ignition LEXUS LS500 2018 Repair Manual

4377-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 7
When trouble arises ■
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 1 Depress 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.
3 Firmly 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.162)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 passe nger 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

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

4518-1. Specifications
LS500_OM_OM50F54U_(U) 8
Vehicle specifications containers to help you select the oil you
should use.
Cooling system Capacity 
Engine
2WD models: 11.2 qt. (10.6 L, 9.3 Imp. qt.)
AWD models: 11.1 qt. (10.5 L, 9.2 Imp. qt.) 
Intercooler
4.5 qt. (4.3 L, 3.8 Imp. qt.)
Coolant type Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-silicate,
non-amine, non-nitrite, and non-borate coolant with
long-life hybrid orga nic acid technology
Do not use plain water alone.
Ignition system (spark plug) Make DENSO EC22HPR-D7
Gap 0.028 in. (0.7 mm)
NOTICE
■
Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

494 What to do if... (Troubleshooting)
LS500_OM_OM50F54U_(U) 1-1.What to do if... (Troubleshooting)
What to do if... (Troubleshooting)  If you lose your mechanical keys,
new genuine mechanical keys can
be made by your Lexus dealer.
( → P.435)
 If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( → P.435)
 Is the electronic key battery weak or
depleted? ( → P.403)
 Is the engine switch in IGNITION
ON mode? When locking the doors, turn the engine
switch off. ( →
P.162 )
 Is the electronic key left inside the
vehicle? When locking the doors, make sure that
you have the electronic key on your per-
son.
 The function may not operate prop-
erly due to the condition of the radio
wave. ( → P.108)  Is the child-protector lock set? The rear door cannot be opened from
inside the vehicle when the lock is set.
Open the rear door from outside and then
unlock the child-protector lock. ( →
P.99 )
 The function to prevent the elec-
tronic key from being left inside the
trunk will operate and you can open
the trunk as usual. Take the key out
from the trunk. ( → P.104)
 Did you press the engine switch
while firmly depressing the brake
pedal? ( → P.160)
 Is the electronic key anywhere
detectable inside the vehicle?
( → P.107)
 Is the steering wheel unlocked?
( → P.160)
 Is the electronic key battery weak or
depleted? In this case, the engine can be started in a
temporary way. ( →
P.437 )
 Is the battery discharged? If you have a problem, check the
following before contacting your
Lexus dealer.
The doors cannot be locked,
unlocked, opened or closed You lose your keys
The doors cannot be locked or
unlocked The rear door cannot be opened
The trunk lid is closed with the
electronic key left inside
If you think something is wrong The engine does not start

4951-1. What to do if... (Troubleshooting)
LS500_OM_OM50F54U_(U) 495What to do if... (Troubleshooting)
( → P.438)
 It is locked automatically to prevent
theft of the vehicle. ( → P.160)
 Is the window lock switch pressed? The power window except for the one at
the driver’s seat cannot be operated if the
window lock switch is pressed. ( →
P.141 )
 The auto power off function will be
operated if the vehicle is left in
ACCESSORY mode for a period of
time. ( → P.162)
 The seat belt reminder light is flash-
ing Are the driver and the front passenger
wearing the seat belts? ( →
P.421 )
 The parking brake indicator is on Is the parking brake released? ( →
P.170 )
Depending on the situation, other
types of warning buzzer may also
sound. ( → P.418, 428)  Did anyone inside the vehicle open
a door during setting the alarm? The sensor detects it and the alarm sounds.
( →
P.60 )
Do one of the following to deactivate
or stop the alarms:
 Unlock the doors.
 Turn the engine switch to ACCES-
SORY or IGNITION ON mode, or
start the engine. (The alarm will be
deactivated or stopped after a few
seconds.)
 Is the message displayed on the
multi-information display? Check the message on the multi-informa-
tion display. ( →
P.428 )
 When a warning light turns on or a
warning message is displayed, refer
to P.418, 428.
 Slow down the vehicle, drive with The steering wheel cannot be
turned after the engine is
stopped
The windows do not open or
close by operating the power
window switches
The engine switch is turned off
automatically
A warning buzzer sounds during
driving An alarm is activated and the
horn sounds
A warning buzzer sounds when
leaving the vehicle
A warning light turns on or a
warning message is displayed
When a problem has occurred If you have a flat tire

500 Alphabetical Index
LS500_OM_OM50F54U_(U) If the engine will not start ....................... 433
If the fuel filler door cannot be opened
......................................................................... 435
If you have a flat tire .................................. 432
If you lose your keys................................. 435
If you think something is wrong ...........416
If your vehicle becomes stuck............. 446
If your vehicle has to be stopped in an
emergency ................................................. 410
If your vehicle needs to be towed ....... 412
If your vehicle overheats ........................ 443
Engine
ACCESSORY mode ............................... 162
Compartment ..............................................377
Engine compartment cover ................. 378
Engine switch................................................ 160
Fuel pump shut off system ...................... 417
Hood................................................................ 375
How to start the engine........................... 160
Identification number ............................... 449
If the engine will not start ....................... 433
If your vehicle has to be stopped in an
emergency ................................................. 410
Ignition switch (engine switch) ............ 160
Overheating................................................. 443
Tachometer .............................................69, 72
Engine compartment cover .................... 378
Engine coolant
Capacity ...........................................................451
Checking ........................................................ 381
Preparing and checking before winter
......................................................................... 299
Engine coolant temperature gauge 69, 72
Engine immobilizer system ........................ 58
Engine oil
Capacity .........................................................450
Checking ....................................................... 379
Preparing and checking before winter
......................................................................... 299
Warning light .................................................419
Engine oil maintenance data ................... 381 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
EPS (Electric Power Steering) .............. 294
Warning light .................................................421
Event data recorder (E DR) ............................7 F
FCTA (Front Cross Traffic Alert) ...........218
First-aid kit storage belt ............................ 340
Flat tire
Tire pressure warning system ............ 388
Floor mats ...........................................................22
Fluid
Automatic transmission ..........................452
Brake ................................................................453
Washer .......................................................... 383
Footwell light ................................................. 330
Front air conditioning system ...................313
Front Cross Traffic Alert (FCTA) ...........218
Front passenger occupant classification
system .............................................................. 40
Front seats
Adjustment ....................................................... 116
Cleaning ........................................................ 365
Correct driving posture ............................ 23
Driving position memory ......................... 127
Head restraints..............................................132
Memory recall function............................ 130
Power easy access system ..................... 127
Refresh system ............................................... 121
Seat heaters ..................................................326
Seat position memory ............................... 127
Seat ventilators ............................................326
Front side marker light
Light switch .....................................................175
Replacing light bulbs ............................... 408
Front turn signal lights
Replacing light bulbs ............................... 408
Turn signal lever .......................................... 169

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

5071-1. What to do if... (Troubleshooting)
LS500_OM_OM50F54U_(U) 507Alphabetical Index
Switches
Activating the Automatic High Beam178
Automatic High Beam system..............178
Brake Hold switch ...................................... 173
Door lock switches ...................................... 98
Driving mode select switch ..................289
Driving position memory switches ..... 127
Dynamic radar cruise control with
full-speed range switch ....................... 242
Electronic roof sunshade switches ..... 144
Emergency flashers switch .................... 410
Engine switch................................................ 160
Garage door opener switches .......... 349
Heated steering wheel switch............. 326
HUD (Head-up display) switch............85
Ignition switch............................................... 160
Instrument panel light control switches71,
75
Intuitive parking assist switch...............258
Light switches ................................................ 175
LKA (Lane-Keeping A ssist) switch.. 233
LTA (Lane-Tracing Assist) switch .... 225
Meter control switches ............................... 77
Moon roof switches ................................... 142
“ODO TRIP” switch ........................... 70, 75
Outside rear view mi rror switches ..... 137
Paddle shift switches ....................... 167, 168
Panoramic moon roof switches ........... 144
Parking brake switch .................................170
PCS OFF switch ..............................203, 213
PKSB (Parking Support Brake) switch
..........................................................................272
Power door lock switch ............................ 98
Power window switches ..........................139
RCD (Rear camera detection) switch
.........................................................................268
RCTA switch................................................ 264
Rear door sunshade switch.................. 346
Rear seat heater ......................................... 324
Rear seat position memory switches.. 131
Rear seat ventilator ................................... 324
Rear sunshades switch ........................... 347 Rear window and outside rear view mir-
ror defoggers switch ............................. 313
Seat heater switches.................................326
Seat ventilator switches ..........................326
Snow mode switch......................................167
“SOS” button............................................... 355
Tilt and telescopic steering control switch
........................................................................... 135
Tire pressure warning reset switch...392
Trunk closer switch .................................... 104
Trunk opener main switch...................... 106
Trunk opener switch ................................. 102
Vehicle-to-vehicle distance switch... 242
VSC OFF switch .......................................295
Window lock switch.................................... 141
Windshield wiper and washer switch180
Windshield wiper de-icer switch.........317
T
Tachometer............................................... 69, 72
Rev indicator ................................................... 74
Rev peak............................................................ 74
Tail lights
Light switch .....................................................175
Replacing light bulbs ............................... 408
Theft deterrent system
Alarm...................................................................60
Engine immobilizer system......................58
Tire inflation pressure
Maintenance data ......................................454
Tire inflation pressure display function
......................................................................... 388
Warning light ............................................... 422
Tire information ............................................ 459
Glossary ......................................................... 462
Size ................................................................... 460
Tire identification number..................... 460
Uniform Tire Quality Grading ............. 461
Tire pressure display ... ...............................388
Tire pressure warning system
Function ......................................................... 388
Initializing........................................................392