2018 LEXUS LS500H stop start

4477-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises 2 Touch the Lexus emblem side of the
electronic key to the power switch.When the electronic key is detected, a
buzzer sounds and the power switch will
turn to ON mode.
When the smart access system with
push-button start is de activated in custom-
ization setting, the powe r 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 power switch.
In the event that the hybrid system still
cannot be started, contact your Lexus
dealer. ■
Stopping the hybrid system
Set the parking brake, shift the shift position
to P and press the power switch as you nor-
mally do when stopping the hybrid system.
■
Electronic key battery
As the above procedure is a temporary
measure, it is recomme nded that the elec-
tronic key battery be replaced immediately
when the battery is depleted. ( → P.413)
■
Changing power switch modes
Release the brake pedal and press the
power switch in step 3 above. The hybrid
system does not start and modes will be
changed each time the switch is pressed.
( → P.170) If you have a set of jumper (or booster)
cables and a second vehicle with a
12-volt battery, you can jump start your
vehicle by following the steps below. 
Method connecting jumper (or
booster) cables to the 12-volt bat-
tery
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.69)
2 Open the trunk lid and remove the
luggage mat. ( → P.348)In the event that the trunk opener cannot
be used, use the mechanical key to open
the trunk. ( → P.445)If the 12-volt battery is dis-
charged The following procedures may be
used to start the hybrid system if the
12-volt battery is discharged.
You can also call your Lexus dealer
or a qualified repair shop.
Restarting the hybrid system

454 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) coolant is unavailable.
6 Start the hybrid system 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 operate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer. 
If “Hybrid System Overheated
Reduced Output Power” is shown
on the multi-information display
1 Stop the vehicle in a safe place.
2 Stop the hybrid system and care-
fully lift the hood. 3 After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiato r) for any leaks.
Radiator
Cooling fan If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4 The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.
Reservoir
“F” line
“L” line
5 Remove the engine compartment
cover and add coolant if necessary. Water can be used in an emergency if A
B
A
B
C

4557-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises coolant is unavailable.
6 After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check for the multi-information dis-
play.
If the message does not disappear:
Stop the hybrid system and contact
your Lexus dealer.
If the message is not displayed:
The hybrid system temperature has
dropped and the vehicle may be
driven normally.However, if the message appears again fre-
quently, contact your Lexus dealer.
■
When adding engine coolant
Add coolant in accordance with the follow-
ing procedure.
1 Remove the engine compartment
cover. 2 Push the tab in and open the engine
compartment cover.
3 Remove the engine cover.
4 Remove the caps and .
5 Add coolant through the inlet of the cap
up to the “F” line , and then
replace the cap . A B
A C
A

456 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 6 Add coolant through the inlet of the cap
until it is full, and then replace the
cap .
WARNING■
When inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious
injury such as burns. ●
If steam is seen coming from under the
hood, do not open the hood until the
steam has subsided. The engine com-
partment may be very hot.●
After the hybrid system has been
turned off, check that the indicator on
the power switch and the “READY”
indicator are off.
When the hybrid system is operating,
the gasoline engine may automatically
start, or the cooling fan may suddenly
operate even if the gasoline engine
stops. Do not touch or approach rotat-
ing parts such as the fan, which may
lead to fingers or cl othing (especially a
tie, a scarf or a muffler) getting caught,
resulting in serious injury.●
Do not loosen the coolant inlet cap or
the coolant reservoir cap while the
hybrid system and radiator are hot.
High temperature steam or coolant
could spray out.
NOTICE
■
When adding engine/power control
unit coolant
Add coolant slowly after the hybrid sys-
tem has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid
system. B
B NOTICE■
To prevent damage to the cooling sys-
tem
Observe the following precautions: ●
Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.). ●
Do not use any coolant additive.

4577-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises 1 Stop the hybrid system. Set the
parking brake and shift the shift
position to P.
2 Remove the mud, snow or sand
from around the rear wheels.
3 Place wood, stones or some other
material under the rear wheels to
help provide traction.
4 Restart the hybrid system.
5 Shift the shift position to D or R and
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal. ■
When it is difficult to free the vehicle
Press the switch to turn off TRAC.If the vehicle becomes stuck Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Recovering procedure WARNING■
When attempting to free a stuck vehi-
cle
If you choose to push the vehicle back
and forth to free it, make sure the sur-
rounding area is clear to avoid striking
other vehicles, obje cts or people. The
vehicle may also lunge forward or lunge
back suddenly as it becomes free. Use
extreme caution. ■
When shifting the shift position
Be careful not to shift the shift position
with the accelerator pedal depressed.
This may lead to un expected rapid accel-
eration of the vehicle that may cause an
accident resulting in death or serious
injury.
NOTICE■
To avoid damaging the transmission
and other components ●
Avoid spinning the rear wheels and
depressing the accelerator pedal
more than necessary. ●
If the vehicle remains stuck even after
these procedures are performed, the
vehicle may require towing to be freed.

5091-1. What to do if... (Troubleshooting)
LS500h_OM_OM50F42U_(U) 509What to do if... (Troubleshooting)
( → P.447)
 It is locked automatically to prevent
theft of the vehicle. ( → P.169)
 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.153 )
 The auto power off function will be
operated if the vehicle is left in
ACCESSORY mode for a period of
time. ( → P.171)
 The seat belt reminder light is flash-
ing Are the driver and the front passenger
wearing the seat belts? ( →
P.430 )
 The parking brake indicator is on Is the parking brake released? ( →
P.181 )
Depending on the situation, other
types of warning buzzer may also
sound. ( → P.427, 437)  Did anyone inside the vehicle open
a door during setting the alarm? The sensor detects it and the alarm sounds.
( →
P.68 )
Do one of the following to deactivate
or stop the alarms:
 Unlock the doors.
 Turn the power switch to ACCES-
SORY or ON mode, or start the
hybrid system. (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.437 )
 When a warning light turns on or a
warning message is displayed, refer
to P.427, 437.
 Slow down the vehicle, drive with The steering wheel cannot be
turned after the hybrid system is
stopped
The windows do not open or
close by operating the power
window switches
The power 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

5131-1. What to do if... (Troubleshooting)
LS500h_OM_OM50F42U_(U) 513Alphabetical Index
Multi-information display .......................... 86
Parking Support Brake function (rear
pedestrians) .............................................. 295
RCD (Rear Camera Detection) .........277
RCTA .............................................................. 273
Warning message..................................... 437
Distance until next engine oil change
..................................................................... 79, 84
Do-it-yourself maintenance .................... 379
Door courtesy lights ................................... 340
Door lock
Doors................................................................ 108
Smart access system with push-button
start ................................................................... 119
Wireless remote control......................... 106
Doors
Automatic door lock ing and unlocking
system ..............................................................112
Door closer ....................................................... 111
Door glasses ................................................... 151
Door lock........................................................ 108
Open door warning bu zzer .......... 109, 111
Outside rear view mirrors ......................149
Rear door child-protectors ....................... 111
Drive distance .................................................. 88
Drive info 1/Drive info 2 .............................. 88
Driver’s seat position memory
Driving position memory.........................139
Memory recall function ............................ 142
Power easy access system .....................139
Drive-start control ........................................159
Driving
Break-in tips .................................................. 159
Correct driving posture .............................23
Driving mode select switch ..................298
Hybrid vehicle driving tips .................... 307
Procedures .................................................... 158
Winter drive tips.........................................309
Driving information display ........................ 87
Driving position memory............................139
Memory recall function ............................ 142
Power easy access system .....................139 Driving range ................................................... 88
Driving support system information display
............................................................................. 90
DRS (Dynamic Rear Steering) .............. 303
Dynamic radar cruise control with
full-speed range ............................. 247, 250
Warning message .....................................259
Dynamic Rear Steering (DRS) .............. 303 E
ECB (Electronically Controlled Brake Sys-
tem) ................................................................ 302
EDR (Event data recorder) ............................7
Elapsed time ..................................................... 88
Electric motor (traction motor) ................ 58
Electric Power Steering (EPS) .............. 303
Warning light .............................................. 430
Electronic key ................................................ 104
Battery-saving function............................ 120
If the electronic key does not operate
properly .......................................................445
Replacing the battery .................................413
Electronically Controlled Brake System
(ECB) ............................................................ 302
Electronically modulated air suspension
.......................................................................... 299
Emergency flashers .................................... 420
Emergency, in case of
If a warning buzzer sounds................... 427
If a warning light turns on....................... 427
If a warning message is displayed ..... 437
If the 12-volt battery is discharged .... 447
If the electronic key does not operate
properly .......................................................445
If the fuel filler do or cannot be opened
..........................................................................445
If the hybrid system will not start ........ 443
If you have a flat tire .................................. 442
If you lose your keys ................................. 444
If you think something is wrong.......... 426
If your vehicle becomes stuck ............. 457
If your vehicle has to be stopped in an

514 Alphabetical Index
LS500h_OM_OM50F42U_(U) emergency ................................................ 420
If your vehicle needs to be towed ..... 422
If your vehicle overheats ........................ 453
Energy monitor ....................................... 96, 97
Engine
ACCESSORY mode ...............................170
Compartment ............................................. 387
Engine compartment cover ................ 388
Engine switch................................................ 168
Hood............................................................... 385
How to start the hybrid system ........... 168
Identification number .................................461
If the hybrid system will not start ........ 443
If your vehicle has to be stopped in an
emergency ................................................ 420
Ignition switch (power switch) ............. 168
Overheating................................................. 453
Power switch ................................................ 168
Tachometer .............................................. 77, 81
Engine compartment cover ....................388
Engine coolant
Capacity ......................................................... 463
Checking .......................................................390
Preparing and checking before winter
.........................................................................309
Engine coolant temperature gauge .77, 81
Engine oil
Capacity ......................................................... 462
Checking ...................................................... 388
Preparing and checking before winter
.........................................................................309
Warning light ............................................... 428
Engine oil maintenance data .................. 390
Engine switch (power switch) ................. 168
If your vehicle has to be stopped in an
emergency ................................................ 420
EPS (Electric Power Steering) .............. 303
Warning light ...............................................430
EV drive mode................................................ 172
EV indicator ...................................................... 59
Event data recorder (EDR) ............................7 F
FCTA (Front Cross Traffic Alert) ..........227
First-aid kit storage belt ............................ 349
Flat tire
Tire pressure warning system ............. 397
Floor mats ...........................................................22
Fluid
Brake ............................................................... 465
Hybrid transmission..................................464
Washer ............................................................ 391
Footwell light ................................................. 340
Front air conditioning system ................. 323
Front Cross Traffic Alert (FCTA) ..........227
Front passenger occupant classification
system .............................................................. 40
Front seats
Adjustment ..................................................... 128
Cleaning ......................................................... 373
Correct driving posture ............................ 23
Driving position memory ........................ 139
Head restraints..............................................144
Memory recall function.............................142
Power easy access system .................... 139
Refresh system ............................................. 133
Seat heaters ..................................................336
Seat position memory .............................. 139
Seat ventilators ............................................336
Front side marker light
Light switch .................................................... 185
Replacing light bulbs ..................................417
Front turn signal lights
Replacing light bulbs ..................................417
Turn signal lever .......................................... 180
Fuel
Capacity .......................................................... 461
Fuel gauge ................................................. 77, 81
Information ....................................................470
Refueling.......................................................... 194
Type ................................................................... 461
Warning light .............................................. 430