2006 Lexus GS430 traction control

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xPage
1
Power window switches 37, 57
. . . . . . . . . . . . . . . . . . .
2 Driving position memory switches 198
. . . . . . . . . . .
3 Window lock switch 58
. . . . . . . . . . . . . . . . . . . . . . . . . .
4 Door lock switch 37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Side vents 268
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Engine switch 342
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Automatic air conditioning controls 254
. . . . . . . . . .
8 Audio system 274
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Clock 103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
.
10 Center vents 268
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 Outside temperature display 106
. . . . . . . . . . . . . . . . .
12 Touch screen 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Navigation system display (See the separate
“Navigation System Owner’s Manual”)
13 Security indicator light 40
. . . . . . . . . . . . . . . . . . . . . . .
14 Rear window and outside rear view
mirror defogger switch 56 . . . . . . . . . . . . . . . . . . . . . . .
15 Front passenger’s seat belt reminder light 76 . . . . .
16 Emergency flasher switch 60
. . . . . . . . . . . . . . . . . . . . Page
17 Glove box
110
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 Trunk lid opener main switch 126
. . . . . . . . . . . . . . . .
19 Tire selector switch 442
. . . . . . . . . . . . . . . . . . . . . . . . .
20 Cigarette lighter 107
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 Cupholders 115
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22 Seat heater switches or Seat ventilator/heater
switches 61, 63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23 Traction control system off switch
(Twowheel drive models only) 419 . . . . . . . . . . . . . .
24 Driving pattern selector switch 353
. . . . . . . . . . . . . . .
25 Damping mode select switch
(GS430 only) 417 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26 Coin box 116
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27 Ashtray 107
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
28 Automatic transmission selector lever 353 . . . . . . .
29 Tire pressure warning system reset switch 440 . . . .
30 Hood lock release lever 124
. . . . . . . . . . . . . . . . . . . . .
31 Parking brake pedal 352
. . . . . . . . . . . . . . . . . . . . . . . . .
32 Switch box xix
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xiiPage
1
Power window switches 37, 57
. . . . . . . . . . . . . . . . . . .
2 Driving position memory switches 198
. . . . . . . . . . .
3 Window lock switch 58
. . . . . . . . . . . . . . . . . . . . . . . . . .
4 Door lock switch 37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Side vents 268
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Engine switch 342
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Automatic air conditioning controls 254
. . . . . . . . . .
8 Audio system 274
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Clock 103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
.
10 Center vents 268
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 Outside temperature display 106
. . . . . . . . . . . . . . . . .
12 Touch screen 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 Security indicator light 40
. . . . . . . . . . . . . . . . . . . . . . .
14 Rear window and outside rear view
mirror defogger switch 56 . . . . . . . . . . . . . . . . . . . . . . .
15 Front passenger’s seat belt reminder light 76 . . . . .
16 Emergency flasher switch 60
. . . . . . . . . . . . . . . . . . . . Page
17 Glove box
110
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 Trunk lid opener main switch 126
. . . . . . . . . . . . . . . .
19 Tire selector switch 442
. . . . . . . . . . . . . . . . . . . . . . . . .
20 Cigarette lighter 107
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 Cupholders 115
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22 Seat heater switches or Seat ventilator/heater
switches 61, 63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23 Traction control system off switch
(Twowheel drive models only) 419 . . . . . . . . . . . . . .
24 Driving pattern selector switch 353
. . . . . . . . . . . . . . .
25 Damping mode select switch
(GS430 only) 417 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26 Coin box 116
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27 Ashtray 107
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
28 Automatic transmission selector lever 353 . . . . . . .
29 Tire pressure warning system reset switch 440 . . . .
30 Hood lock release lever 124
. . . . . . . . . . . . . . . . . . . . .
31 Parking brake pedal 352
. . . . . . . . . . . . . . . . . . . . . . . . .
32 Switch box xix
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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
89
Electronic Brake System Failure Warning
G13100

G13028
GS430 GS300
If the above message appears and the brake system
warning light (yellow) comes on, the following systems do
not operate. (GS430 only—In some cases, the
multiinformation display shows either “CHECK VSC” or
“CHECK ECB” only.)
 Traction control system
 Vehicle stability control system
 Hill− start assist control system
If the above message appears and the brake system
warning light (yellow) and “ABS” warning light come on,
the following systems do not operate. (GS430 only—In
some cases, the multiinformation display shows either
“CHECK VSC” or “CHECK ECB” only.)
 Anti− lock brake system
 Brake assist system
Although it is no problem to continue driving, have your vehicle
checked by your Lexus dealer as soon as possible.
 Variable Gear Ratio Steering System Warning
(GS430 only)
G13027
If there is a problem in the variable gear ratio steering
system, the master warning light comes on and the above
message appears.
If this message appears, the system does not work. Although
it is no problem to continue driving, have your vehicle checked
by your Lexus dealer as soon as possible.
 FourWheel Drive System Warning (Fourwheel
drive models only)
G13021
If there is a problem in the fourwheel drive 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.

SECTION 3 – 1
339
STARTING AND DRIVING
Starting and driving
Three−way catalytic converters340
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine exhaust caution 341
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating the engine switch 342
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking brake 352
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . .
Automatic transmission 353
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic throttle control system 364
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Intuitive parking assist 365
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear view monitor system 388
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise control 392
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . .
Dynamic radar cruise control 395
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adaptive variable suspension system 417
. . . . . . . . . . . . . . . . . . . . . . .
Traction control system 418
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle stability control system 420
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill −start assist control system 422
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Variable gear ratio steering system 424
. . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle dynamics integrated management 426
. . . . . . . . . . . . . . . . . . .
Brake system 427
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . .
Brake pad wear limit indicators 431
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric power steering system 432
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire pressure warning system 433
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pre−collision system 443
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\

STARTING AND DRIVING
418
TRACTION CONTROL SYSTEM
The traction control system automatically helps prevent
the spinning of rear wheels when the vehicle is started or
accelerated on slippery road surfaces.
When the engine switch is selected in “IG−ON” mode, the
system automatically turns on.
CAUTION
Under certain slippery road conditions, full traction of
the vehicle and power against rear wheels cannot be
maintained, even though the traction control system is
in operation. Do not drive the vehicle under any speed
or maneuvering conditions which may cause the
vehicle to lose traction control. In situations where the
road surface is covered with ice or snow, your vehicle
should be fitted with snow tires or tire chains. Always
drive at an appropriate and cautious speed for the
present road conditions.
G31038
 Slip indicator light
Leave the system on during the ordinary driving so that it
can operate when needed.
You may hear a sound in the engine compartment for a few
seconds just after the vehicle begins to move. This means that
the traction control system is in the self −check mode, but does
not indicate a malfunction.
When the traction control system is operating, the following
conditions occur:
 The system controls the spinning of the rear wheels. At this
time, the slip indicator light blinks.
 You may feel vibration or noise in your vehicle, caused by
operation of the brakes. This indicates the system is
functioning properly.
GS430—The slip indicator light comes on when the engine
switch is selected in “IG− ON” mode. The light goes off when
the engine is started.

STARTING AND DRIVING
419
GS300—The slip indicator light comes on for a few seconds
when the engine switch is selected in “IG
−ON” mode.
If the indicator light does not come on when the engine switch
is selected in “IG −ON” mode, contact your Lexus dealer.
Traction control off mode
(twowheel drive models only)
G31008
If your wheels get stuck in a ditch when you are driving on
a severe off road and sand, turn off the traction control
system. This system that controls engine performance
interferes with the process of freeing your wheels.
To turn off: Push “TRAC OFF” switch.
The slip indicator light will come on.
The vehicle stability control system is always activated even if
the traction control system is turned off. GS430
only—When the vehicle speed exceeds about 50 km/h
(30 mph) even if the traction control system is turned off, the
system turns on automatically.
To turn on: Push “TRAC OFF” switch once again.
The slip indicator light will go off.
In the following cases, contact your Lexus dealer:
 The slip indicator light does not come on when the engine
switch is selected in “IG −ON” mode.
 The slip indicator light remains on after the engine is started
(GS430), or remains on after the engine switch is selected
in “IG− ON” mode (GS300).
 The slip indicator light comes on in the normal driving mode
while driving.

STARTING AND DRIVING
420
Traction control system failure warning
G31039
 1GS430 2GS300
If the traction control system malfunctions, the slip
indicator light (twowheel drive models only) and brake
system warning light (yellow) come on. At this time, the
above message appears. (GS430 only—In some cases,
the multiinformation display shows either “CHECK VSC”
or “CHECK ECB” only.)
If the message appears, the traction control system, vehicle
stability control system and hill− start assist control system do
not work. Although it is no problem to continue driving, have
your vehicle checked by your Lexus dealer as soon as
possible.
VEHICLE STABILITY CONTROL SYSTEM
The vehicle stability control system helps provide
comprehensive control of the systems such as antilock
brake system, traction control, engine control, etc. This
system automatically controls the brakes and engine to
help prevent the vehicle from skidding when cornering on
a slippery road surface or operating steering wheel
abruptly.
This system activates when the vehicle speed is about more
than 15 km/h (9 mph).
You may hear a sound in the engine compartment for a few
seconds just after the vehicle begins to move. This means that
the system is in the self− check mode, but does not indicate a
malfunction.