2019 Lexus GS300 maintenance

372
GS350_300_OM_OM30G96U_(U)6-2. Maintenance
Emission inspection and maintenance (I/M)
programs
The OBD system determines that a problem exists somewhere in the emission
control system. Your vehicle may not pass the I/M test and may need to be
repaired. Contact your Lexus dealer to service the vehicle.
●When the battery is disconnected or discharged
Readiness codes that are set duri
ng ordinary driving are erased.
Also, depending on your driving habits , the readiness codes may not be com-
pletely set.
●When the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a temporary malfunction
and your vehicle may not pass the I/M test.
The error code in the OBD system will not be cleared unless the vehicle \
is driven
40 or more times.
Contact your Lexus dealer to pr epare the vehicle for re-testing.
Some states have vehicle emission inspection programs which include OBD
(On Board Diagnostics) checks. The OBD system monitors the operation of
the emission control system.
If the malfunction indicator lamp comes on
Your vehicle may not pass the I/M te st in the following situations:
When the malfunction indicator lamp still remains on after several driv-
ing trips
If your vehicle does not pass the I/M test

373
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
6
Maintenance and care
Do-it-yourself service precautions
*: Vehicles with sing
le-beam headlights
If you perform maintenance by yourself, be sure to follow the correct proce-
dure as given in these sections.
ItemsParts and tools
Battery condition
( P. 392)•Warm water• Baking soda•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( P. 391)
• FMVSS No.116 DOT 3 or SAE J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/intercooler
coolant level
( P. 388)
•“Toyota Super Long Life Coolant” or a similar high quality
ethylene glycol-based non-silicate, non-amine, non-nitrite
and non-borate coolant with long-life hybrid organic acid
technology
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with 50%
coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed with 55%
coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(  P. 383)
• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( P. 414)• Fuse with same amperage rating as original
Headlight aim*
(  P. 418)• Phillips-head screwdriver
Light bulbs
( P. 420)
• Bulb with same number and wattage rating as original
• Phillips-head screwdriver•Flathead sc rewdriver
•Wrench
Radiator and con-
denser (P. 390)
Tire inflation pres-
sure (P. 405)• Tire pressure gauge• Compressed air source
Washer fluid
( P. 394)• Water or washer fluid containing antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)

374
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
WARNING
The engine compartment contains many mechan
isms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions.
■When working on the engine compartment
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel and
battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
■When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 390)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in
your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner f ilter removed may cause excessive engine wear due to dirt
in the air.

375
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
6
Maintenance and care
Hood
Pull the hood lock release lever.
The hood will pop up slightly.
Pull up the auxiliary catch lever and
lift the hood.
Release the lock from the inside
of the vehicle to open the hood.
1
2
WARNING
■Pre-driving check
Check that the hood is fully closed and locked.
If the hood is not locked properly, it may op en while the vehicle is in motion and cause
an accident, which may result in death or serious injury.

376
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
Positioning a floor jack
◆Front
◆Rear
GS350/GS300
When using a floor jack, follow the inst
ructions in the manual provided with
the jack and perform the operation safely.
When raising your vehicle with a floor jack, position the jack correctly.
Improper placement may damage your vehicle or cause injury.
2WD models AWD models12

GS350_300_OM_OM30G96U_(U)
3776-3. Do-it-yourself maintenance
6
Maintenance and care
GS F
NOTICE
■When using a jack at the rear of the vehicle (GS F)
Do not set the jack in either of the positions
indicated by the illustration.

378
GS350_300_OM_OM30G96U_(U)6-3. Do-it-yourself maintenance
Engine compartment
GS350
Fuse boxes (
P. 414)
Battery (P. 392)
Engine oil level dipstick (P. 383)
Engine coolant reservoir (P. 388)
Engine oil filler cap ( P. 385) Brake fluid reservoir
(P. 391)
Washer fluid tank ( P. 394)
Electric cooling fans
Condenser ( P. 390)
Radiator ( P. 390)1
2
3
4
5
6
7
8
9
10

GS350_300_OM_OM30G96U_(U)
3796-3. Do-it-yourself maintenance
6
Maintenance and care
GS300
Fuse boxes (P. 414)
Battery (P. 392)
Intercooler coolant reservoir (P. 388)
Engine oil level dipstick (P. 383)
Engine oil filler cap ( P. 385) Engine coolant reservoir
(P. 388)
Brake fluid reservoir (P. 391)
Washer fluid tank ( P. 394)
Condenser ( P. 390)
Electric cooling fans
Radiator ( P. 390)1
2
3
4
5
6
7
8
9
10
11