2008 Lexus GS350 battery

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1-5. Refueling
1
Before driving
GS_G_U
May 13, 2008 5:14 pm
Closing the fuel tank capAfter refueling, turn the fuel tank
cap clockwise until you hear a
click. The cap will revolve slightly in
the opposite direction once
released.
■Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)
■Fuel tank capacity
Approximately 18.7 gal. (71 L, 15.6 lmp.gal.)
■When the fuel filler door opener switch is inoperable
The lever can be used to open the fuel filler
door if the fuel filler door cannot be opened
using the inside switch because the 12 volt
battery is discharged or for any other reason.

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1-6. Theft deterrent system
GS_G_U
May 13, 2008 5:14 pm
■Items to check before locking the vehicle
To prevent unintended triggering of the alarm and vehicle theft, make sure of the
following.
●Nobody is in the vehicle.
●The windows and moon roof (if equipped) are closed before the alarm is set.
●No valuables or other personal items are left in the vehicle.
■Tr i g g e r i n g o f t h e a l a r m
The alarm may be triggered in the following situations. 
(Stopping the alarm deactivates the alarm system.)
●A person inside the vehicle opens a door, the trunk or hood.
●The 12 volt battery is recharged or replaced when the vehicle is locked.
■When the 12 volt battery is disconnected
Be sure to cancel the alarm system. 
If the 12 volt battery is disconnected before canceling the alarm, the system may be
triggered when the battery is reconnected.
■Pa n i c m o d e
When is pushed for longer than about
one second, the headlights/tail lights/emer-
gency flashers will flash, the front and rear
interior lights will come on, and an alarm will
sound for about 60 seconds to deter any
person from trying to break into or damage
your vehicle.
To stop the alarm, push any button on the
wireless remote control.

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1-7. Safety information
GS_G_U
May 13, 2008 5:14 pm
■When to contact your Lexus dealer
In the following cases, contact your Lexus dealer as soon as possible. Do not dis-
connect the 12 volt battery cables before contacting your Lexus dealer.
●Any of the SRS airbags have been inflated.
●The front of the vehicle is damaged or
deformed, or was involved in an accident
that was not severe enough to cause the
SRS airbags to inflate.
●A portion of the doors is damaged or
deformed, or the vehicle was involved in an
accident that was not severe enough to
cause the SRS side airbags and curtain
shield airbags to inflate.
●The pad section of the steering wheel, front
passenger airbag cover or lower portion of
the instrument panel is scratched, cracked,
or otherwise damaged.
●The surface of the seats with the side air-
bag is scratched, cracked, or otherwise
damaged.
●The portion of the front pillars, rear pillars
or roof side rail garnishes (padding) con-
taining the curtain shield airbags inside is
scratched, cracked, or otherwise dam-
aged.

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2-1. Driving procedures
2
When driving
GS_G_U
May 13, 2008 5:14 pm
■If the engine does not start
The immobilizer system may not have been deactivated. (P. 7 3 )
■When the steering lock cannot be released
■When the “ENGINE START STOP” switch indicator flashes in amber
The system may be malfunctioning. Have the vehicle inspected by your Lexus
dealer immediately.
■Auto power OFF function
If the vehicle is left in the ACCESSORY mode for more than an hour with the shift
lever in “P”, the “ENGINE START STOP” switch will automatically turn OFF.
■Electronic key battery depletion
P. 2 8
■When the electronic key battery is discharged
P. 4 4 0
■Conditions affecting operation
P. 2 6
■Leak detection pump
Several hours after the engine is turned off, you may hear a sound coming from
underneath the luggage compartment for several minutes. This is normal operation
and does not indicate a malfunction.
The green indicator light on the “ENGINE
START STOP” switch will flash and a mes-
sage will be shown on the multi-information
display. Press the “ENGINE START STOP”
switch again while turning the steering wheel
left and right.

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2-1. Driving procedures
GS_G_U
May 13, 2008 5:14 pm
CAUTION
■When starting the engine
Always start the engine while sitting in the driver’s seat. Do not press the accelera-
tor pedal while starting the engine under any circumstances. 
Doing so may cause an accident resu lting in death or serious injury.
■Stopping the engine in an emergency
If you want to stop the engine in an emergency while driving the vehicle, push and
hold the “ENGINE START STOP” switch for more than 3 seconds. 
However, do not touch the “ENGINE START STOP” switch while driving except in
an emergency. If the engine stops while the vehicle is being driven, this could lead to
an unexpected accident.
NOTICE
■To prevent 12 volt battery discharge
Do not leave the “ENGINE START STOP” switch in ACCESSORY or IGNITION
ON mode for long periods if the engine is not running.
■When starting the engine
●Do not race the engine.
●If the engine becomes difficult to start or stalls frequently, have the engine
checked immediately.

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2-3. Operating the lights and windshield wipers
GS_G_U
June 5, 2008 10:37 am
■Automatic light off system
The headlights and tail lights turn off 30 seconds after all doors are closed if the
“ENGINE START STOP” switch has been switched to ACCESSORY mode or
turned OFF while the headlights are turned on. (The lights turn off immediately if
the button on the key is pressed after all doors are locked.)
To turn the lights on again, switch to IG NITION ON mode, or turn the light switch
off once and then back to the or position.
■Automatic headlight leveling system
The level of the headlights is automatica lly adjusted according to the number of
passengers and the loading condition of the vehicle to ensure that the headlights do
not interfere with other road users.
■If the indicator flashes...
It may indicate a malfunction in the system. Contact your Lexus dealer.
■Customization that can be configured at Lexus dealer
Settings (e.g. light sensor sensitivity) can be changed. 
(Customizable features P. 5 7 2 )
NOTICE
■To prevent 12 volt battery discharge
Do not leave the lights on longer than necessary when the engine is off.

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2-5. Driving information
2
When driving
GS_G_U
May 13, 2008 5:14 pm
Winter driving tips
Carry out the necessary preparations and inspections before driving the
vehicle in winter. Always drive the vehicle in a manner appropriate to the
prevailing weather conditions.
■ Pre-winter preparations
●Use fluids that are appropria te to the prevailing outside tempera-
tures.
• Engine oil
• Engine coolant
• Washer fluid
● Have a service technician inspect th e level and specific gravity of
battery electrolyte.
● Have the vehicle fitted with four snow tires or purchase a set of
tire chains for the rear tires.
Ensure that all tires are the same si ze and brand, and that chains match
the size of the tires.
■ Before driving the vehicle
Perform the following according to the driving conditions.
● Do not try to forcibly open a w indow or move a wiper that is fro-
zen. Pour warm water over the frozen area to melt the ice. Wipe
away the water immediately to prevent it from freezing.
● To ensure proper operation of the climate control system fan,
remove any snow that has accumulated on the air inlet vents in
front of the windshield.
● Remove any ice that has accumul ated on the vehicle chassis.
● Periodically check for and remove any excess ice or snow that
may have accumulated in the wheel well or on the brakes.

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3-2. Using the air conditioning system and defogger
GS_G_U
May 13, 2008 5:14 pm
■Automatic mode for air intake control
In automatic mode, the system detects exhaust gas and other pollutants and auto-
matically switches between outside air and recirculated air modes.
When the air conditioning is off, and the fa n is operating, turning the auto mode ON
will activate the air conditioning system.
■Micro dust and pollen filter
●In order to prevent the windows from fogging up when the outside air is cold,
the following may occur.
• Outside air mode does not switch to .
• The air conditioning syst em operates automatically.
• The operation cancels after 1 minute.
●In rainy weather, the windows may fog up. Press .
■When the indicator light on flashes
Touch and turn off the air conditioning system before turning it on once
more. There may be a problem in the air conditioning system if the indicator light
continues to flash. Turn the air conditioning system off and have it inspected by your
Lexus dealer.
CAUTION
■To prevent the windshield from fogging up
Do not use during cool air operation in extremely humid weather. The differ-
ence between the temperature of the outside air and that of the windshield can
cause the outer surface of the windshield to fog up, blocking your vision.
NOTICE
■To prevent 12 volt battery discharge
Do not leave the automatic air conditioning system on longer than necessary when
the engine is off.