key battery LEXUS ES350 2021 Owner's Manual

3857-2. Steps to take in an emergency
7
When trouble arises
The battery terminal connections
may be loose or corroded.
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 battery terminals
may be disconnected.
 The battery may be discharged.
( P.389)
 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: 1
Press the parking brake switch to
check that the parking brake is set.
(P.154)
Parking brake indicator will come on.
2 Shift the shift lever to P.
3 Turn the engine switch to ACCES-
SORY mode.
4 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
headlights do not turn on, or the
horn does not sound.
Starting the engine in an emer-
gency

3877-2. Steps to take in an emergency
7
When trouble arises
■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 func-
tion on.
●Check if battery-saving mode is set. If it is
set, cancel the function. ( P.107)
Use the mechanical key ( P.94) in
order to perform the following opera-
tions:
■Unlocking the door
1 Pull the driver’s door handle and
insert the mechanical key.
2 Unlock the door.
3 Remove the key, return the handle,
and then pull the handle again.
■Locking the door
1 With the door open, push down the
inside lock button.
2 Close the door.
■Opening the trunk
Turn the mechanical key clockwise to
If the electronic key does not
operate properly
If communication between the
electronic key and vehicle is inter-
rupted ( P.108) 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 can be started by follow-
ing the procedure below.
NOTICE
■In case of a smart access system with
push-button start malfunction or
other key-related problems
Take your vehicle with all the electronic
keys 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

3897-2. Steps to take in an emergency
7
When trouble arises
4Press the engine switch shortly and
firmly.
In the event that the engine still cannot
be started, contact your Lexus dealer.
■Stopping the engine
Set the parking brake, shift the shift lever to
P and press the engine switch as you nor-
mally do when stopping the engine.
■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.341)
■Changing engine switch modes
Release the brake pedal 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.147)
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 using the following procedure.
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.64)
2 Open the hood. ( P.316)
3 Connect a positive jumper cable clamp to on your vehicle and connect the
clamp on the other end of the positive cable to on the second vehicle.
Then, connect a negative cable clamp to on the second vehicle and con-
nect the clamp at the other end of the negative cable to .
If the battery is discharged
The following procedures may be
used to start the engine if the bat-
tery is discharged.
You can also call your Lexus dealer
or a qualified repair shop.
Restarting the engine
A
B
C
D

3917-2. Steps to take in an emergency
7
When trouble arises
ing parts as shown in the illustration
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.
Once the engine starts, have the vehicle
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 stopped.
●Turn off any unnecessary electrical com-
ponents when the vehicle is running at a
low speed for an extended period, such
as in heavy traffic.
■When the battery is removed or dis-
charged
●Information stored in the ECU is cleared.
When the battery is depleted, have the
vehicle inspected at your Lexus dealer.
●Some systems may require initialization.
(  P.430)
■When removing the battery terminals
When the battery terminals are removed,
the information stored in the ECU is
cleared. Before removi ng the battery termi-
nals, contact your Lexus dealer.
■Charging the battery
The electricity stored in the battery will dis-
charge gradually even when the vehicle is
not in use, due to natural discharge and the
draining effects of certain electrical appli-
ances. If the vehicle is left for a long time,
the battery may discharge, and the engine
may be unable to start. (The battery
recharges automatically during driving.)
■When recharging or replacing the bat-
tery
●In some cases, it may not be possible to
unlock the doors using the smart access
system with push-button start when the
battery is discharged. Use the wireless
remote control or the mechanical key to
lock or unlock the doors.
●The engine may not start on the first
attempt after the battery has recharged
but will start normally after the second
attempt. This is not a malfunction.
●The engine switch mode is memorized by
the vehicle. When the battery is recon-
nected, the system will return to the
mode it was in before the battery was dis-
charged. Before disconnecting the bat-
tery, turn the engine switch off.
If you are unsure wh at mode the engine
switch was in before the battery dis-
charged, be especially careful when
reconnecting the battery.
■When replacing the battery
●Use a battery that conforms to European
regulations.
●Use a battery that the case size is same as
the previous one (LN3), 20 hour rate
capacity (20HR) is equivalent (70Ah) or
greater, and performance rating (CCA)
is equivalent (592A) or greater.
• If the sizes differ, the battery cannot be properly secured.
• Battery performance may decrease and
the engine may not be able to start.

446What to do if... (Troubleshooting)
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.386)
 If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( P.386)
 Is the electronic key battery weak or
depleted? ( P.341)
 Is the engine switch in IGNITION
ON mode?
When locking the doors, turn the engine
switch off. ( P.147)
 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.98)
 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.103)
 Did you press the engine switch
while firmly depressing the brake
pedal? ( P.144)
 Is the shift lever in P? ( P.149)
 Is the electronic key anywhere
detectable inside the vehicle?
( P.106)
 Is the steering wheel unlocked?
( P.145)
 Is the electronic key battery weak or
depleted?
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

Alphabetical index451
change ....................................................... 71, 76
Do-it-yourself maintenance ..................... 310
Door courtesy lights ....................................274
Door lock Doors.................................................................. 95
Smart access system with push-button start ................................................................. 106
Wireless remote control........................... 93
Doors ................................................................... 95 Automatic door lock ing and unlocking
system ............................................................. 98
Door glasses .................................................. 124
Door lock.......................................................... 95
Open door warning buzzer .......... 96, 98
Outside rear view mirrors ........................121
Rear door child-protectors ..................... 98
Drive distance ...................................................79
Drive info 1/Drive info 2 ...............................79
Driver’s seat position memory .................. 114 Driving position memory...........................114
Memory recall function ............................. 116
Drive-start control ........................................135
Driving................................................................134 Break-in tips ...................................................135
Correct driving posture .............................23
Driving Mode Select switch...................210
Procedures ..................................................... 134
Winter drive tips...........................................251
Driving information display .........................79
Driving Mode Select switch......................210
Driving range ....................................................79
Driving support system information display ............................................................................. 82
Dynamic radar cruise control with full- speed range..................................................195Warning message..................................... 203
Dynamic Torque Control AWD system .......................................................................... 246
E
Eco drive mode ..............................................210
Eco Driving Indicator.................... 80, 81, 87 Eco Driving Indicator Light ........................ 80
EDR (Event data recorder) ............................7
Elapsed time ......................................................79
Electric Power Steering (EPS)
Function .......................................................... 246
Warning light ...............................................363
Electronic key .................................................. 92 Battery-saving function............................ 107
If the electronic key does not operate properly .......................................................387
Replacing the battery .................................341
Electronic roof sunshade Jam protection function ........................... 130
Operation ........................................................129
Emergency, in case of If a warning buzzer sounds.................... 361
If a warning light turns on........................ 361
If a warning message is displayed .......371
If the battery is discharged ................... 389
If the electronic key does not operate properly .......................................................387
If the engine will not start....................... 384
If the fuel filler do or cannot be opened
......................................................................... 386
If the vehicle is trapped in rising water ..........................................................................353
If you have a flat tire ..................................375
If you lose your keys ................................ 386
If you think something is wrong......... 359
If your vehicle becomes stuck ............ 395
If your vehicle has to be stopped in an emergency .................................................352
If your vehicle needs to be towed .... 355
If your vehicle overheats ........................393
Emergency flashers .................................... 352
Engine ................................................................144 ACCESSORY mode................................147
Compartment............................................... 318
Engine switch .................................................144
Fuel pump shut off system.................... 360
Hood ................................................................. 316
How to start the engine ............................144

454Alphabetical index
K
Keyless entrySmart access system with push-button start ................................................................. 106
Wireless remote control........................... 93
Keys...................................................................... 92 Battery-saving function ............................107
Electronic key ................................................. 92
Engine switch................................................. 144
If the electronic key does not operate properly....................................................... 387
If you lose your keys.................................386
Key number plate ......................................... 92
Keyless entry .......................................... 95, 101
Mechanical key.............................................. 92
Replacing the battery.................................341
Warning buzzer .......................................... 106
Wireless remote control........................... 93
Knee airbags .................................................... 28
L
Lane Tracing Assist (LTA) ........................ 184 Operation....................................................... 184
Warning messages .................................... 192
Language (multi-information display) ... 82
LATCH anchors ............................................. 50
Lever Auxiliary catch lever ...................................316
Hood lock release lever...........................316
Internal trunk release lever .................... 103
Shift lever..........................................................149
Turn signal lever ...........................................153
Wiper lever.....................................................164
Lexus climate concierge ............................ 261
Lexus Enform Safety Connect.................. 55
Lexus Safety System + 2.0 ......................... 171 Automatic High Beam ............................... 161
Dynamic radar cruise control with full-speed range ............................................... 195
LTA (Lane Tracing Assist)..................... 184
PCS (Pre-Collision System).................. 177 RSA (Road Sign Assist)........................... 193
License plate lights....................................... 158 Light switch .................................................... 158
Replacing light bulbs ................................346
Light bulbs Replacing .......................................................346
Wattage ..........................................................407
Lights Automatic High Beam system ............... 161
Front interior lights .................................... 275
Front personal lights................................. 275
Headlight switch.......................................... 158
Interior lights list .......................................... 274
Interior lights ................................................. 274
Rear interior lights ..................................... 275
Rear personal lights .................................. 275
Trunk light ....................................................... 103
Turn signal lever .......................................... 153
Vanity lights ................................................... 281
Wattage ..........................................................407
Welcome light illumination control ... 159
Lock steering column ..................................145
Low profile tire.............................................. 326
LTA (Lane Tracing Assist) ........................ 184 Operation ....................................................... 184
Warning messages.....................................192
Luggage mat .................................................280
M
Maintenance Do-it-yourself maintenance ...................314
General maintenance .............................. 310
Maintenance data ..................................... 398
Maintenance requirements ................. 309
Malfunction indicator la mp ..................... 362
Master warning light .................................. 368
Menu icons........................................................ 78
Meter Changing the main meter location.......77
Clock.......................................................... 70, 73
Indicators...........................................................68
Instrument panel light control......... 72, 76

456Alphabetical index
Parking brake engaged warning buzzer.......................................................................... 155
Warning light ............................................... 367
Warning message...................................... 155
Parking lights .................................................. 158 Light switch .................................................... 158
Parking Support Brake function (rear- crossing vehicles) .......................... 227, 239
Parking Support Brake function (rear pedestrians) ..................................... 227, 243Function .......................................................... 243
Parking Support Brake function (static objects) .............................................. 227, 233Function .......................................................... 233
PCS (Pre-Collision System) ..................... 177 Function ............................................................ 177
PCS OFF switch .......................................... 179
Warning light ............................................... 367
Personal lights................................................274
PKSA (Parking Support Alert) ................ 212
PKSB (Parking Support Brake)..............227 Warning message....................................... 231
Power easy access system ......................... 114
Power outlet ....................................................281
Power steering (Elect ric power steering
system).......................................................... 246 Warning light ............................................... 363
Power trunk lid ................................................ 99
Power windows .............................................. 124 Door lock linked window operation..125
Jam protection function............................125
Operation........................................................ 124
Window lock switch ..................................125
Pre-Collision System (PCS) ..................... 177 Function ............................................................ 177
PCS OFF switch .......................................... 179
Warning light ............................................... 367
R
Radar cruise control (dynamic radar cruise control with full-speed range)...............195
Radiator ........................................................... 322 RCD (Rear Camera Detection) ........... 224
Function .......................................................... 224
Warning message ..................................... 225
RCTA (Rear Cross Traffic Alert) ......... 220
RCTA Function ..........................................................220
Warning message ....................................... 221
Rear Cross Traffic Alert (RCTA) ......... 220
Rear door sunshades ................................. 290
Rear seats Head restraints............................................... 117
Rear side marker lights .............................. 158 Light switch .................................................... 158
Rear sunshades ............................................ 290
Rear turn signal lights ..................................153 Replacing light bulbs ................................346
Turn signal lever .......................................... 153
Rear view mirror Inside rear view mirror ............................. 120
Outside rear view mirrors........................ 121
Rear window defogger ............................. 264
Refueling ...........................................................169 Capacity ........................................................ 400
Fuel types ...................................................... 400
If the fuel filler do or cannot be opened
......................................................................... 386
Opening the fuel tank cap ..................... 169
Remote Touch .............................................. 256
Replacing Electronic key battery ................................341
Fuses................................................................. 342
Light bulbs .....................................................346
Tires ..................................................................375
Resetting the message indicating mainte- nance is required ...................................... 309
Rev indicator .................................................... 75
Rev peak............................................................. 75
Road Sign Assist ............................................193
RSA (Road Sign Assist) ..............................193S
SCB (Secondary Collision Brake) ....... 246

460Alphabetical index
Brake Override System ......................... 363
Brake system .................................................361
Charging system ....................................... 362
Downshifting ....................................... 152, 152
Drive-Start Control .................................. 363
Electric power steering .......................... 363
Engine ............................................................. 362
High coolant temperature ......................361
Intuitive parking assist................... 219, 365
Low engine oil pressure......................... 362
LTA (Lane Tracing Assist)......... 184, 365
Open door..............................................96, 98
Open hood...................................................... 98
Open trunk ...................................................... 98
Open window ...............................................125
PKSA (Parking Support Alert) ............. 213
PKSB (Parking Support Brake) .........366
Pre-collision braking.................................. 177
RCD (Rear Camera Detection) ........366
RCTA (Rear Cross Traffic Alert) ......366
Seat belt .......................................................... 364
Warning lights.................................................361 ABS .................................................................. 363
Brake hold operated indicator ...........368
Brake Override System ......................... 363
Brake system .................................................361
Charging system ....................................... 362
Drive-Start Control .................................. 363
Electric power steering .......................... 363
High coolant temperature ......................361
Intuitive parking assist OFF indicator.........................................................................365
Low engine oil pressure......................... 362
Low fuel level ............................................... 364
LTA indicator ...............................................365
Malfunction indicator lamp................... 362
Master warning light ................................368
Parking brake indicator .......................... 367
PKSB OFF indicator ................................366
Pre-collision system ................................. 367
RCD OFF indicator .................................366
RCTA OFF indicator...............................366 Seat belt reminder light...........................364
Slip indicator ................................................. 367
SRS ....................................................................362
Tire pressure ............................................... 365
Warning messages ....................................... 371
Washer ..............................................................164 Checking .......................................................325
Preparing and checking before winter........................................................................... 251
Switch................................................................ 164
Washing and waxing.................................. 304
Weight Cargo capacity .............................................. 141
Load limits ........................................................ 141
Weight............................................................ 398
Wheel lock key............................................. 376
Wheels ............................................................. 338 Size ................................................................... 405
Window lock switch .....................................125
Windows ........................................................... 124 Power windows ............................................124
Rear window defogger........................... 264
Washer ............................................................ 164
Windshield wiper de-icer ........................ 268
Windshield wipers ........................................164 Position..............................................................167
Rain-sensing windshield wipers .......... 164
Winter driving tips.........................................251
Wireless charger ......................................... 283
Wireless remote control ............................. 93 Battery-Saving Function.......................... 107
Locking/Unlocking ..................................... 93
Replacing the battery .................................341
For information regarding the equipment listed below, refer to
the “NAVIGATION AND MUL-
TIMEDIA SYSTEM OWNER’S
MANUAL”.