2018 Lexus GS450h key battery

4557-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
Ensure that the shift lever is in P and depress the brake pedal.
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 deactivated in cus-
tomization setting, the power switch will
turn to ACCESSORY mode.
Firmly depress the brake pedal and check that is shown on the multi-
information display.
Press the power switch.
In the event that the hybrid system st ill cannot be started, contact your Lexus
dealer.
■Stopping the hybrid system
Shift the shift lever to P and press the power sw itch as you normally do when stopping the
hybrid system.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic
key battery be replaced immediately when the battery is depleted. ( →P. 382)
■Alarm
If the trunk is opened using the mechanical key when the alarm system is set, the alarm
may be triggered. ( →P. 77)
■Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and modes will be changed each time the switch is
pressed.( →P. 183)
■When the electronic key does not work properly
●Make sure that the smart access system wi th push-button start has not been deacti-
vated in the customization setting. If it is off, turn the function on.
(Customizable features: → P. 494)
●Check if battery-saving mode is set. If it is set, cancel the function. (→P. 136)
Starting the hybrid system
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457
GS450h_OM_OM30G62U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If the 12-volt battery is discharged
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.
Confirm that the electronic key is
being carried.
When connecting the jumper (or
booster) cables, depe nding on the situa-
tion, the alarm may activate and doors
locked. ( →P. 78)
Open the hood (→ P. 351), remove
the engine compartment covers
(→ P. 354) and open the fuse box
cover.
Remove all of the clips.
Push the tabs on either side to
detach the lock and lift the lid off
while pulling the lock plate.
Open the exclusive jump starting
terminal cover.
The following procedures may be used to start the hybrid system if the 12-volt
battery is discharged.
You can also call your Lexus deal er or a qualified repair shop.
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4597-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximatel y 5 minutes to recharge the 12-volt bat-
tery of your vehicle.
Open and close any of the doors of your vehicle with the power switch off.
Maintain the engine speed of the seco nd vehicle and start the hybrid system
of your vehicle by turning th e power switch to ON mode.
Make sure the “READY” indicator come s on. If the indicator does not come
on, contact your Lexus dealer.
Once the hybrid system has started, remove the jumper cables in the exact
reverse order from which they were connected.
Once the hybrid system starts, have th e vehicle inspected at your Lexus dealer
as soon as possible.
■Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.
■To prevent 12-volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
●Turn off any unnecessary electrical components when the vehicle is running at a low
speed for an extended period , such as in heavy traffic.
■Charging the 12-volt battery
The electricity stored in the 12-volt battery w ill discharge 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 12-volt battery may discharge, and the
hybrid system may be unable to start. (The 12-volt battery recharges automatically while
the hybrid system is operating.)
■When recharging or replacing the 12-volt battery
●In some cases, it may not be possible to un lock the doors using the smart access system
with push-button start when the 12-volt battery is discharged. Use the wireless remote
control or the mechanical key to lock or unlock the doors.
●The hybrid system may not start on the first attempt after the 12-volt battery has
recharged but will start normally after the second attempt. This is not a malfunction.
●The power switch mode is memorized by the vehicle. When the 12-volt battery is
reconnected, the system will retu rn to the mode it was in before the 12-volt battery was
discharged. Before disconne cting the 12-volt battery, turn the power switch off.
If you are unsure what mode the power switch was in before the 12-volt battery dis-
charged, be especially careful when reconnecting the 12-volt battery.
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524What to do if... (Troubleshooting)
GS450h_OM_OM30G62U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be made
by your Lexus dealer. ( →P. 119)
●If you lose your electronic keys, the risk of vehicle theft increases significantly.
Contact your Lexus dealer immediately. (→ P. 121)
●Is the electronic key battery weak or depleted? ( →P. 382)
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. (→P. 183)
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on your
person.
●The function may not operate properly du e to the condition of the radio wave.
(→ P. 137)
●Is the child-protector lock set?
The rear door cannot be opened from in side the vehicle when the lock is set.
Open the rear door from outside and then unlock the child-protector lock.
(→ P. 125)
●The function to prevent the electronic key from being left inside the trunk will
operate and you can open th e trunk as usual. Take the key out from the trunk.
(→ P. 130)
If you have a problem, check the foll owing 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

525What to do if... (Troubleshooting)
GS450h_OM_OM30G62U_(U)
●Did you press the power switch while firmly depressing the brake pedal? \
(→P. 182)
●Is the shift lever in P? ( →P. 184)
●Is the electronic key anywhere detectable inside the vehicle? ( →P. 135)
●Is the steering wheel unlocked? (→ P. 185)
●Is the electronic key battery weak or depleted?
In this case, the hybrid system can be started in a temporary way. ( →P. 455)
●Is the 12-volt battery discharged? ( →P. 457)
●Is the power switch in ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
power switch in ON mode ( →P. 193)
●It is locked automatically to prevent theft of the vehicle. ( →P. 184)
●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. 160)
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or ON mode (the hybrid system is not operating) for a period of time.
(→ P. 184)
If you think something is wrong
The hybrid system does not start
The shift lever cannot be shifted from P even if you depress the brake
pedal
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

530Alphabetical index
GS450h_OM_OM30G62U_(U)
Child restraint system............................ 53Booster seats, definition ....................53
Booster seats, installation....................61
Convertible seats, definition ............ 53
Convertible seats, installation .........59
Front passenger occupant classification system ......................... 46
Infant seats, definition .......................... 53
Infant seats, installation .......................59
Installing CRS with LATCH anchors .................... 58
Installing CRS with seat belts ..........59
Installing CRS with top tether strap ......................... 62
Child safety ................................................ 52 12-volt battery precautions ........................... 363, 460
Airbag precautions ..............................38
Child restraint system ......................... 53
How your child should wear the seat belt ................................... 31, 32
Installing child restraints..................... 57
Moon roof precautions.................... 165
Power window lock switch ............ 160
Power window precautions .......... 162
Rear door child-protectors ........... 125
Removed electronic key battery precautions.............. 383
Seat belt comfort guide .......................31
Seat belt extender precautions ...... 34
Seat belt precautions ..........................56
Seat heater precautions................... 301
Trunk precautions................................. 131 Child-protectors .................................... 125
Cleaning .......................................336, 340
Aluminum wheels .............................. 337
Exterior ................................................... 336
Interior .....................................................340
Seat belts.................................................. 341
Clock........................................................... 315
Coat hooks ............................................. 320
Condenser.............................................. 359
Console box ........................................... 308
Console box light ................................. 309
Consumption screen ..............................112
Coolant .................................................... 358 Capacity................................................. 475
Checking ...............................................358
Preparing and checking before winter.................................................... 276
Cooling system ..................................... 358 Hybrid system overheating ............461
Consumption screen ............................109
Cruise control Cruise control ..................................... 255
Dynamic radar cruise control with full-speed range ................... 243
Cup holders............................................ 309
Curtain shield airbags ............................36
Customizable features .......................494

532Alphabetical index
GS450h_OM_OM30G62U_(U)
Eco drive mode ..................................... 258
EDR (Event data recorder) ...................10
Electric motor (traction motor) ......... 66
Electric Power Steering (EPS) ....... 269Function ..................................................269
Warning light ...................................... 405
Warning message .............................. 410
Electronic key ........................................... 118 Battery-saving function .....................137
If the electronic key does not operate properly.............................454
Replacing the battery ...................... 382
Emergency, in case of If a warning buzzer sounds.......... 404
If a warning light turns on.............. 404
If a warning message is displayed ......................................... 410
If the 12-volt battery is discharged .........................................457
If the electronic key does not operate properly ........454
If the hybrid system will not start....................................... 450
If the parking brake cannot be released ........................452
If you have a flat tire ........................... 441
If you think something is wrong.............................................. 403
If your vehicle becomes stuck .... 466
If your vehicle has to be stopped in an emergency .............................397
If your vehicle needs to be towed ...................................... 398
If your vehicle overheats ................. 461 Emergency flashers ............................ 396
Energy monitor ........................................ 110
Engine
Accessory mode ................................ 183
Compartment ..................................... 353
Engine switch ........................................182
Hood..........................................................351
How to start the hy brid system ....182
Identification number......................... 471
Ignition switch (power switch) ..................................182
Overheating...........................................461
Power switch .........................................182
Engine compartment cover............. 354
Engine coolant ...................................... 358 Capacity................................................. 475
Checking ...............................................358
Preparing and checking before winter .................................... 276
Engine coolant temperature gauge ........................................................ 88
Engine oil ................................................. 355 Capacity................................................. 473
Checking ...............................................355
Oil level warning message .............410
Oil pressure warning message.............................410
Preparing and checking before winter .................................... 276
Engine oil maintenance data ............344
E

535Alphabetical index
GS450h_OM_OM30G62U_(U)
I/M test ..................................................... 348
Identification ............................................. 471Engine ........................................................471
Vehicle ......................................................471
Ignition switch (power switch) ......... 182 Auto power off function................... 184
Changing the power switch modes ................................................... 183
If your vehicle has to be stopped in an emergency .............................397
Starting the hybrid system .............. 183
Illuminated entry system .................... 306
Immobilizer system..................................74
Indicators .................................................... 84
Initialization Items to initialize................................. 507
Maintenance.........................................344
Moon roof .............................................. 164
Power windows ..................................... 161
Tire pressure warning system................................367
Initiators (tire pressure warning system)................................. 373
Inside door handle lights ................... 304
Inside rear view mirror .........................154
Instrument panel light control ..............91
Interior lights........................................... 304
Intuitive parking assist
*
Function*
Warning message .............................. 410 Jack
Positioning a floor jack.................... 352
Vehicle-equipped jack ................... 442
Jack handle ................................................. 442
Jam protection function Moon roof ...............................................164
Power trunk opener and closer ........................................... 130
Power windows................................... 160
Keyless entry ............................................ 135 Smart access system with push-button start....................135
Wireless remote control.................. 122
Keys .............................................................. 118 Battery-saving function .................... 137
Electronic key ......................................... 118
Engine switch ........................................182
If the electronic key does not operate properly ........ 454
If you lose your keys.................... 119, 121
Key number plate ................................. 118
Keyless entry ................................122, 135
Mechanical key...................................... 119
Power switch .........................................182
Replacing the battery ...................... 382
Warning buzzer...................................136
Wireless remote control key ......... 122
Knee airbags ............................................. 35
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*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.