2006 Lexus GS430 stop start

HOW TO USE THIS MANUAL
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HOW TO USE THIS MANUAL
The contents of this manual are explained briefly on this
page to help you make the best use of the manual. Please
read this page and the rest of the Owner’s Manual
carefully to make sure you fully understand the operation
of your vehicle.
This will help you enjoy safe and comfortable driving.
TABLE OF CONTENTS
The table of contents and the pictorial index provide easy
reference to the appropriate pages.
BASIC OPERATION QUICK REFERENCE
Operation of basic equipment is briefly explained in an easily
understandable way for quick reference.
SECTION 1 INSTRUMENTS AND CONTROLS
The vehicle’s equipment is divided into the 8 groups listed
below. Use of the equipment is explained, including any points
you should pay particular attention to.
1. Keys and doors
2. Switches
3. Gauges, meters and service reminder indicators
4. Interior equipment
5. Exterior equipment
6. Occupant restraint systems
7. Steering wheel and mirrors
8. Touch screen
SECTION 2 AIR CONDITIONING AND AUDIO
The features of the vehicle’s air conditioning and audio are
explained in detail. Be sure to read this section so that you can
make full use of them.
SECTION 3 STARTING AND DRIVING
Starting the engine, driving, stopping, operation of features
affecting vehicle handling, hints on vehicle safety and safe
driving techniques are all explained. Please read everything
in this section, and remember − drive safely!
SECTION 4 IN CASE OF AN EMERGENCY
This section explains what to do in the event of an urgent
situation such as the engine not starting or getting a flat tire,
etc. If such a problem occu rs, check the contents of this
Owner’s Manual and follow the instructions given.
SECTION 5 MAINTENANCE
This section explains the importance of regular maintenance.
Regular and periodic inspection and maintenance of your
Lexus will help to keep your vehicle in its best condition.
SECTION 6 SERVICE PROCEDURES AND
SPECIFICATIONS
Simple maintenance procedure and service data are provided
here for your reference should you wish to perform inspection
and maintenance yourself.

KEYS AND DOORS
32OPERATING THE WINDOWS AND MOON ROOF
The windows and moon roof can be operated using an
electronic key from outside the vehicle.*
NOTE:
*The windows can be deactivated. The moon roof can be
set to slide open, tilt up or deactivated.
Ask your Lexus dealer for details.
G11017
Push the “UNLOCK” button until the windows and moon roof
start to move. When you release the button, the windows and
moon roof stop operating.
This function will work even with the window lock switch
pressed in. For vehicles sold in U.S.A.
This device complies with
Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2)
this device must accept any interference received,
including interference that may cause undesired
operation.
NOTICE:
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference in a residential installation. This equipment
generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to
radio communications. However, there is no guarantee
that interference will not occur in a particular
installation. If this equipment does cause harmful
interference to radio or television reception, which can
be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by
one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and
receiver.
 Connect the equipment into an outlet on a circuit differ-
ent from that to which the receiver is connected.

SWITCHES
45
G12002
The automatic light control sensor is on top center of the
instrument panel.
Do not place anything on the instrument panel, and/or do not
affix anything on the windshield to block this sensor.
When the headlights come on, the lights automatically turn off
about 30 seconds after any of the doors is opened and closed
with the engine switch off.* To turn them on again, select the
engine switch in “IG− ON” mode, or turn the headlight switch off
and then twist the knob until the first or second clickstop.
If you are going to park for over one week, make sure the
headlight switch is off.
When the headlight switch is on with all the doors locked and
the trunk closed, pushing the ”LOCK” button on the electronic
key turns off the headlights.
NOTE:
*The time before turning off the lights can be changed.
Ask your Lexus dealer for details. Daytime Running Light System
The headlights turn on at reduced intensity when the parking
brake is released with the engine started, even with the light
switch in the ”OFF” position. They will not
go off until the engine
switch is turned off.
To turn on the other exterior lights and instrument panel lights,
twist the knob to the first clickstop.
Twist the knob to the second clickstop to turn on the headlights
to full intensity for driving at night.
When setting the knob to the third clickstop (”AUTO”), the
headlights will automatic ally adjust to full intensity and/or turn
on the other lights depending on the darkness of the
surroundings. Likewise, as the surroundings become brighter,
the headlights will turn to reduced intensity, ultimately turning
off the other lights.
NOTICE
To prevent the battery from being discharged, do not
leave the lights on longer than necessary when the
engine is not running.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
75
A warning light turning on briefly during operation does not
indicate a problem.
CAUTION
If either of the following conditions occurs, immediately
stop your
vehicle at a safe place and contact your Lexus
dealer.
 The light does not turn off even after the parking
brake is released while the engine is running.
In this case, the brakes may not work properly and
your stopping distance will become longer. Depress
the brake pedal firmly and bring the vehicle to an
immediate stop.
 The brake system warning light remains on together
with the “ABS” warning light.
In this case, not only the antilock brake system will
fail but also the vehicle will become extremely
unstable during braking.
GS430 only—Any of the following conditions may occur,
but do not indicate the malfunction:
The light may stay on for about 60 seconds after the engine
is started. It is normal if it turns off after a while.
 Depressing the brake pedal repeatedly may turn on the
warning light and buzzer. It is normal if the light turns off and
the buzzer stops sounding after a few seconds. 
You may hear a small sound in the engine compartment
after the engine is started or the brake pedal is depressed
repeatedly. This is a pump pulsating sound of the brake
system, and it is not a malfunction.
(b) Brake System Warning Light (yellow)
The light comes on when the engine switch is selected in
“IG−ON” mode.
GS430—If the engine is started, and the traction control
system, vehicle stability control system and hill −start assist
control system work properly, the light turns off after a few
seconds. Thereafter, if any part of the system malfunctions,
the light comes on again.
GS300—If the engine switch is selected in “IG −ON” mode, and
the traction control system, vehicle stability control system and
hill −start assist control system work properly, the light turns off
after a few seconds. Thereafter, if any part of the system
malfunctions, the light comes on again.
Although it is no problem to continue driving, have your vehicle
checked by your Lexus dealer as soon as possible.
(c) Driver’s Seat Belt Reminder Light and Buzzer
The light and buzzer act as a reminder to have the driver buckle
up the seat belt.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
77
(f) Discharge Warning Light
This light warns that the battery is being discharged.
If it comes on while you are driving, stop the vehicle, turn off the
engine, and check for the cause. Look first at the engine drive
belt.
 If it is loose or broken, the generator will not charge the
battery properly.
 If the belt is O.K., there is a problem somewhere in the
charging system.
The engine ignition will continue to operate, however, until the
battery is discharged. Turn off the air conditioning, blower,
radio, etc., and drive directly to the nearest Lexus dealer or
repair shop.
NOTICE
Do not continue driving if the engine drive belt is broken
or loose.
(g) Malfunction Indicator Lamp
This lamp comes on when the engine switch is selected in
“IGON” mode and goes off after the engine starts. This
means that the warning light system is operating properly.
If the lamp remains on, or the lamp comes on while
driving, first check the followings:
 Empty fuel tank
If the fuel tank is empty, refuel immediately.
 Loose fuel tank cap
If the fuel tank cap is loose, securely tighten it.
These cases are temporary malfunctions. The malfunction
indicator lamp will go off after taking several driving trips.
If the lamp does not go off even after several trips, contact your
Lexus dealer as soon as possible.
If the fuel tank is not empty or the fuel tank cap is not
loose...
 There is a problem somewhere in the engine, emission
control system, electronic throttle control system, automatic
transmission electrical system or warning light system itself.
Contact your Lexus dealer as soon as possible to service the
vehicle.
If this lamp comes on and engine speed does not increase
when the accelerator pedal is depressed, there may be a
problem somewhere in the electronic throttle control system.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
78At this time, vibration may occur. However, if you depress the
accelerator pedal more firmly and slowly, you can drive your
vehicle at low speeds. Have your vehicle checked by your
Lexus dealer as soon as possible.
Even if the abnormality of the electronic throttle control system
is corrected during low speed driving, the system may not be
recovered until the engine is stopped and the engine switch is
selected in “ACC” or “OFF” mode.
Emissions inspection and maintenance (I/M) programs
Your vehicle may not pass a state emission inspection if the
malfunction indicator lamp remains on. Contact your Lexus
dealer to check your vehicle’s emission control system and
OBD (On
−Board Diagnostics) system before taking your
vehicle for the inspection.
For details, see “Emissions inspection and maintenance (I/M)
programs” on page 497.
(h) Master Warning Light
If any system malfunctions, this warning light comes on or
flashes together with a warning tone, and a warning message
appears on the multi−information display. When the cause of
the problem is eliminated, the warning tone and message on
the display will turn off.
(i) ”ABS” Warning Light
The light comes on when the engine switch is selected in
“IG−ON” mode.
GS430—If the anti−lock brake system and the brake assist
system work properly, the light turns of f in a few seconds after
the engine is started. Thereafter, if either system malfunctions,
the light comes on again.
GS300—If the anti−lock brake system and the brake assist
system work properly, the light turns of f in a few seconds after
the engine switch is selected in “IG−ON” mode. Thereafter, if
either system malfunctions, the light comes on again.
When the “ABS” warning light is on, the anti− lock brake system
and the brake assist system do not operate, but the brake
system still operates conventionally.
If either of the following conditions occur, this indicates a
malfunction somewhere in the components monitored by
the warning light system. Contact your Lexus dealer as
soon as possible to service the vehicle.
 The light does not come on when the engine switch is
selected in “IG −ON” mode.
 The light remains on after the engine is started (GS430), or
remains on after the engine switch is selected in “IG −ON”
mode (GS300).
 The light comes on while you are driving.
A warning light turning on briefly during operation does not
indicate a problem.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
79
CAUTION
If the “ABS” warning light remains on together with the
brake system warning light (red), immediately stop your
vehicle at a safe place and contact your Lexus dealer.
In this case, not only the antilock brake system will fail
but also the vehicle will become extremely unstable
during braking.
GS430 only—Either of the following conditions may
occur, but does not indicate a malfunction:
 The light may stay on for about 60 seconds after the engine
is started. It is normal if it turns off after a while.
 Depressing the brake pedal repeatedly may turn on the
light. It is normal if it turns off after a few seconds.
(j) Open Door Warning Light
This light remains on until all the doors are completely closed.
(k) Adaptive Front Lighting System Off
Indicator Light
This light comes on when yo u turn off the Adaptive Front
Lighting System (AFS) by pushing the “AFS OFF” switch.
If there is a problem somewhere in the Adaptive Front Lighting
System (AFS) or automatic headlight leveling system, the light
flashes. At this time, both systems do not operate properly.
Although it is no problem to continue driving, have your vehicle
checked by your Lexus dealer as soon as possible.
(l) Low tire pressure warning light
This light comes on when the engine switch is selected in
“IG−ON” mode. If the tire pressure warning system works
properly and tire inflation pressure is appropriate, the light
goes off after a few seconds.
This light comes on or flashes in the following cases when the
engine switch is selected in “IG −ON” mode.
 When the low tire inflation pressure is detected while
driving...
If any tire has low inflation pressure, the light comes on.
The light goes off after the tire inflation pressure is adjusted
to a specified level.
 When initializing the system...
If initialization is completed, the light blinks three times.
 When the system malfunctions...
If the system malfunctions, the light blinks.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
85
Trunk Open Warning
G13007
When any door, hood or trunk is open with the engine
switch in “IGON” mode, a message appears to let you
know which door, the hood or trunk is open. If you
continue driving in this condition, the master warning
light flashes and a warning tone sounds when the vehicle
speed exceeds 5 km/h (3 mph).
If any of the above warning messages appears, stop your
vehicle and close the door, hood or trunk securely.
 Moon Roof Warning
G13013
If the driver’s door is opened with the engine switch
turned off and the moon roof opened, the master warning
light flashes, a warning tone sounds and the above
message appears.
When you leave your vehicle, be sure to close the moon roof.
Parking Brake Release Warning
G13009
If you start driving with the parking brake applied, the
master warning light flashes, a warning tone sounds and
the above message appears when the vehicle speed
exceeds 5 km/h (3 mph).
If the above warning message appears, stop your vehicle and
release the parking brake.
 Headlight Leveling System Failure Warning
G13010
If there is a problem in the automatic headlight leveling
system, the master warning light comes on, a warning
tone sounds and the above message appears.
If the above warning message appears, have your vehicle
checked by your Lexus dealer as soon as possible.