2019 Lexus GS350 key battery

500
GS350_300_OM_OM30G96U_(U)7-2. Steps to take in an emergency
If the engine will not start
One of the following may be the cause of the problem:
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
●The engine may be flooded.
Try to restart the engine again follo
wing correct starting procedures.
( P. 203)
●There may be a malfunction in th e engine immobilizer system. (P. 77)
One of the following may be the cause of the problem:
●The battery may be discharged. ( P. 507)
●The battery terminal connections may be loose or corroded.
The engine starting system may be malfun ctioning due to an electrical problem
such as electronic key battery depletio n or a blown fuse. However, an interim
measure is available to start the engine. ( P. 501)
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. 507)
●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.
If the engine will not start even though correct starting procedures are being
followed (P. 203), consider each of the following points:
The engine will not start even thoug h the starter motor operates nor-
mally.
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 headlights
do not turn on, or the horn does not sound.

504
GS350_300_OM_OM30G96U_(U)7-2. Steps to take in an emergency
If the electronic key does not operate properly
■Doors
Use the mechanical key (
P. 139)
in order to perform the following
operations:
Locks all the doors
Closes the windows and moon
roof
* (turn and hold)
Unlocks the door
Turning the key rearward unlocks the
driver’s door. Turning the key once
again within 5 seconds unlocks the
other doors.
Opens the windows and moon roof* (turn and hold)
*: This setting must be custom ized at your Lexus dealer.
■Trunk
Turn the mechanical key clockwise
to open.
If communication between the electronic key and vehicle is interrupted
( P. 158) or the electronic key ca nnot be used because the battery is
depleted, the smart access system with push-button start and wireless
remote control cannot be used. In su ch cases, the doors and trunk can be
opened and the engine can be started by following the procedure below.
Locking and unlocking the doors, unlocking the trunk and key linked
functions
1
2
3
4

5067-2. Steps to take in an emergency
GS350_300_OM_OM30G96U_(U)
■Stopping the engine
Shift the shift lever to P and press the engine switch as you normally do when stopping
the engine.
■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. 412)
■Alarm
If the trunk is opened using the mechanical key when the alarm system is set, the alarm
may be triggered. ( P. 79)
■Changing engine switch modes
Release the brake pedal and press the engine switch in step above.
The engine does not start and modes will be changed each time the switch is
pressed.( P. 204)
■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. 549)
●Check if battery-saving mode is set. If it is set, cancel the function. (P. 157)
WARNING
■When using the mechanical key and operating the power windows or moon roof
Operate the power window or moon roof afte r checking to make sure that there is no
possibility of any passenger having any of their body parts caught in the window or
moon roof.
Also, do not allow children to op erate the mechanical key. It is possible for children and
other passengers to get caught in the power window or moon roof.
3

507
GS350_300_OM_OM30G96U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If the vehicle 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 electron ic key is being carried.
When connecting the jumper (or booster) cables, depending on the situation, the
alarm may activate and doors locked. ( P. 80)
Open the hood. ( P. 375)
GS300/GS F: Remove the engine cover.
The following procedures may be used to start the engine if the vehicle’s bat-
tery is discharged.
You can also call your Lexus deal er or a qualified repair shop.
1
GS350/GS300GS F
2
3
GS300GS F
Raise the front of the engine cover to
remove the front clips, and then raise
the rear of the engine cover to
remove the rear clips.

5107-2. Steps to take in an emergency
GS350_300_OM_OM30G96U_(U)
■Starting the engine when the battery is discharged
The engine cannot be started by push-starting.
■To prevent battery discharge
●Turn off the headlights and the audio system while the engine 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 battery
The electricity stored in the battery will disc harge gradually even when the vehicle is not
in use, due to natural discharge and the draini ng effects of certain electrical appliances. 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 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 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 discharged.
Before disconnecting the battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery discharged, be
especially careful when reconnecting the battery.

580What to do if... (Troubleshooting)
GS350_300_OM_OM30G96U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, ne w genuine mechanical keys can be made
by your Lexus dealer. ( P. 140)
●If you lose your electronic keys, the risk of vehicle theft increases significantly.
Contact your Lexus dealer immediately. ( P. 141)
●Is the electronic key battery weak or depleted? ( P. 412)
●Is the engine switch in IGNITION ON mode?
When locking the doors, turn the engine switch off. (P. 204)
●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. 158)
●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. 146)
●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. 151)
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

581What to do if... (Troubleshooting)
GS350_300_OM_OM30G96U_(U)
●Did you press the engine switch while firmly depressing the brake pedal?
( P. 203)
●Is the shift lever in P? ( P. 205)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 156)
●Is the steering wheel unlocked? ( P. 205)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a temporary way. (P. 505)
●Is the battery discharged? ( P. 507)
●Is the engine switch in IGNITION ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
engine switch in IGNITION ON mode ( P. 214)
●It is locked automatically to prevent theft of the vehicle. ( P. 205)
●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. 181)
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or IGNITION ON mode (the engine is not running) for a period of
time. (P. 205)
If you think something is wrong
The engine 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 engine is stopped
The windows do not open or close by operating the power window
switches
The engine switch is turned off automatically

585Alphabetical index
GS350_300_OM_OM30G96U_(U)
Approach warning............................... 273
Armrest .................................................... 346
Armrest door ......................................... 349
ASC (Active Sound Control) ........... 221
Ashtrays.................................................... 345
Assist grips ..............................................350
Audio input
*
Audio system*
Automatic headlight leveling system .................................................... 224
Automatic light control system....... 222
Automatic transmission .....................208 If the shift lever cannot be shifted from P .....................................214
M mode ..................................................... 211
Paddle shift switches ......................... 210
AUX port
*
Auxiliary boxes ........................................341
AVS (Adaptive Variable Suspension system).......................... 297
Back-up lights Replacing light bulbs ........................ 422
Battery....................................................... 392
Battery checking................................... 392 If the vehicle battery is discharged ........................................ 507
Preparing and checking before winter ................................................... 304
Warning light ....................................... 437 Blind Spot Monitor (BSM) ............... 286
Blind Spot Monitor function.........289
Rear Cross Traffic Alert function.................................................. 291
Bluetooth
®*
Brake Fluid ............................................................391
Parking brake ........................................ 217
Warning light ........................... 437, 439
Warning message............................. 444
Brake assist ..............................................296
Brake Hold................................................ 219
Break-in tips .............................................189
Brightness control Instrument panel light control.......................................... 95, 103
BSM (Blind Spot Monitor) ............... 286 Blind Spot Monitor function.........289
Rear Cross Traffic Alert function.................................................. 291
Card key ....................................................138
Care................................................360, 364 Aluminum wheels ................................361
Exterior ...................................................360
Interior ..................................................... 364
Seat belts................................................365
Cargo capacity ..................................... 200
Cargo hooks ...........................................342
CD player
*
Chains ....................................................... 306
BC
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.