
3116-3. Do-it-yourself maintenance
6
Maintenance and care
LC500hThe 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 
access system with pu sh-button start may 
not be possible immediately after recon-
necting the 12-volt battery. If this hap-
pens, use the wireless remote control or 
the mechanical key to lock/unlock the 
doors.
●Start the engine 
engine switch 
SORY mode. The engine 
engine 
mally from the second attempt.
●The engine switch 
is recorded by the vehicle. If the 12-volt 
WARNING
■When adding washer fluid
Do not add washer fluid when the engine 
and may catch fire if spilled on the engine 
etc.
NOTICE
■Do not use any fluid other than 
washer fluid
Do not use soapy water or engine anti-
freeze instead of washer fluid.
Doing so may cause streaking on the 
vehicle’s painted surfaces, as well as 
damaging the pump leading to problems 
of the washer fluid not spraying.
■Diluting washer fluid
Dilute washer fluid with water as neces-
sary. 
Refer to the freezing temperatures listed 
on the label of the washer fluid bottle.
12-volt battery
Location 

3306-3. Do-it-yourself maintenance
■If the electronic key battery is depleted
The following symptoms may occur:
●The smart access syst em with push-but-
ton start and wireless remote control will 
not function properly.
●The operational rang e will be reduced.
■When the card key battery needs to be 
replaced (if equipped)
The battery for th e card key is available only 
at Lexus dealers. Your Lexus dealer can 
replace the battery for you.
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 your Lexus 
dealer, 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 screwdri ver with tape.
3Remove the depleted battery using 
a small flathead screwdriver.
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 

337
7
7
When trouble arises
When trouble arises
7-1. Essential informationEmergency flashers.................. 338
If your vehicle has to be stopped in  an emergency .......................... 338
If the vehicle is trapped in rising  water............................................ 339
7-2. Steps to take in an emergency If your vehicle needs to be towed......................................................... 341
If you think something is wrong ........................................................ 345
Fuel pump shut off system  (LC500).................................... 346
If a warning light turns on or a  warning buzzer sounds ....... 347
If a warning message is displayed ........................................................ 356
If you have a flat tire.................. 362
If the engine will not start  (LC500).................................... 363
If the hybrid system will not start  (LC500h) ................................. 364
If you lose your keys ................. 366
If the fuel filler door cannot be  opened........................................ 366
If the electronic key does not  operate properly .................... 367
If the 12-volt battery is discharged ........................................................ 369
If your vehicle overheats  (LC500).................................... 376If your vehicle overheats 
(LC500h)................................. 379
If the vehicle becomes stuck 382 

3597-2. Steps to take in an emergency
7
When trouble arises
■If a message that indicates the need for the shift lever operation is shown
To prevent the shift lever from being operated incorrectly or the vehicle from moving unex-
pectedly, a message that requires  shifting the shift lever may be shown on the multi-informa-
tion display. In that case, follow the instruction of the me ssage and shift the shift lever.
■If a message that indicates the malfunction of front camera is displayed
The following systems may be suspended un til the problem shown in the message is 
resolved. ( P.198, 347)
●PCS (Pre-Collision System)
●LKA (Lane-Keeping Assist)
●Automatic High Beam
●Dynamic radar cruise control with full-speed range
■If “Engine Stopped Steering  Power Low” (LC500) or “H ybrid System Stopped Steer-
ing Power Low” (LC500h) is shown
The steering wheel may become extremely heavy. If the steering wheel becomes heavier 
than usual when operating, hold firmly and operate using more force than usual.
■If “Warming Up Maximum Vehicle Speed: 65MPH” is shown (LC500h)
The transmission is being warmed up and the ve hicle is unable to be driven over 65 mph 
(110 km/h). Wait until th e transmission warms up.
■If “Stop the vehicle in a safe place Shift to P position” is shown (LC500h)
There may be a malfunction in th e hybrid system or the shift position may be shifted to N for 
a long time. Immediately stop the vehicle and contact your Lexus dealer.
■If “Oil Maintenance Required Soon” is shown (LC500h)
The engine oil is scheduled to be changed. Check the engine oil, and change if necessary. 
After changing the engine oil,  the message should be reset. (P.295)
■If “Maintenance Required Soon” is shown
Indicates that all maintenance according to th e driven distance on the maintenance sched-
ule
* should be performed soon. The message  is shown approximately 4500 miles (7200 
km) after the message has been reset. If necessary, perform maintenance.
*: Refer to the separate “Sched uled Maintenance” or “Owner’s  Manual Supplement” for the 
maintenance interval app licable to your vehicle.
■If “Engine Oil Level Low Add or Replace” is shown
The engine oil level is low. Chec k the level of 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 message disappears.
■If a message that indicates the need for referring to Owner’s Manual is shown
●If any of the following messages is shown on  the multi-information display, follow the 
instructions.
• “Engine Coolant Temp High” ( P.376, 379)
•“Battery low” ( P.369)
• “Transmission Fluid Temp High” ( P.163, 170)
●If any of the following messages is shown on the multi-information di splay, it may indicate 
a malfunction. Have the vehicle inspected by your Lexus dealer immediately.
• “Access System with  Elec. Key Malfunction” 

3637-2. Steps to take in an emergency
7
When trouble arises
One of the following may be the cause 
of the problem:
The electronic key may not be func-
tioning properly. ( P.368)
 There may not be sufficient fuel in 
the vehicle’s tank.
Refuel the vehicle. ( P.191)
 The engine may be flooded.
Try to restart the engine again fol-
lowing correct starting procedures. 
( P.152)
 There may be a malfunction in the 
engine immobilizer system. 
( P.70)
 There may be a malfunction in the 
shift control system.
* ( P.155)
 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.369)
 The 12-volt battery terminal con-
nections may be lo ose or corroded. 
( P.313)
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.313)
 The 12-volt battery may be dis-
charged. ( P.369)
 There may be a malfunction in the 
steering lock system.
If the engine will not start 
(LC500)
If the engine will not start even 
though correct starting procedures 
are being followed ( P.152), 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 dim, 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. 

3647-2. Steps to take in an emergency
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:
1Press the parking brake switch to 
check that the parking brake is set. 
(P.176)
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. One of the following may be the cause 
of the problem:
The electronic key may not be func-
tioning properly. ( P.368)
 There may not be sufficient fuel in 
the vehicle’s tank.
Refuel the vehicle. ( P.191)
 There may be a malfunction in the 
immobilizer system. ( P.70)
 There may be a malfunction in the 
shift control system.
* ( P.160)
 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.156) 

3667-2. Steps to take in an emergency
1Remove the cover in the center of 
the rear seat. ( P.369)
2 Pull the tab.
LC500h: Using the tab to open the 
fuel filler door may not allow for an 
adequate reduction in fuel tank pres-
sure before refuelin g. To prevent fuel 
from spilling out, turn the cap slowly 
when removing it.
During refueling, fuel may spill out from 
If you lose your keys
New genuine mechanical keys can 
be made by your Lexus dealer 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 your Lexus deal er immediately with 
all remaining electronic keys and the 
card key that were provided with your 
vehicle.
If the fuel filler door cannot 
be opened
LC500:
If the fuel filler door opener switch 
cannot be operated, the following 
procedure can be used to open the 
fuel filler door.
LC500h:
If the fuel filler door opener switch 
cannot be operated, contact your 
Lexus dealer to service the vehicle. 
In case where refueling is urgently 
necessary, the following procedure 
can be used to open the fuel filler 
door.
Opening the fuel filler door 

3677-2. Steps to take in an emergency
7
When trouble arises
the filler opening due to air being dis-
charged from inside the fuel tank. 
Therefore, fill the fuel tank carefully and 
slowly.
■When the electronic key does not work 
properly
●Make sure that the smart access system 
with push-button start has not been deac-
tivated using the Remote Touch or at your 
Lexus dealer. If it is off, turn the function 
on.
●Check if battery-saving mode is set. If it is 
set, cancel the function. ( P.119)
Use the mechanical key ( P.108) in 
order to perform th e following opera-
tions:
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.
●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.119) or the electronic 
key cannot be used because the 
battery is depleted, the smart 
access system with push-button 
start and wireless remote control 
cannot be used. In such cases, the 
doors and trunk can be opened and 
the engine 
started by following the procedure 
below.
NOTICE
■In case of a smart access system with 
push-button start malfunction or 
other key-rela ted problems
Take your vehicle with all the electronic 
keys (including the card key) provided 
with your vehicle to your Lexus dealer as 
soon as possible.
Locking and unlocking the 
doors, opening the trunk and 
using the key linked functions