2020 Lexus ES350 key battery

3827-2. Steps to take in an emergency
When the battery is depleted, have the
vehicle inspected at your Lexus dealer.
●Some systems may require initialization.
( P.417)
■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 di sconnecting the bat-
tery, turn the engine switch off.
If you are unsure what mode the engine
switch was in befo re 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.
• If the 20 hour rate capacity is low, even if
the time period where the vehicle is not
used is a short time, the battery may dis-
charge and engine may not be able to
start.
For details, consult your Lexus dealer.
WARNING
■When removing the battery terminals
Always remove the negative (-) terminal
first. If the positive (+) terminal contacts
any metal in the surrounding area when
the positive (+) terminal is removed, a
spark may occur, leading to a fire in addi-
tion to electrical shocks and death or
serious injury.
■Avoiding battery fires or explosions
Observe the following precautions to
prevent accidentally igniting the flamma-
ble gas that may be emitted from the bat-
tery:
●Make sure each jumper cable is con-
nected to the correct terminal and that
it is not unintentiona lly in contact with
any other than the intended terminal.
●Do not allow the other end of the
jumper cable connected to the “+” ter-
minal to come into contact with any
other parts or metal surfaces in the
area, such as brackets or unpainted
metal.
●Do not allow the + and - clamps of the
jumper cables to come into contact
with each other.
●Do not smoke, use matches, cigarette
lighters or allow open flame near the
battery.
■Battery precautions
The battery contains poisonous and cor-
rosive acidic electrol yte, while related
parts contain lead and lead compounds.
Observe the following precautions when
handling the battery:

432What 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.377)
 If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( P.377)
 Is the electronic key battery weak or
depleted? ( P.336)
 Is the engine switch in IGNITION
ON mode?
When locking the doors, turn the engine
switch off. ( P.146)
 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.107) 
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.143)
 Is the shift lever in P? ( P.147)
 Is the electronic key anywhere
detectable inside the vehicle?
( P.106)
 Is the steering wheel unlocked?
( P.144)
 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

436Alphabetical index
C
Care ...................................................... 302, 305Aluminum wheels ...................................... 302
Exterior ........................................................... 302
Interior ............................................................ 305
Seat belts....................................................... 305
Cargo capacity................................................ 141
Cargo hooks ................................................. 278
Center Display ............................................. 254
Chains .............................................................. 250
Child-protectors............................................. 98
Child restraint system................................... 42 Fixed with a LATCH system .................. 49
Fixed with a seat belt................................... 46
Front passenger occupant classification system ..............................................................37
Points to remember .....................................42
Riding with children ......................................42
Types of child restraint system installation method ........................................................... 43
Using an anchor bracket ............................ 51
Child safety ....................................................... 42 Airbag precautions...................................... 33
Battery precautions ........... 321, 382, 382
Child restraint system................................. 43
Heated steering wheel and seat heater precautions................................................268
How your child should wear the seat belt ............................................................................ 25
Moon roof precautions ............................ 127
Panoramic moon roof precautions ..... 131
Power window lock switch.....................125
Power window precautions ...................125
Rear door child-protectors ..................... 98
Removed electronic key battery precau- tions ............................................................... 337
Seat belt extender precautions ............. 25
Seat belt precautions ...................................24
Trunk precautions ........................................ 99
Cleaning.............................................. 302, 305 Aluminum wheels ...................................... 302 Exterior............................................................302
Interior ............................................................ 305
Radar sensor .....................................169, 205
Seat belts ....................................................... 305
Clock ................................................ 70, 73, 279
Coat hooks..................................................... 290
Compass ......................................................... 297
Condenser .......................................................319
Console box ...................................................276
Console box light .........................................276
Cooling system.............................................. 318 Engine overheating.................................. 383
Cornering lights ............................................ 158 Replacing light bulbs ..................................341
Cruise control Dynamic radar cruise control with full-
speed range ............................................... 193
Cup holder ......................................................276
Current fuel consumption ...........................79
Curtain shield airbags .................................. 28
Customizable features .............................. 406
D
Daytime running light system ...................156
Defogger Outside rear view mirrors..................... 262
Rear window ................................................ 262
Windshield .................................................... 262
Dimension ......................................................388
Dinghy towing................................................. 142
Display BSM (Blind Spot Monitor)....................203
Dynamic radar cruise control with full-
speed range ............................................... 193
Head-up display............................................84
Intuitive parking assist ................................ 212
LTA (Lane Tracing Assist) ..................... 187
Multi-information display ...........................77
Parking Support Brake function (rear pedestrians)............................................... 242
RCD (Rear Camera Detection) ........ 223
RCTA.................................................................219

Alphabetical index437
Warning message..................................... 364
Distance until next engine oil change71, 76
Do-it-yourself maintenance ....................308
Door courtesy lights ....................................272
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 ............................. 115
Drive-start control ........................................135
Driving................................................................134 Break-in tips ...................................................135
Correct driving posture .............................23
Driving Mode Select switch .................209
Procedures ..................................................... 134
Winter drive tips......................................... 249
Driving information display .........................79
Driving Mode Select switch.................... 209
Driving range ....................................................79
Driving support system information display ............................................................................. 82
Dynamic radar cruise control with full- speed range..................................................193Warning message.......................................201
E
Eco drive mode ............................................ 209
Eco Driving Indicator.................... 80, 81, 87
Eco Driving Indicator Light ........................ 80 EDR (Event data recorder) ............................7
Elapsed time ......................................................79
Electric Power Steering (EPS)
Function ..........................................................245
Warning light .............................................. 356
Electronic key .................................................. 92 Battery-saving function............................ 107
If the electronic key does not operate properly .......................................................378
Replacing the battery ...............................336
Electronic roof sunshade Jam protection function ........................... 130
Operation ........................................................129
Emergency, in case of If a warning buzzer sounds...................354
If a warning light turns on.......................354
If a warning message is displayed .....364
If the battery is discharged ................... 380
If the electronic key does not operate properly .......................................................378
If the engine will not start........................375
If the fuel filler do or cannot be opened
.......................................................................... 377
If the vehicle is trapped in rising water .......................................................................... 347
If you have a flat tire ................................. 368
If you lose your keys ................................. 377
If you think something is wrong..........352
If your vehicle becomes stuck ............ 385
If your vehicle has to be stopped in an emergency .................................................346
If your vehicle needs to be towed .....349
If your vehicle overheats ....................... 383
Emergency flashers .................................... 346
Engine ................................................................143 ACCESSORY mode............................... 146
Compartment............................................... 316
Engine switch .................................................143
Fuel pump shut off system.....................353
Hood ..................................................................314
How to start the engine ............................143
Identification number .............................. 389

440Alphabetical 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................................................. 143
If the electronic key does not operate properly....................................................... 378
If you lose your keys..................................377
Key number plate ......................................... 92
Keyless entry .......................................... 95, 101
Mechanical key.............................................. 92
Replacing the battery............................... 336
Warning buzzer .......................................... 106
Wireless remote control........................... 93
Knee airbags .................................................... 28
L
Lane Tracing Assist (LTA) .........................182 Operation........................................................182
Warning messages ................................... 190
Language (multi-information display) ... 82
LATCH anchors ............................................. 49
Lever Auxiliary catch lever ...................................314
Hood lock release lever...........................314
Internal trunk release lever .................... 103
Shift lever.......................................................... 147
Turn signal lever ............................................ 151
Wiper lever...................................................... 161
Lexus climate concierge . ......................... 259
Lexus Enform Safety Connect.................. 54
Lexus Safety System + 2.0 ........................169 Automatic High Beam ............................. 159
Dynamic radar cruise control with full-speed range ................................................193
LTA (Lane Tracing Assist)......................182
PCS (Pre-Collision System).................. 175 RSA (Road Sign Assist)............................. 191
License plate lights........................................156 Light switch .................................................... 156
Replacing light bulbs ..................................341
Light bulbs Replacing .........................................................341
Wattage ..........................................................394
Lights Automatic High Beam system ............. 159
Front interior lights .................................... 273
Front personal lights................................. 273
Headlight switch.......................................... 156
Interior lights list .......................................... 272
Interior lights ................................................. 272
Rear interior lights ..................................... 273
Rear personal lights .................................. 273
Trunk light ....................................................... 103
Turn signal lever ............................................ 151
Vanity lights .................................................. 279
Wattage ..........................................................394
Welcome light illumination control ....157
Lock steering column ..................................144
Low profile tire.............................................. 323
LTA (Lane Tracing Assist) .........................182 Operation ....................................................... 182
Warning messages.................................... 190
Luggage mat ................................................. 278
M
Maintenance Do-it-yourself maintenance ...................312
General maintenance ............................ 308
Maintenance data ..................................... 388
Maintenance requirements ..................307
Malfunction indicator la mp ..................... 355
Master warning light ....................................361
Menu icons........................................................ 78
Meter Changing the main meter location.......77
Clock.......................................................... 70, 73
Indicators...........................................................68
Instrument panel light control......... 72, 76

442Alphabetical index
Parking brake engaged warning buzzer...........................................................................153
Warning light ...............................................360
Warning message.......................................153
Parking lights ...................................................156 Light switch .................................................... 156
Parking Support Brake function (rear- crossing vehicles) ..........................226, 238
Parking Support Brake function (rear pedestrians) ..................................... 226, 242Function .......................................................... 242
Parking Support Brake function (static objects) .............................................. 226, 232Function .......................................................... 232
PCS (Pre-Collision System) ..................... 175 Function ............................................................ 175
PCS OFF switch .......................................... 177
Warning light ...............................................360
Personal lights................................................272
PKSA (Parking Support Alert) ................. 211
PKSB (Parking Support Brake)............. 226 Warning message..................................... 230
Power easy access system ......................... 114
Power outlet .................................................. 279
Power steering (Elect ric power steering
system).......................................................... 245 Warning light ...............................................356
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) ..................... 175 Function ............................................................ 175
PCS OFF switch .......................................... 177
Warning light ...............................................360
R
Radar cruise control (dynamic radar cruise control with full-speed range)...............193
Radiator .............................................................319 RCD (Rear Camera Detection) ........... 223
Function .......................................................... 223
Warning message ..................................... 224
RCTA (Rear Cross Traffic Alert) ...........219
RCTA Function ............................................................219
Warning message .....................................220
Rear Cross Traffic Alert (RCTA) ...........219
Rear door sunshades .................................288
Rear seats Head restraints............................................... 117
Rear side marker lights ...............................156 Light switch .................................................... 156
Rear sunshades ............................................288
Rear turn signal lights ................................... 151 Replacing light bulbs ..................................341
Turn signal lever ............................................ 151
Rear view mirror Inside rear view mirror ............................. 120
Outside rear view mirrors........................ 121
Rear window defogger ............................. 262
Refueling ........................................................... 167 Capacity ........................................................ 389
Fuel types ...................................................... 389
If the fuel filler do or cannot be opened
.......................................................................... 377
Opening the fuel tank cap ......................167
Remote Touch .............................................. 254
Replacing Electronic key battery ..............................336
Fuses................................................................ 338
Light bulbs .......................................................341
Tires ................................................................. 368
Resetting the message indicating mainte- nance is required ...................................... 307
Rev indicator .................................................... 75
Rev peak............................................................. 75
Road Sign Assist ............................................. 191
RSA (Road Sign Assist) ............................... 191S
SCB (Secondary Collision Brake) ....... 245

446Alphabetical index
Airbags ...........................................................355
Approach warning......................................199
Brake hold.......................................................361
Brake Override System .........................356
Brake system ............................................... 354
Charging system .......................................355
Downshifting ........................................ 150, 151
Drive-Start Control ..................................356
Electric power steering ..........................356
Engine .............................................................355
High coolant temperature .................... 354
Intuitive parking assist................... 218, 358
Low engine oil pressure.........................355
LTA (Lane Tracing Assist)......... 182, 358
Open door.............................................. 96, 98
Open hood...................................................... 98
Open trunk ...................................................... 98
Open window ...............................................125
PKSA (Parking Support Alert) ............. 212
PKSB (Parking Support Brake) .........359
Pre-collision braking.................................. 175
RCD (Rear Camera Detection) ........359
RCTA (Rear Cross Traffic Alert) ......359
Seat belt .......................................................... 357
Warning lights............................................... 354 ABS ..................................................................356
Brake hold operated indicator .............361
Brake Override System .........................356
Brake system ............................................... 354
Charging system .......................................355
Drive-Start Control ..................................356
Electric power steering ..........................356
High coolant temperature .................... 354
Intuitive parking assist OFF indicator........................................................................ 358
Low engine oil pressure.........................355
Low fuel level ............................................... 357
LTA indicator .............................................. 358
Malfunction indicator lamp...................355
Master warning light ..................................361
Parking brake indicator ..........................360
PKSB OFF indicator ................................359 Pre-collision system................................. 360
RCD OFF indicator................................. 359
RCTA OFF indicator .............................. 359
Seat belt reminder light...........................357
Slip indicator ................................................ 360
SRS ................................................................... 355
Tire pressure ............................................... 358
Warning messages ..................................... 364
Washer ............................................................... 161 Checking .........................................................321
Preparing and checking before winter.......................................................................... 249
Switch.................................................................. 161
Washing and waxing.................................. 302
Weight Cargo capacity .............................................. 141
Load limits ........................................................ 141
Weight............................................................ 388
Wheel lock key............................................. 369
Wheels ............................................................. 333 Size ....................................................................393
Window lock switch .....................................125
Windows ........................................................... 124
Power windows ............................................124
Rear window defogger........................... 262
Washer .............................................................. 161
Windshield wiper de-icer ........................ 265
Windshield wipers ......................................... 161 Position............................................................. 165
Rain-sensing windshield wipers ............ 161
Winter driving tips....................................... 249
Wireless charger ...........................................281
Wireless remote control ............................. 93 Battery-Saving Function.......................... 107
Locking/Unlocking ..................................... 93
Replacing the battery ...............................336
For information regarding the equipment listed below, refer to