check engine Lexus GS300 2019 Owner's Manual

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GS350_300_OM_OM30G96U_(U)
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6-3. Do-it-yourself maintenance Do-it-yourself service precautions................................ 373
Hood ............................................... 375
Positioning a floor jack ............ 376
Engine compartment ............... 378
Tires ................................................. 395
Tire inflation pressure .............. 405
Wheels ...........................................408
Air conditioning filter ................ 410
Electronic key battery................412
Checking and replacing fuses................................................414
Headlight aim (vehicles with single-beam headlights) ....... 418
Light bulbs .................................... 420
7-1. Essential information Emergency flashers .................. 426
If your vehicle has to be stopped in an
emergency .................................427
If the vehicle is trapped in rising water ................................ 428 7-2. Steps to take in an
emergency
If your vehicle needs to be towed ............................... 429
If you think something is wrong................ 435
Fuel pump shut off system...... 436
If a warning light turns on or a warning buzzer
sounds ......................................... 437
If a warning message is displayed .................................... 444
If you have a flat tire (vehicles with spare tire) ......................... 475
If you have a flat tire (vehicles without spare tire) .................. 486
If the engine will not start ........500
If the parking brake cannot be released................................ 502
If the electronic key does not operate properly..................... 504
If the vehicle battery is discharged................................. 507
If your vehicle overheats...........512
If the vehicle becomes stuck .............................................. 518
7When trouble arises

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GS350_300_OM_OM30G96U_(U)
For your information
Please note that this manual applies to all models and explains all equipment, including
options. Therefore, you may find some expl anations for equipment not installed on your
vehicle.
All specifications provided in this manual are current at the time of printing. However,
because of the Lexus policy of continual pr oduct improvement, we reserve the right to
make changes at any time without notice.
Depending on specifications, th e vehicle shown in the illustrations may differ from your
vehicle in terms of color and equipment.
Approximately five hours after the engine is turned off, you may hear sound coming from
under the vehicle for several minutes. This is the sound of a fuel evaporation leakage
check and, it does not indicate a malfunction.
A wide variety of non-genuine spare parts and accessories for Lexus vehicles are cur-
rently available in the market. You should kn ow that Toyota does not warrant these prod-
ucts and is not responsible fo r their performance, repair, or replacement, or for any
damage they may cause to, or adverse effect they may have on, your Lexus vehicle.
This vehicle should not be modified with non-genuine Lexus products. Modification with
non-genuine Lexus products could affect its performance, safety or durability, and may
even violate governmental regulations. In addition, damage or performance problems
resulting from the modification may not be covered under warranty.
The installation of a mobile two-way radio system in your vehicle could affect electronic
systems such as:
●Multiport fuel injection system/seque ntial multiport fuel injection system
●Lexus Safety System +
●Cruise control system
●Anti-lock brake system
●Vehicle dynamics integrated management
●SRS airbag system
●Seat belt pretensioner system
Be sure to check with your Lexus dealer for precautionary measures or special instruc-
tions regarding installation of a mobile two-way radio system.
Main Owner’s Manual
Noise from under vehicle after turning off the engine
Accessories, spare parts and modification of your Lexus
Installation of a mobile two-way radio system

15Pictorial index
GS350_300_OM_OM30G96U_(U)
Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 143
Locking/unlocking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 143
Opening/closing the door glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 181
Locking/unlocking by using the me chanical key . . . . . . . . . . . . . . . . . . . . . . . P. 504
Warning lights/warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 439, 446
Windshield wipers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 229
Precautions against winter season . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 304
To prevent freezing (windshield wiper de-icer)*. . . . . . . . . . . . . . . . . . . . . . . P. 322
Precautions against car wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 362
Fuel filler door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 525
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 395
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 532
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 30 4
Checking/rotation/tire pressure warning system . . . . . . . . . . . . . . . . . . . . . . P. 395
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 475, 486
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 375
Opening. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 375
Engine compartment cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 381
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 526
Coping with overheat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 512
Warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 446
Headlights/front side marker lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 222
Front turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 216
Parking lights/daytime running lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 222
Side turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 216
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Light bulbs of the exte rior lights for driving
(Replacing method: P. 420, Watts: P. 535)
*: If equipped
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331-1. For safe use
GS350_300_OM_OM30G96U_(U)
1
For safety and security
WARNING
Observe the following precautions.
Failure to do so may cause the driver’s floor mat to slip, possibly interfering with the ped-
als while driving. An unexpectedly high spee d may result or it may become difficult to
stop the vehicle. This could lead to an ac cident, resulting in death or serious injury.
■When installing the driver’s floor mat
●Do not use floor mats designed for other models or different model year vehicles,
even if they are Lexus Genuine floor mats.
●Only use floor mats designed for the driver’s seat.
●Always install the floor mat securely using the retain ing hooks (clips) provided.
●Do not use two or more floor mats on top of each other.
●Do not place the floor mat bottom-side up or upside-down.
■Before driving
●Check that the floor mat is securely fixed in
the correct place with all the provided retain-
ing hooks (clips). Be especially careful to per-
form this check after cleaning the floor.
●With the engine stopped and the shift lever in
P, fully depress each pedal to the floor to
make sure it does not interfere with the floor
mat.

711-1. For safe use
GS350_300_OM_OM30G96U_(U)
1
For safety and security
Exhaust gas precautions
Harmful substance to the human body is included in exhaust gases if inhaled.
WARNING
Exhaust gases include harmful carbon monoxi de (CO), which is colorless and odorless.
Observe the following precautions.
Failure to do so may cause exhaust gases enter the vehicle and may lead to an accident
caused by light-headedness, or may lead to death or a serious health hazard.
■Important points while driving
●Keep the trunk lid closed.
●If you smell exhaust gases in the vehicle even when the trunk lid is closed, open the
windows and have the vehicle inspected at your Lexus dealer as soon as possible.
■When parking
●If the vehicle is in a poorly ventilated area or a closed area, such as a garage, stop the
engine.
●Do not leave the vehicle with the engine running for a long time.
If such a situation cannot be avoided, park the vehicle in an open space and ensure
that exhaust fumes do not enter the vehicle interior.
●Do not leave the engine running in an area with snow build-up, or where it is snowing.
If snowbanks build up around the vehicle while the engine is running, exhaust gases
may collect and enter the vehicle.
■Exhaust pipe
The exhaust system needs to be checked periodically. If there is a hole or crack caused
by corrosion, damage to a joint or abnormal exhaust noise, be sure to have the vehicle
inspected and repaired by your Lexus dealer.

GS350_300_OM_OM30G96U_(U)
872. Instrument cluster
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Instrument cluster
*1: These lights turn on when the engine switch is turned to IGNITION ON mode toindicate that a system check is being performed. They will turn off after the engine is
started, or after a few seconds. There may be a malfunction in a system if a light does
not come on, or turn off. Have the ve hicle inspected by your Lexus dealer.
*2:On some models
*3: The light flashes or illuminates to indicate a malfunction.
*4: The light flashes to indicate a malfunction.
*5: GS350/GS300
*6:GS F
The indicators inform the driver of the op erating state of the vehicle’s various sys-
tems.
Seat belt reminder light
(  P. 439)*1Tire pressure warning light
( P. 439)
*1Master warning light
( P. 439)
(If equipped)
LKA warning light
( P. 440)
Indicators
Turn signal indicator
( P. 216) Cruise control indicator
(
 P. 274, 278)
(U.S.A.)
Headlight indicator
( P. 222)
(If equipped)
Dynamic radar cruise
control indicator
( P. 266)
(Canada)
Tail light indicator
( P. 222) Cruise control
“SET” indicator
(
 P. 266, 278)
Headlight high beam
indicator ( P. 222)
(If equipped)
LKA indicator ( P. 256)
(If equipped)
Automatic High Beam
indicator (P. 225)*1
(If equipped)
Intuitive parking assist
indicator

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GS350_300_OM_OM30G96U_(U)2. Instrument cluster
*1: Refer to the “NAVIGATION AND MU
LTIMEDIA SYSTEM OWNER’S MANUAL”.
*2: These lights turn on when the engine switch is turned to IGNITION ON mode to
indicate that a system check is being performed. They will turn off after the engine is
started, or after a few seconds. There may be a malfunction in a system if a light does
not come on, or turn off. Have the ve hicle inspected by your Lexus dealer.
*3: GS350/GS300
*4: The light flashes to indicate that the system is operating.
*5:GS F
*6: The light turns on when the system is turned off.
*7: In order to confirm operation, the BSM ou tside rear view mirror indicators illuminate
in the following situations:
• When the engine switch is in IGNITION ON mode, the BSM function is enabled
on of the multi-information display
• When the BSM function is enabled on of the multi-information display, the
engine switch is turned to IGNITION ON mode.
If the system is functioning correctly, the BSM outside rear view mirror indicators will
turn off after a few seconds.
If the BSM outside rear view mirror indicators do not illuminate or do not turn off,
there may be a malfunction in the system.
If this occurs, have the vehicle inspected by your Lexus dealer.
*8: This light illuminates on the outside rear view mirrors.
*9: This light illuminates on the center panel.
*10: When the outside temperature is approximately 37 F (3 C) or lower, the indicator
will flash for approximately 10 seconds, then stay on.

GS350_300_OM_OM30G96U_(U)
972. Instrument cluster
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Instrument cluster
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator needle of the tachometer enter the red zone, which indicates
the maximum engine speed.
●The engine may be overheating if the engine coolant temperature gauge is in the red
zone (H). In this case, immediately stop the vehicle in a safe place, and check the
engine after it has cooled completely. ( P. 512)

GS350_300_OM_OM30G96U_(U)
1052. Instrument cluster
2
Instrument cluster
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator of the tachometer enter the red zone, as it represents the
engine speed range which exceeds the maximum safe engine speed.
●In the following situations, th e engine may be overheating. In this case, immediately
stop the vehicle in a safe place, and check the engine after it has cooled completely.
(  P. 512)
• The engine coolant temperature gauge indicator ( ) is in the red zone and flash- ing.
• The engine oil temperature gauge indicator ( ) is in the red zone and flashing.

112
GS350_300_OM_OM30G96U_(U)2. Instrument cluster
■G-force display
●The G-force values may not be zero even when the vehicle is parked, such as when it is
parked on an incline.
●Depending on the vehicle usage conditions, the brake fluid pressure display may not
reach its maximum reading even though the brake pedal is fully depressed.
●If a battery terminal is disconnected and
reconnected, the steering amount display may
be disabled temporarily. Afte r driving the vehicle for a while , the display will be enabled.
■System check display
After turning the engine switch to IGNITI ON ON mode, opening image is displayed
while system operation is checked. When the system check is complete, the normal
screen will return.
■Suspension of the settings display
In the following situations, the settings disp lay using the meter control switches will be
suspended.
●When a warning message appears on the multi-information display
●When the vehicle begins to move
■Tire inflation pressure
●It may take a few minutes to display the tire inflation pressure after the engine switch is
turned to IGNITION ON mode. It may also take a few minutes to display the tire infla-
tion pressure after inflation pressure has been adjusted.
●“---” may be displayed if the tire information cannot be determined due to unfavorable
radio wave conditions.
●Tire inflation pressure changes with temperat ure. The displayed values may also be dif-
ferent from the values measured using a tire pressure gauge.
■When disconnecting and reconnecting battery terminals
The drive information will be reset.
■Liquid crystal display
 P. 96
WARNING
■Caution for use while driving
●When operating the multi-information display while driving, pay extra attention to the
safety of the area around the vehicle.
●Do not look continuously at the multi-info rmation display while driving as you may fail
to see pedestrians, objects on the road, etc. ahead of the vehicle.
■Cautions during setting up the display
As the engine needs to be operating during setting up the display, ensure that the vehi-
cle is parked in a place with adequate ventil ation. In a closed area such as a garage,
exhaust gases including harmful carbon mo noxide (CO) may collect and enter the
vehicle. This may lead to death or a serious health hazard.