Key lexus LC500 2018 Service Manual

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6-3. Do-it-yourself maintenance
Maintenance and care
The 12-volt battery is located in the
trunk.
■Before recharging
When recharging, the 12-volt battery pro- duces hydrogen gas which is flammable and explosive. Therefore, observe the fol-
lowing precautions before recharging:
●If recharging with the 12-volt battery
installed on the vehicle, be sure to discon- nect the ground cable.
●Make sure the power switch on the char-ger is off when connecting and discon-necting the charger cables to the 12-volt
battery.
■After recharging/reconnecting the 12- volt battery
●Unlocking the doors using the smart entry & start system may not be possible immediately after reconnecting the 12-
volt battery. If this happens, use the wire- less remote control or the mechanical key to lock/unlock the doors.
●Start the engine <hybrid system> with the engine switch <power switch> in ACCES-
SORY mode. The engine <hybrid sys- tem> may not start with the engine switch <power switch> turned off. However, the
engine <hybrid system> will operate nor- mally from the second attempt.
●The engine switch <power switch> mode
is recorded by the vehicle. If the 12-volt battery is reconnected, the vehicle will return the engine switch <power switch>
mode to the status it was in before the 12- volt battery was disc onnected. Make sure to turn off the engine switch <power
switch> before disconnect the 12-volt bat- tery. Take extra care when connecting the 12-volt battery if the engine switch
<power switch> mode prior to discharge is unknown.
If the engine <hybrid system> will not start even after multiple attempts at all methods above, contact any authorized Lexus
retailer or Lexus authorized repairer, or any reliable repairer.
12-volt battery
Location
WARNING
■Chemicals in the 12-volt battery
The 12-volt battery contains poisonous
and corrosive sulfuric acid and may pro- duce hydrogen gas which is flammable and explosive. To reduce the risk of death
or serious injury, take the following pre- cautions while working on or near the 12-volt battery:
●Do not cause sparks by touching the
12-volt battery terminals with tools.
●Do not smoke or light a match near the 12-volt battery.
●Avoid contact with eyes, skin and clothes.
●Never inhale or swallow electrolyte.
●Wear protective safety glasses when
working near the 12-volt battery.
●Keep children away from the 12-volt battery.
■Where to safely charge the 12-volt battery
Always charge the 12-volt battery in an open area. Do not charge the 12-volt bat-
tery in a garage or closed room where there is insufficient ventilation.

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6-3. Do-it-yourself maintenance
Maintenance and care
■If the electronic key battery is depleted
The following symptoms may occur:
●The smart entry & start system and wire- less remote control will not function properly.
●The operational range will be reduced.
Prepare the following before replacing
the battery:
 Flathead screwdriver
 Small flathead screwdriver
 Lithium battery CR2032
■Use a CR2032 lithium battery
●Batteries can be purchased at any autho-
rized Lexus retailer or Lexus authorized repairer, or any reliable repairer, local electrical appliance shops or camera
stores.
●Replace only with the same or equivalent
type recommended by the manufacturer.
●Dispose of used batteries according to
the local laws.
1 Take out the mechanical key.
2 Remove the cover.
To prevent damage to the key, wrap the tip
of the screwdriver with tape.
3 Remove the depleted battery.
Insert a new battery with the “+” terminal
facing up.
Electronic key battery
Replace the battery with a new one
if it is depleted.
Items to prepare
Replacing the battery

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6-3. Do-it-yourself maintenance
1Turn the engine switch <power
switch> off.
2 Open the fuse box cover.
Engine compartment: type A fuse
box (LC500)
Left-hand drive vehicles:
Push the tab in and lift the lid off.
Right-hand drive vehicles:
Push the tab in and lift the lid off.
WARNING
■Removed battery and other parts
These parts are small and if swallowed by
a child, they can cause choking. Keep away from children. Failure to do so could result in death or serious injury.
■Certification for the electronic key
battery
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
NOTICE
■When replacing the battery
Use a screwdriver of appropriate size. Applying excessive force may deform or
damage the cover.
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
●Always work with dry hands.Moisture may cause the battery to rust.
●Do not touch or move any other com-
ponent inside the remote control.
●Do not bend either of the battery ter- minals.
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

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7
When trouble arises
When trouble arises
7-1. Essential information
Emergency flashers ................. 360
If your vehicle has to be stopped in
an emergency.......................... 360
7-2. Steps to take in an emergency
If your vehicle needs to be towed
........................................................ 362
If you think something is wrong
........................................................ 366
Fuel pump shut off system
(LC500) ................................... 367
If a warning light turns on or a
warning buzzer sounds ....... 368
If a warning message is displayed
........................................................ 378
If you have a flat tire.................. 384
If the engine will not start
(LC500) ................................... 385
If the hybrid system will not start
(LC500h) ................................. 386
If you lose your keys ................. 388
If the fuel filler door cannot be
opened ....................................... 388
If the electronic key does not
operate properly .................... 389
If the 12-volt battery is discharged
........................................................ 392
If your vehicle overheats
(LC500) ................................... 400
If your vehicle overheats
(LC500h) ................................. 403
If the vehicle becomes stuck 407

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7-2. Steps to take in an emergency
When trouble arises
One of the following may be the cause
of the problem:
 The electronic key may not be func-
tioning properly. ( P.390)
 There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle. ( P.201)
 The engine may be flooded.
Try to restart the engine again fol-
lowing correct starting procedures.
( P.163)
 There may be a malfunction in the
engine immobilizer system.
( P.70)
 There may be a malfunction in the
shift control system.* ( P.166)
 There may be a malfunction in the
steering lock system.
*: It may not be possible to shift the shift
position from P.
One of the following may be the cause
of the problem:
 The 12-volt battery may be dis-
charged. ( P.392)
 The 12-volt battery terminal con-
nections may be loose or corroded.
( P.326)
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.
One of the following may be the cause
of the problem:
 One or both of the 12-volt battery
terminals may be disconnected.
( P.326)
 The 12-volt battery may be dis-
charged. ( P.392)
 There may be a malfunction in the
If the engine will not start
(LC500)
If the engine will not start even
though correct starting procedures
are being followed ( P.163), con-
sider each of the following points:
The engine will not start even
though the starter motor oper-
ates normally.
The starter motor turns over
slowly, the interior lights and
headlights are di m, or the horn
does not sound or sounds at a low
volume.
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.

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7-2. Steps to take in an emergency
steering lock system.
Contact any authorized Lexus retailer or
Lexus authorized repairer, or any reliable
repairer 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 proce-
dure except in cases of emergency.
1 Press the parking brake switch to
check that the parking brake is set.
( P.187)
Parking brake indicator will come on.
2Turn 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 any authorized Lexus
retailer or Lexus authorized repairer,
or any reliable repairer.
One of the following may be the cause
of the problem:
 The electronic key may not be func-
tioning properly. ( P.390)
 There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle. ( P.201)
 There may be a malfunction in the
immobilizer system. ( P.70)
 There may be a malfunction in the
shift control system.* ( P.170)
 There may be a malfunction in the
steering lock system.
 The hybrid system may be malfunc-
tioning due to an electrical problem
such as electronic key battery
depletion or a blown fuse. However,
depending on the type of malfunc-
tion, an interim measure is available
to start the hybrid system.
*: It may not be possible to shift the shift
position from P.
Starting the engine in an emer-
gency
If the hybrid system will not
start (LC500h)
Reasons for the hybrid system not
starting vary depending on the situ-
ation. Check the following and per-
form the appropriate procedure:
The hybrid system will not start
even though the correct starting
procedure is being followed.
( P.167)

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7-2. Steps to take in an emergency
1Remove the cover in the center of
the rear seat. ( P.392)
2 Pull the tab.
If you lose your keys
New genuine mechanical keys can
be made by any authorized Lexus
retailer or Lexus authorized
repairer, or any reliable repairer
using another mechanical key and
the key number stamped on your
key number plate. Keep the plate in
a safe place such as your wallet, not
in the vehicle.
NOTICE
■When an electronic key is lost
If the electronic key remains lost, the risk of vehicle theft increases significantly. Visit any authorized Lexus retailer or
Lexus authorized repairer, or any reliable repairer immediately with all remaining electronic keys that were provided with
your vehicle.
If the fuel filler door cannot
be opened
If the fuel filler door opener switch
cannot be operated, the following
procedure can be us ed to open the
fuel filler door.
Opening the fuel filler door
WARNING
■After opening the fuel filler door
Make sure to put back the cover to the
center of the rear seat. Failure to do so may cause an accident.
NOTICE
■After opening the fuel filler door
●Secure the tab in its original position.

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7-2. Steps to take in an emergency
When trouble arises
■When the electronic key does not work properly
●Make sure that the smart entry & start system has not been deactivated using the Remote Touch or at any authorized
Lexus retailer or Lexus authorized repairer, or any reliable repairer. If it is off, turn the function on.
●Check if battery-saving mode is set. If it is set, cancel the function. ( P.124)
Use the mechanical key (P.113) in
NOTICE
●Install the tab so that it does not cover
the clip installation position . Fail-
ure to do so may cause damage to the clip and make it impossible to install
the cover.
A
If the electronic key does not
operate properly
If communication between the
electronic key and vehicle is inter-
rupted ( P.124) or the electronic
key cannot be used because the
battery is depleted, the smart entry
& start system and wireless remote
control cannot be used. In such
cases, the doors and trunk can be
opened and the engine <hybrid sys-
tem> can be started by following
the procedure below.
NOTICE
■In case of a smart entry & start system malfunction or other key-related
problems
Take your vehicle with all the electronic keys provided with your vehicle, to any authorized Lexus retailer or Lexus
authorized repairer, or any reliable repairer as soon as possible.
Locking and unlocking the
doors, opening the trunk and
using the key li nked functions

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7-2. Steps to take in an emergency
order to perform the following opera-
tions:
■Locking and unlocking the door
1 Push in the depression on the front
edge of the driver’s door handle.
2 Insert the mechanical key while
pulling on the driver’s door handle.
3 Turn the key in order to perform the
following operations.
Locks both side doors
Closes the windows (turn and
hold)*
Unlocks both side doors
Opens the windows (turn and
hold)*
*: These settings must be customized at
any authorized Lexus retailer or Lexus
authorized repairer, or any reliable
repairer.
■Opening the trunk
Unlock the doors, and press the trunk
opener switch.
1 Depress the brake pedal.
2 Touch the Lexus emblem side of the
electronic key to the engine switch
<power switch>.
When the electronic key is detected, a buzzer sounds and the engine switch
<power switch> will turn to IGNITION ON mode <ON mode>.
When the smart entry & start system is deactivated in customization setting, the engine switch <power switch> will turn to
A
B
C
D
WARNING
■When using the mechanical key and operating the power windows
Operate the power window after check- ing to make sure that there is no possibil-
ity of any passenger having any of their body parts caught in the window.Also, do not allow children to operate the
mechanical key. It is possible for children and other passengers to get caught in the power window.
Starting the engine <hybrid sys-
tem>

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7-2. Steps to take in an emergency
When trouble arises
ACCESSORY mode.
3Firmly depress the brake pedal and
check that is shown on the
multi-information display.
4 Press the engine switch <power
switch>.
In the event that the engine <hybrid sys-
tem> still cannot be started, contact
any authorized Lexus retailer or Lexus
authorized repairer, or any reliable
repairer.
■Stopping the engine <hybrid system>
Set the parking brake, shift the shift position to P and press the engine switch <power switch> as you normally do when stopping
the engine <hybrid system>.
■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.349)
■Alarm (if equipped)
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechanical key when the alarm system is set, the alarm may be triggered.
■Changing engine switch <power switch>
modes
Release the brake pedal and press the
engine switch <power switch> in step 3
above. The engine <hybrid system> does not start and modes will be changed each time the
switch is pressed. ( P.165, 170)