 min-
utes for the oil to drain back into the
bottom of the engine.
2 Holding a rag under the end, pull
the dipstick out.
2WD models
AWD modelsService cover NOTICE■
Checking the service cover after
installation
Make sure that the cover is securely
installed in its original position.
Checking and adding the engine
oil

376 6-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 3 Wipe the dipstick clean.
4 Reinsert the dipstick fully.
5 Holding a rag under the end, pull
the dipstick out and check the oil
level.
Low
Normal
ExcessiveThe shape of the dipstick may differ
depending on the type of vehicle or
engine.
6 Wipe the dipstick and reinsert it
fully. ■
Checking the oil type and prepar-
ing the item needed
Make sure to check the oil type and
prepare the items needed before add-
ing oil.
Engine oil selection
P.448 Oil quantity (Low Full)
1.6 qt. (1.5 L, 1.3 Imp. qt.)
Item
Clean funnel ■
Adding engine oil
If the oil level is below or near the low
level mark, add engine oil of the same
type as that already in the engine.
2WD models
AWD models
1 Remove the oil filler cap by turning
it counterclockwise.
2 Add engine oil slowly, checking the
dipstick.
3 Install the oil filler cap by turning it
clockwise. ■
Engine oil consumption
A certain amount of engine oil will be con-
sumed while driving. In the following situa-
tions, oil consumption may increase, and A
B
C

3776-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 6
Maintenance and care engine oil may need to be refilled in
between oil maintenance intervals. ●
When the engine is new, for example
directly after purchasing the vehicle or
after replacing the engine●
If low quality oil or oil of an inappropriate
viscosity is used●
When driving at high engine speeds or
with a heavy load, or when driving while
accelerating or decelerating frequently●
When leaving the engine idling for a long
time, or when driving frequently through
heavy traffic■
After changing the engine oil
The engine oil maintena nce data should be
reset. Perform the following procedures:
1 Press or of the meter control
switch to select .
2 Press or to select “Vehicle Set-
tings” and then press .
3 Press or to select “Oil Mainte-
nance” and then press .
4 Press or to select “Yes” and
then press .
A message will be displayed on the
multi-information disp lay when the reset
procedure has been completed.
The coolant level is satisfactory if it is
between the “F” and “L” lines on the
reservoir when the engine is cold. ■
Engine coolant reservoir
Reservoir capWARNING
■
Used engine oil●
Used engine oil contains potentially
harmful contaminants which may
cause skin disorders such as inflamma-
tion and skin cancer, so care should be
taken to avoid prolonged and
repeated contact. To remove used
engine oil from your skin, wash thor-
oughly with soap and water. ●
Dispose of used oil and filters only in a
safe and acceptable manner. Do not
dispose of used oil and filters in house-
hold trash, in sewers or onto the
ground.
Call your Lexus dealer, service station
or auto parts store for information
concerning recycling or disposal. ●
Do not leave used engine oil within the
reach of children.
NOTICE■
To prevent serious engine damage
Check the oil level on a regular basis. ■
When replacing the engine oil ●
Be careful not to spill engine oil on the
vehicle components. ●
Avoid overfilling, or the engine could
be damaged. ●
Check the oil level on the dipstick
every time you re fill the vehicle.●
Be sure the engine o il filler cap is prop-
erly tightened.
Checking the coolant
A

394 6-3. Do-it-yourself maintenance
LS500_OM_(U)_1810 into contact with the disc wheel.
Disc wheel
Washer
3 Lower the vehicle.
4 Firmly tighten each wheel nut two
or three times in the order shown in
the illustration.
Tightening torque:
103 ft•lbf (140 N•m, 14.3 kgf•m) A
B WARNING■
When installing the tire
Failure to follow these precautions could
cause the wheel nuts to loosen and the
tire to fall off, result ing in death or serious
injury. ●
Never use oil or grease on the wheel
bolts or wheel nuts.
Oil and grease may cause the wheel
nuts to be excessively tightened, lead-
ing to bolt or disc wheel damage. In
addition, the oil or grease can cause
the wheel nuts to loosen and the wheel
may fall off, causing a serious accident.
Remove any oil or grease from the
wheel bolts or wheel nuts. ●
Have the wheel nuts tightened with a
torque wrench to 103 ft•lbf (140 N•m,
14.3 kgf•m) as soon as possible after
changing wheels. ●
Do not attach a heavily damaged
wheel ornament, as it may fly off the
wheel while the vehicle is moving. ●
When installing a tire, only use wheel
nuts that have been specifically
designed for that wheel. ●
If there are any cracks or deformations
in the bolt screws, nut threads or bolt
holes of the wheel, have the vehicle
inspected by your Lexus dealer.
NOTICE
■
Repairing or replac ing tires, wheels,
tire pressure warning valves, trans-
mitters and tire valve caps
P.387

416 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 ■
Charging system warning light *
(warning buzzer)*
: This light illuminates on the multi-information display. ■
Low engine oil pressure warning light *
(warning buzzer)*
: This light illuminates on the multi-information display. ■
Malfunction indicator lamp (warning buzzer)
■
SRS warning light (warning buzzer) Warning light Details/Actions
Indicates a malfunction in the vehicle’s charging system
Immediately stop the vehicle in a safe place and contact your Lexus
dealer.
Warning light Details/Actions
Indicates that the engine oil pressure is too low
Immediately stop the vehicle in a safe place and contact your Lexus
dealer.
Warning light Details/Actions
(U.S.A.)
or
(Canada) Indicates a malfunction in:
The electronic engine control system;
The electronic throttle control system; or
The electronic automatic transmission control system
Immediately stop the vehicle in a safe place and contact your Lexus
dealer.
Warning light Details/Actions
Indicates a malfunction in:
The SRS airbag system;
The front passenger occupant classification system; or
The seat belt pr etensioner system
Have the vehicle inspected by your Lexus dealer immediately.

4277-2. Steps to take in an emergency
LS500_OM_(U)_1810 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.415)*
: 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 Bat-
tery” 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.196, 202)
■
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 on Does not sound Indicates a condition, such as malfunction of electri-
cal components, their cond ition, or indicates the
need for maintenance
Flashes Does not sound Indicates a situation, such as when an operation has
been performed incorrectly, or indicates how to
perform an operation correctlyWarning buzzer *
Warning