engine Lexus GS350 2008 Specifications / LEXUS 2008 GS460/350 (OM30A87U) Owner's Guide

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2-1. Driving procedures
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CAUTION
■When taking a nap in the vehicle
Always turn the engine off. Otherwise, you may accidentally move the shift lever or
depress the accelerator pedal, which could cause an accident or fire due to engine
overheating. Additionally, if the vehicle is parked in a poorly ventilated area, exhaust
gases may collect and enter th e vehicle, leading to death or a serious health hazard.
■When braking the vehicle
●When the brakes are wet, drive more cautiously. 
Braking distance increases when the brakes are wet, and may cause one side of
the vehicle to brake differently than the other side. Also the parking brake may
not securely hold the vehicle.
●If the brake actuator (GS460) or brake booster (GS350) does not operate, do
not follow other vehicles closely and avoi d downhill or sharp turns that require
making. 
In this case, braking is still possible, but it will require more force on the pedal than
usual. Braking distance may also increase.
●Do not pump the brake pedal if turning the engine off. 
Each push on the brake pedal uses up the reserve for the power-assisted brakes.
●The brake system consists of 3 (GS460) or 2 (GS350) individual hydraulic sys-
tems: If one of the systems fails, the other will still operate. In this case, the brake
pedal should be depressed more firmly th an usual and braking distance becomes
longer. 
Do not drive your vehicle with only a single brake system. Have your brakes fixed
immediately.
■If the vehicle becomes stuc k or bogged (4WD models)
Do not spin the wheels recklessly when any of the tires is up in the air, or stuck in
sand or mud, etc. This may damage the drive system components or propel the
vehicle forward (or in another direction) and cause an accident.

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NOTICE
■If you get a flat tire while driving
A flat or damaged tire may cause the following situations. Hold the steering wheel
firmly and gradually press the brake pedal to slow down the vehicle.
●It may be difficult to control your vehicle.
●The vehicle will make abnormal sounds.
●The vehicle will behave abnormally.
Replace a flat tire with a new one. ( P. 515)
■When encountering flooded roads
Do not drive on a road that has flooded after heavy rain etc. Doing so may cause the
following serious damage to the vehicle.
●Engine stalling
●Short in electrical components
●Engine damage caused by water immersion
In the event that you drive on a flooded road and the vehicle is flooded, be sure to
have your Lexus dealer check the following.
●Brake function
●Changes in quantity and quality of oil and fluid used for the engine, automatic
transmission, transfer (4WD models), differentials, etc.
●Lubricant condition for the propeller shaf t (4WD models), bearings and suspen-
sion joints (where possible) and the function of all joints, bearings, etc.

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When driving
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Engine (ignition) switch
■Starting the engine
Check that the parking brake is set.
Check that the shift lever is set in “P”.
Sit in the driver’s seat and firmly depress the brake pedal.
The “ENGINE START STOP” switch indicator turns green.
Press the “ENGINE START
STOP” switch.
STEP1
STEP2
STEP3
STEP4

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■Changing “ENGINE START STOP” switch mode
Modes can be switched by pressing the “ENGINE START STOP” switch
when carrying the electronic key on your person. (The engine can be
started in any mode by operating the switch at the same time as depressing
the brake pedal.)
OFF*
Emergency flashers can be
used.
ACCESSORY mode
Some electrical components
such as the audio system can be
used.
The “ENGINE START STOP”
switch indicator turns amber.
IGNITION ON mode
All electrical components can
be used.
The “ENGINE START STOP”
switch indicator turns amber.
*: The power cannot be switched to
OFF unless the shift lever is in “P”.

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When driving
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■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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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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When driving
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Automatic transmission
Select a shift position appropriate for the driving conditions.
■Shifting the shift lever
While the “ENGINE START STOP ” switch is in IGNITION
ON mode, depress the brake pedal and move the shift lever.
■ Shift position uses
*1: To improve fuel consumption and reduce noises, set the shift lever in the
“D” position for normal driving.
*
2: By selecting shift ranges using “S” mode, you can control engine braking
forces.
Shift positionFunction
PParking the vehicle or starting the engine
RReversing
NNeutral
DNormal driving*1
S“S” mode driving*2 (  P. 1 2 7 )

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■Shift ranges and their functions
●You can choose from 8 levels (GS460) or 6 levels (GS350) of
engine braking force.
● A lower shift range will provide gr eater engine braking force than a
higher shift range, and the engine revolutions will also increase.
● If you accelerate while in ranges “1” to “7” (GS460) or “1” to “5”
(GS350), the shift range may auto matically range up in accordance
with the vehicle’s speed.
■“S” mode
When the shift range is “6” (GS460) or “4” (GS350) or lower, holding the shift
lever toward “+” sets the shift range to “8” (GS460) or “6” (GS350).
■Downshifting restrictions warning buzzer (in the “S” mode)
To help ensure safety and driving perfor mance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever is operated. (The warning buzzer will sound twice.)
■When driving with the cruise control syst em (or dynamic radar cruise control sys-
tem)
The engine brake will not operate in the “S” mode, even when downshifting to “7”,
“6”, “5” or “4” (GS460) or “5” or “4” (GS350). ( P. 150, 153)
■Snow mode automatic deactivation
Snow mode is automatically deactivated if the “ENGINE START STOP” switch is
turned to ACCESSORY or IGNITION ON mode after driving in snow mode.
■If the shift lever cannot be shifted from “P”
P. 5 2 4

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Turn signal lever
■Turn signals can be operated when
The “ENGINE START STOP” switch is in IGNITION ON mode.
■If the indicators flash faster than usual
Check that a light bulb in the front or rear turn signal lights has not burned out.
Left turn
Right turn
Move and hold the lever part-
way to signal a lane change
The left hand signal will flash
until you release the lever.
Move and hold the lever part-
way to signal a lane change
The right hand signal will flash
until you release the lever.

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2-2. Instrument cluster
Gauges and meters
The units used on the speedometer may differ depending on the target
region.

The following gauges, meters and display illuminate when the
“ENGINE START STOP” switch is in IGNITION ON mode.
Tachometer
Displays the engine speed in revolutions per minute.
Speedometer
Displays the vehicle speed.
Fuel gauge
Displays the quantity of fuel remaining in the tank.
Engine coolant temperature gauge
Displays the engine coolant temperature.
Multi-information display
 P. 1 3 9