2018 Lexus GS350 check engine light

418
GS350_300_GS F_OM_OM30G34U_(U)6-3. Do-it-yourself maintenance
Light bulbs
Check the wattage of the light bulb to be replaced. (
→P. 531)
→ P. 379
Front turn signal light (vehicles with single-beam headlights)
You may replace the following bulbs by yo urself. The difficulty level of replace-
ment varies depending on the bulb. If necessary bulb replacement seems diffi-
cult to perform, contact your Lexus dealer.
For more information about replacing other light bulbs, contact your Lexus
dealer.
Preparing for light bulb replacement
Removing the engine compartment covers
Bulb locations
1

4387-2. Steps to take in an emergency
GS350_300_GS F_OM_OM30G34U_(U)
■SRS warning light
This warning light system monitors the airbag sensor assembly, front impact sensors, side
impact sensors (front door), side impact se nsors (front), side impact sensors (rear),
driver’s seat position sensor, driver’s seat belt buckle switch, front passenger occupant
classification system, “AIR BAG ON” indicat or light, “AIR BAG OFF” indicator light,
front passenger’s seat belt buckle switch, seat belt pretensioner assemblies, airbags,
interconnecting wiring and power sources. (→P. 43)
■Front passenger detection sensor, seat belt reminder and warning buzzer
If luggage is placed on the front passenger seat, the front passenger detection sensor
may cause the warning light to flash and the warning buzzer to sound even if a passenger
is not sitting in the seat.
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fu el tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several driving trips.
If the light does not go off even after severa l trips, contact your Lexus dealer as soon as
possible.
■Electric power steering system warning light (warning buzzer)
When the battery charge becomes insufficien t or the voltage temporarily drops, the
electric power steering system warning li ght may come on and the warning buzzer may
sound.
■When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level. Initializing the tire
pressure warning system will not turn off the tire pressure warning light.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural air
leaks and tire inflation pressure changes caus ed by temperature. In this case, adjusting
the tire inflation pressure will turn off the warning light (after a few minutes).
■When a tire is replaced with a spare tire
The compact spare tire is not equipped with a tire pressure warning valve and transmit-
ter. If a tire goes flat, the tire pressure warning light will not turn off even though the flat
tire has been replaced with the spare tire.
■Conditions that the tire pressure wa rning system may not function properly
→ P. 398
■If the tire pressure warning light freque ntly comes on after blinking for 1 minute
If the tire pressure warning light frequently comes on after blinking for 1 minute when the
engine switch is turned to IGNITION ON mo de, have it checked by your Lexus dealer.

4607-2. Steps to take in an emergency
GS350_300_GS F_OM_OM30G34U_(U)
Indicates that engine oil level is low
This message may ap pear if the vehicle is stopped on a
slope. Move the vehicle to a level surface and check to
see if the message disappears.
A buzzer also sounds.
→ Check the level of engine oil, and add if necessary.
Indicates a malfunction in:
• The Automatic High Beam system (if equipped);
• The AFS (Adaptive Front-lighting System) (if
equipped); or
• The LED headlight system
A buzzer also sounds.
→ Have the vehicle inspected by your Lexus dealer.
(GS F for Canada only)
Indicates that the brake pads are worn out
A buzzer also sounds
→ Have the vehicle inspected visually by your Lexus
dealer.
Warning messageDetails/Actions

4817-2. Steps to take in an emergency
GS350_300_GS F_OM_OM30G34U_(U)
7
When trouble arises
Firmly tighten each wheel nut two or
three times in the order shown in the
illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
■The spare tire
●GS350/GS300: The spare tire is identifi ed by the label “TEMPORARY USE ONLY”
on the tire sidewall.
●Use the spare tire temporarily , and only in an emergency.
●Make sure to check the tire inflat ion pressure of the spare tire. (→P. 528)
■When using the spare tire
As the spare tire is not equipped with a tire pressure warning valve and transmitter, low
inflation pressure of the spare tire will not be indicated by the tire pressure warning sys-
tem. Also, if you replace the spare tire after the tire pressure warning light comes on, the
light remains on.
■When the spare tire is equipped
The vehicle may become lower when driving with the spare tire compared to when driv-
ing with standard tires.
■If you have a flat rear tire on a road covered with snow or ice (vehicles with front and
rear tires of the same size)
Install the compact spare tire on one of the front wheels of the vehicle. Perform the fol-
lowing steps and fit tire chains to the rear tires:
Replace a front tire with the compact spare tire.
Replace the flat rear tire with the tire removed from the front of the vehicle.
Fit tire chains to the rear tires.
4
WARNING
■When using the spare tire
●Remember that the spare tire provided is specifically designed for use with your vehi-
cle. Do not use your spare tire on another vehicle.
●Do not use more than one spare tire simultaneously.
●Replace the spare tire with a stan dard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.
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526
GS350_300_GS F_OM_OM30G34U_(U)8-1. Specifications
*: The fluid capacity is the quantity of reference.
If replacement is necessary, contact your Lexus dealer.
Electrical system
Battery
Open voltage at 68 °F (20 °C):12.3 V or higher
(Voltage is checked 20 minutes after the engine
and all lights are turned off.)
Charging rates5 A
Automatic transmission
Fluid capacity*
GS350 (2WD)10.0 qt. (9.5 L, 8.4 Imp.qt.)
GS350 (AWD)10.6 qt. (10.0 L, 8.8 Imp.qt.)
GS3009.2 qt. (8.7 L, 7.7 Imp.qt.)
GS F11.8 qt. (11.2 L, 9.9 Imp.qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■Automatic transmission fluid type
Using transmission fluid other than “Toyota Genuine ATF WS” may cause deterioration
in shift quality, locking up of your transm ission accompanied by vibration, and ulti-
mately damage the transmission of your vehicle.
Front differential (AWD models)
Oil capacity0.74 qt. (0.70 L, 0.62 Imp.qt.)
Oil type and viscosityToyota Genuine Differential gear oil GL-5 or equivalent
Above 0 °F (-18 °C): SAE90
Below 0 °F (-18 °C): SAE80W or SAE80W-90

578What to do if... (Troubleshooting)
GS350_300_GS F_OM_OM30G34U_(U)
●The seat belt reminder light is flashing
Are the driver and the front passe nger wearing the seat belts? (→P. 436)
●The parking brake indicator is on
Is the parking brake released? ( →P. 211)
Depending on the situation, other types of warning buzzer may also sound.
(→ P. 434, 441)
●Did anyone inside the vehicle open a door during setting the alarm?
The sensor detects it and the alarm sounds. (→ P. 74)
To stop the alarm, turn the engine switch to IGNITION ON mode or start the
engine.
●Is the electronic key left inside the vehicle or the moon roof opened?
Check the message on the multi-information display. (→ P. 441)
●When a warning light turns on or a warning message is displayed, refer to
P. 434, 441.A warning buzzer sounds during driving
An alarm is activated and the horn sounds
A warning buzzer sounds when leaving the vehicle
A warning light turns on or a warning message is displayed

584Alphabetical index
GS350_300_GS F_OM_OM30G34U_(U)
Eco drive mode ..................................... 273
Eco Driving Indicator............................. 85
Eco driving meter .................................... 92
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 289Function ................................................. 289
Warning light .......................................435
Warning message .............................. 441
Electronic key ..........................................132 Battery-saving function .................... 152
If the electronic key does not operate properly.............................. 501
Replacing the battery ........................ 410
Emergency, in case of If a warning buzzer sounds...........434
If a warning light turns on...............434
If a warning message is displayed ......................................... 441
If the electronic key does not operate properly ......... 501
If the engine will not start................ 497
If the parking brake cannot be released ....................... 499
If the vehicle battery is discharged ........................................ 504
If you have a flat tire ..............472, 483
If you think something is wrong............................................... 432
If your vehicle becomes stuck ...... 515
If your vehicle has to be stopped in an emergency .............................425
If your vehicle needs to be towed .......................................426
If your vehicle overheats ............... 509 Emergency flashers .............................424
Emergency tire puncture repair
kit ............................................................. 483
Engine Accessory mode ................................ 198
Compartment ..................................... 376
Engine switch ........................................ 197
Hood........................................................ 373
How to start the engine.................... 197
Identification number.......................520
Ignition switch (engine switch.................................... 197
Overheating........................................ 509
Engine compartment cover..............379
Engine coolant ...................................... 386 Capacity................................................. 525
Checking ...............................................386
Preparing and checking before winter .................................... 296
Engine coolant temperature gauge ................................................ 86, 94
Engine immobilizer system .................. 72
Engine oil ...................................................381 Capacity................................................. 522
Checking ................................................ 381
Oil level warning message ............. 441
Oil pressure warning message............................. 441
Preparing and checking before winter .................................... 296
E

595Alphabetical index
GS350_300_GS F_OM_OM30G34U_(U)
Tachometer ....................................... 87, 94Variable red zone................................. 97
Tail lights.....................................................216 Light switch ............................................ 216
Replacing light bulbs ........................420
Welcome light illumination control ................................................... 138
Talk switch
*
Telephone switches*
Theft deterrent system Alarm........................................................... 74
Engine immobilizer system.............. 72
Tire inflation pressure ......................... 528 Maintenance data ............................. 528
Tire inflation pressure display function ................................................394
Warning light .......................................436
Warning message .............................. 441
Tire information ..................................... 535 Glossary ................................................ 540
Size ............................................................537
Tire identification number..............537
Uniform Tire Quality Grading.............................................. 539
Tire pressure warning system ......... 394 Function ..................................................394
Initializing............................................... 395
Installing tire pressure warning valves and transmitters ................394
Registering ID codes ...................... 396
Warning light .......................................436
Warning message .............................. 441 Tires ........................................................... 393
Chains ..................................................... 298
Checking ............................................... 393
Emergency tire puncture repair kit ..............................................483
If you have a flat tire .............. 472, 483
Inflation pressure................................528
Information............................................535
Replacing ................................................472
Rotating tires ........................................ 394
Size ...........................................................528
Snow tires ............................................. 300
Spare tire.................................................472
Tire inflation pressure display function................................................ 394
Tire pressure warning system ..... 394
Warning light ....................................... 436
Warning message............................... 441
Tools ...........................................................473
Top tether strap ....................................... 68
Torque Vectoring Differential (TVD) ..................................................... 286
Total load capacity................................. 194
Towing Dinghy towing .......................................196
Emergency towing ........................... 426
Towing eyelet ...................................... 428
Trailer towing.........................................195
TRAC (Traction Control) Function ..................................................288
TRAC OFF switch ............................290
T
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.