brake light LEXUS LS500 2019 Service Manual

4237-2. Steps to take in an emergency
LS500_OM_(U)_1810 7
When trouble arises 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 steeri ng 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.429
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 wa rning light blinks for
approximately 1 minute then stays on
There may be a malfunction in the tire
pressure warning syst em. Have the vehicle
inspected by your Lexus dealer immedi-
ately. 
If the tire pressure warning light comes
on
1 After the temperature of the tires has
lowered sufficiently, check the inflation
pressure of each tire and adjust them to
the specified level.
2 If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation pres-
sure of each tire is at the specified level
and perform initialization. (  P.388)
■
The tire pressure warning light may
come on due to natural causes
The tire pressure wa rning light may come
on due to natural causes such as natural air
leaks and tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes). ■
Conditions that the tire pressure warn-
ing system may not function properly
 P.385
WARNING■
If both the ABS and the brake system
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer.
The vehicle will become extremely
unstable during br aking, and the ABS
system may fail, which could cause an
accident resulting in death or serious
injury. ■
When the electric power steering
system warning light comes on
When the light comes on yellow, the
assist to the power st eering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual. ■
If the tire pressure warning light
comes on
Be sure to observe the following precau-
tions.
Failure to do so could cause a loss of
vehicle control and result in death or
serious injury.
●
Decelerate to the lowest appropriate
speed as soon as possible. Do not
drive over 50 mph (80 km/h).
●
Check and adjust the tire inflation
pressure immediately.
●
If the tire pressure warning light comes
on even after tire inflation pressure
adjustment, it is prob able that you have
a flat tire. Have the flat tire replaced by
the nearest Lexus dealer.

424 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 WARNING●
Avoid abrupt maneuvering and brak-
ing.
If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.■
If a blowout or sudden air leakage
should occur
The tire pressure warning system may
not activate immediately. ■
Maintenance of the tires
Each tire, including the spare (if pro-
vided), should be checked monthly when
cold and inflated to the inflation pressure
recommended by the vehicle manufac-
turer on the vehicle placard or tire infla-
tion pressure label (tire and load
information label). (I f your vehicle has
tires of a different size than the size indi-
cated on the vehicle placard or tire infla-
tion pressure label [tire and load
information label], yo u should determine
the proper tire infl ation pressure for
those tires.)
As an added safety feature, your vehicle
has been equipped with a tire pressure
monitoring system (TPMS-tire pressure
warning system) that illuminates a low
tire pressure telltale (tire pressure warn-
ing light) when one or more of your tires
is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale
(tire pressure warnin g light) illuminates,
you should stop and check your tires as
soon as possible, and inflate them to the
proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire
to overheat and can lead to tire failure.
Under-inflation also reduces fuel effi-
ciency and tire tread life, and may affect
the vehicle’s handling and stopping abil-
ity. Please note that the TPMS (tire pressure
warning system) is not a substitute for
proper tire maintenance, and it is the
driver’s responsibility to maintain correct
tire pressure, even if under-inflation has
not reached the level to trigger illumina-
tion of the TPMS low tire pressure telltale
(tire pressure warning light).
Your vehicle has also been equipped with
a TPMS (tire pressure warning system)
malfunction indicator to indicate when
the system is not operating properly. The
TPMS (tire pressure warning system)
malfunction indicator is combined with
the low tire pressure telltale (tire pres-
sure warning light) . When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon subse-
quent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may
not be able to detect or signal low tire
pressure as intended.
TPMS (tire pressure warning system)
malfunctions may occur for a variety of
reasons, including the installation of
replacement or alternate tires or wheels
on the vehicle that prevent the TPMS
(tire pressure warning system) from func-
tioning properly. Always check the
TPMS (tire pressure warning system)
malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate
tires and wheels allow the TPMS (tire
pressure warning system) to continue to
function properly.
NOTICE
■
To ensure the tire pressure warning
system operates properly
Do not install tires with different specifi-
cations or makers, as the tire pressure
warning system may not operate prop-
erly.

4317-2. Steps to take in an emergency
LS500_OM_(U)_1810 7
When trouble arises (  P.435)
 The battery terminal connections
may be loose or corroded.
(  P.380)
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.431)
One of the following may be the cause
of the problem:
 One or both of the battery terminals
may be disconnected. (  P.380)
 The battery may be discharged.
(  P.435)
 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.174) 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

4518-1. Specifications
LS500_OM_(U)_1810 8
Vehicle specifications matching quality to satisfy th e 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 11 2 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 capacity 0.90 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 capacity 1.42 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 *1
4.8 in. (121 mm) Min. *3
4.8 in. (122 mm) Min. *4
Pedal free play 0.04  0.24 in. (1  6 mm)
Brake pad wear limit 0.04 in. (1 mm)
Parking brake lining wear limit 0.04 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 type FMVSS No.116 DOT 3 or SAE J1703
FMVSS No.116 DOT 4 or SAE J1704

452 8-1. Specifications
LS500_OM_(U)_1810 warning light is illumin ated, refer to P.415.)*2
: Make sure to confirm that the brake warning light (yellow) does not illuminate. (If the
brake warning light illuminates, refer to P.415.) *3
: Vehicles without Lexus Safety System + A *4
: Vehicles with Lexus Safety System + A 
19-inch tires (type A)

19-inch tires (type B)Steering Free play Less than 1.2 in. (30 mm)
Tires and wheels Tire size 245/50RF19 101W
Tire inflation pressure
(Recommended cold tire
inflation pressure) Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm 2
or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm 2
or bar)
Driving at high speeds above 118 mph (190 km/h) (in coun-
tries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm 2
or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel size 19  8J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire size 245/50RF19 101V
Tire inflation pressure
(Recommended cold tire
inflation pressure) Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm 2
or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm 2
or bar)
Driving at high speeds above 100 mph (160 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm 2
or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.

4951-1. What to do if... (Troubleshooting)
LS500_OM_(U)_1810 495What to do if... (Troubleshooting)
In this case, the engine can be started in a
temporary way. ( 
P.434 )
 Is the battery discharged?
(  P.435)
 It is locked automatically to prevent
theft of the vehicle. (  P.164)
 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.144 )
 The auto power off function will be
operated if the vehicle is left in
ACCESSORY mode for a period of
time. (  P.166)
 The seat belt reminder light is flash-
ing Are the driver and the front passenger
wearing the seat belts? ( 
P.418 )
 The parking brake indicator is on Is the parking brake released? ( 
P.174 )
Depending on the situation, other
types of warning buzzer may also sound. (  P.415, 425)
 Did anyone inside the vehicle open
a door during setting the alarm? The sensor detects it and the alarm sounds.
( 
P.65 )
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.425 )
 When a warning light turns on or a
warning message is displayed, refer
to P.415, 425.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

4971-1. What to do if... (Troubleshooting)
LS500_OM_(U)_1810 497Alphabetical Index
Alphabetical Index A
A/C
Air conditioning filter ...............................398
Front automatic air conditioning system
...........................................................................313
Micro dust and pollen filter.....................319
Rear automatic air conditioning system
......................................................................... 323
ABS (Anti-lock Brake System).............. 294
Warning light ................................................. 417
Active stabilizer suspension system .... 295
Adaptive Front-lighting System (AFS) .. 181
Adaptive Variable Suspension System295
AFS (Adaptive Front-lighting System) .. 181
Air conditioning filter ................................. 398
Air conditioning system
Air conditioning filter ...............................398
Front automatic air conditioning system
...........................................................................313
Micro dust and pollen filter.....................319
Rear automatic air conditioning system
......................................................................... 323
Airbags
Airbag operating conditions..................... 31
Airbag precautions for your child ........ 34
Correct driving posture .............................23
Curtain shield airbag operating condi-
tions ...................................................................32
Curtain shield airbag precautions ....... 34
Front passenger occupa nt classification
system ............................................................. 40
General airbag precautions ................... 34
Locations of airbags.................................... 29
Modification and disposal of airbags ..37
Side airbag operating conditions ..........32
Side airbag precautions ............................ 34
Side and curtain shield airbags operating
conditions.......................................................32
Side and curtain shield airbags precau-
tions .................................................................. 34
SRS airbags ..................................................... 29 SRS warning light........................................ 416
Alarm ................................................................... 65
Warning buzzer .......................................... 415
Anchor brackets ..................................... 46, 55
Antennas (smart acc ess system with
push-button start)..........................................111
Anti-lock Brake System (ABS).............. 294
Warning light .................................................417
Approach warning...................................... 243
Armrest............................................................ 344
Assist grips ..................................................... 344
Audio system-linked display ...................... 85
Automatic headlight leveling system ... 180
Automatic High Beam ................................182
Automatic light control system................ 179
Automatic transmission .............................. 167
M mode ............................................................ 172
Paddle shift switches ...... .......... ..........171, 172
Snow mode...................................................... 171
Auxiliary boxes ................................... 339, 341
Average fuel economy................................. 82
Average vehicle speed ................................ 82
B
Back-up lights
Replacing light bulbs ............................... 404
Battery
Battery checking ....................................... 380
If the battery is discharged ....................435
Preparing and checking before winter
......................................................................... 300
Warning light ................................................ 416
Blind Spot Monitor (BSM)....................... 250
Boost gauge...................................................... 83
Brake
Brake hold ....................................................... 177
Fluid........................................................ 379, 451
Parking brake ................................................174
Warning light ................................................ 415
Brake assist .................................................... 294
Break-in tips.................................................... 155

4991-1. What to do if... (Troubleshooting)
LS500_OM_(U)_1810 499Alphabetical Index
Display
Center Display............................................306
Dynamic radar cruise control with
full-speed range ...................................... 237
Head-up display ........................................... 87
Intuitive parking assist.............................. 257
LTA (Lane Tracing Assist)...................... 231
Multi-information display ..........................80
Parking Support Brake function (rear
pedestrians) ..............................................286
RCD (Rear Camera Detection) ........ 267
RCTA .............................................................. 263
Warning message..................................... 425
Distance until next engine oil
change ......................................................74, 79
Do-it-yourself maintenance .................... 365
Door courtesy lights .....................................331
Door lock
Doors................................................................ 100
Smart access system with push-button
start ..................................................................... 111
Wireless remote control........................... 98
Doors
Automatic door lock ing and unlocking
system ........................................................... 104
Door closer ................................................... 103
Door glasses .................................................. 142
Door lock........................................................ 100
Open door warning bu zzer ........ 101, 103
Outside rear view mirrors ..................... 140
Rear door child-protectors ................... 103
Drive distance .................................................. 82
Drive info 1/Drive info 2 .............................. 82
Driver’s seat position memory
Driving position memory........................ 130
Memory recall function ............................133
Power easy access system .................... 130
Drive-start control ....................................... 155
Driving
Break-in tips .................................................. 155
Correct driving posture .............................23
Driving mode select switch ..................289 Procedures .................................................... 154
Winter drive tips ........................................ 300
Driving information disp lay ........................ 82
Driving position memory........................... 130
Memory recall function............................ 133
Power easy access system .................... 130
Driving range ................................................... 82
Driving support system information display
............................................................................. 85
DRS (Dynamic Rear Steering) .............. 295
Dynamic radar cruise control with
full-speed range ............................. 237, 247
Warning message .....................................245
Dynamic Rear Steering (DRS) .............. 295
E
ECB (Electronically Controlled Brake Sys-
tem) ................................................................ 294
Eco Driving Indicator............................. 83, 91
Eco Driving Indicator Light ........................ 83
EDR (Event data recorder) ............................7
Elapsed time ..................................................... 82
Electric Power Steering (EPS) .............. 295
Warning light ................................................ 418
Electronic key .................................................. 96
Battery-saving function.............................. 112
If the electronic key does not operate
properly .......................................................433
Replacing the battery .............................. 399
Electronic roof sunshade
Jam protection function ........................... 149
Operation ........................................................147
Electronically Controlled Brake System
(ECB) ............................................................ 294
Electronically modulated air suspension
............................................................................291
Emergency flashers .................................... 406
Emergency, in case of
If a warning buzzer sounds.................... 415
If a warning light turns on........................ 415
If a warning message is displayed .....425
If the battery is discharged ....................435

500 Alphabetical Index
LS500_OM_(U)_1810 If the electronic key does not operate
properly....................................................... 433
If the engine will not start .......................430
If the fuel filler door cannot be opened
......................................................................... 432
If the vehicle is trapped in rising water
......................................................................... 407
If you have a flat tire .................................. 429
If you lose your keys................................. 432
If you think something is wrong ........... 413
If your vehicle becomes stuck............. 443
If your vehicle has to be stopped in an
emergency ................................................406
If your vehicle needs to be towed .....409
If your vehicle overheats ........................440
Engine
ACCESSORY mode ...............................166
Compartment ............................................. 373
Engine compartment cover ................. 374
Engine switch.................................................164
Fuel pump shut off system ...................... 414
Hood.................................................................. 371
How to start the engine............................164
Identification number ............................... 447
If the engine will not start .......................430
If your vehicle has to be stopped in an
emergency ................................................406
Ignition switch (engine switch) .............164
Overheating.................................................440
Tachometer ............................................. 73, 76
Engine compartment cover .................... 374
Engine coolant
Capacity ......................................................... 449
Checking ........................................................377
Preparing and checking before winter
........................................................................ 300
Engine coolant temperature gauge 73, 76
Engine immobilizer system ........................ 63
Engine oil
Capacity .........................................................448
Checking ....................................................... 375 Preparing and checking before winter
......................................................................... 300
Warning light ................................................ 416
Engine oil maintenance data ...................377
Engine switch ..................................................164
Auto power off function........................... 166
Changing the engine switch modes . 166
If your vehicle has to be stopped in an
emergency ................................................ 406
EPS (Electric Power Steering) .............. 295
Warning light ................................................ 418
Event data recorder (E DR) ............................7 F
FCTA (Front Cross Traffic Alert) ......... 222
First-aid kit storage belt ..............................341
Flat tire
Tire pressure warning system ............ 384
Floor mats ...........................................................22
Fluid
Automatic transmission ......................... 450
Brake ................................................................. 451
Washer ........................................................... 379
Footwell light ...................................................331
Front automatic air conditioning system
............................................................................313
Front Cross Traffic Alert (FCTA) ......... 222
Front passenger occupant classification
system .............................................................. 40
Front seats
Adjustment ....................................................... 119
Cleaning .......................................................... 361
Correct driving posture ............................ 23
Driving position memory ........................ 130
Head restraints............................................. 135
Memory recall function............................ 133
Power easy access system .................... 130
Refresh system ..............................................124
Seat heaters ..................................................326
Seat position memory .............................. 130
Seat ventilators ............................................326

504 Alphabetical Index
LS500_OM_(U)_1810 N
Navigation system-linked display.... 84, 87
Noise from under vehicle ...............................6 O
“ODO TRIP” switch ...............................74, 79
Odometer ..................................................74, 79
Odometer and trip meter display
Display items ........................................... 74, 79
“ODO TRIP” switch ............................ 74, 79
Pop-up display.......................................75, 79
Oil
Engine oil .......................................................448
Front differential oil ...................................450
Rear differential oil ......................................451
Opener
Fuel filler door............................................... 189
Hood.................................................................. 371
Trunk ................................................................. 106
Outer foot lights
Location............................................................331
Outside door handle lights........................331
Outside rear view mirrors
Adjustment..................................................... 140
BSM (Blind Sport Monitor) .................250
Folding ................................................................141
Linked mirror functi on when reversing
.......................................................................... 140
Mirror position memory.......................... 130
Outside rear view mirror defoggers
...........................................................................314
RCTA function ............................................ 263
Outside temperature.............................73, 76
Overheating .................................................. 440
P
Paddle shift switches ............................171, 172
Panic mode ....................................................... 98
Panoramic moon roof
Jam protection function............................149 Operation ........................................................147
Parking assist sensors (intuitive parking
assist) ............................................................. 257
Parking brake
Operation ........................................................174
Parking brake engaged warning buzzer
............................................................................176
Warning light ............................................... 422
Warning message .......................................176
Parking lights
Light switch .....................................................179
Replacing light bulbs ............................... 404
Parking Support Brake function (for
rear-crossing vehicles) .......................... 282
Function ..........................................................282
Parking Support Brake function (rear
pedestrians) .....................................270, 286
Function ......................................................... 286
Parking Support Brake function
(rear-crossing vehicles)......................... 270
Parking Support Brake function (static
objects) .............................................. 270, 276
Function .......................................................... 276
PCS (Pre-Collision System)
Function ............................................... 204, 215
PCS OFF switch .............................. 207, 217
Warning light .................................................421
Personal lights.................................................331
PKSA (Parking Support Alert) .............. 255
PKSB (Parking Support Brake)............. 270
Warning message ..................................... 274
Pop Up Hood................................................... 38
Power easy access system ....................... 130
Power outlets ................................................ 345
Power rear seat ..............................................126
Power steering (Elect ric power steering
system) .......................................................... 295
Warning light ................................................ 418
Power trunk opener and closer ............. 106
Power windows
Door lock linked window operation ..143
Jam protection function ............................142