cruise control Lexus GS430 2006 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2005 PROD. OWNER'S MANUAL (OM30649U)

IMPORTANT INFORMATION ABOUT YOUR LEXUS
v
Accessories, spare parts and modification of
your Lexus
A wide variety of non−genuine spare parts and accessories for
Lexus vehicles are currently available in the market. You
should know that Toyota does not warrant these products and
is not responsible for their performance, repair, or
replacement, or for any damage they may cause to, or adverse
effect they may have on, your Lexus vehicle.
This vehicle should not be modified with non −genuine Lexus
products. Modification with non −genuine Lexus products
could af fect its performance, safety or durability, and may even
violate governmental regulations. In addition, damage or
performance problems resulting from the modification may not
be covered under warranty.
Spark ignition system of your Lexus
The spark ignition system in your Lexus meets all
requirements of the Canadian Interference− Causing
Equipment Standard.
Installation of a mobile twoway radio system
As the installation of a mobile two −way radio system in your
vehicle could affect electronic systems such as the multiport
fuel injection system/sequential multiport fuel injection system,
cruise control system, dynamic radar cruise control system,
anti− lock brake system, SRS airbag system and seat belt
pretensioner system, be sure to check with your Lexus dealer
for precautionary measures or special instructions regarding
installation.
Tires and loading on your Lexus
Underinflated or overinflated tire pressure and the
excess load may result in the deterioration of steering
ability and braking ability, leading to an accident. Check
the tire inflation pressure periodically and be sure to
keep the load limits given in this Owner’s Manual. For
details about tire inflation pressure and load limits, see
page 539 and 456.
Scrapping of your Lexus
The SRS airbag and seat belt pretensioner devices in your
Lexus contain explosive c hemicals. If the vehicle is scrapped
with the airbags and seat belt pretensioners left as they are,
this may cause an accident such as fire. Be sure to have the
systems of the SRS airbag and seat belt pretensioner removed
and disposed of by a qualified service shop or by your Lexus
dealer before you scrap your vehicle.
Leak detection pump
This pump performs fuel evaporation leakage check. This
check is done several hours after the engine is turned off. So
you may hear sound coming from underneath the luggage
compartment for several minutes. It does not indicate a
malfunction.

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xivPage
1
Tachometer 69
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Headlight high beam indicator light 47
. . . . . . . . . . .
3 Turn signal indicator light 47
. . . . . . . . . . . . . . . . . . . .
4 Headlight indicator light 44
. . . . . . . . . . . . . . . . . . . . . .
5 Slip indicator light 418, 420
. . . . . . . . . . . . . . . . . . . . . .
6 Fog light indicator light 48
. . . . . . . . . . . . . . . . . . . . . . .
7 Driver’s seat belt reminder light 75
. . . . . . . . . . . . . . .
8 SRS warning light 76
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Open door warning light 79
. . . . . . . . . . . . . . . . . . . . . .
10 Automatic transmission indicator lights 353 . . . . . .
11 Fuel gauge 68
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Fuel filler door indicator 128
. . . . . . . . . . . . . . . . . . . . .
13 Low fuel level warning light 80
. . . . . . . . . . . . . . . . . . .
14 Engine coolant temperature gauge 68
. . . . . . . . . . . .
15 Discharge warning light 77
. . . . . . . . . . . . . . . . . . . . . .
16 Brake system warning light (yellow) 75
. . . . . . . . . . . Page
17 Malfunction indicator lamp
77
. . . . . . . . . . . . . . . . . . .
18 Adaptive frontlighting system off
indicator light 46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 Antilock brake system warning light 78
. . . . . . . . . .
20 Precollision system warning light 80
. . . . . . . . . . . .
21 Brake system warning light (red) 74
. . . . . . . . . . . . . .
22 Master warning light 78
. . . . . . . . . . . . . . . . . . . . . . . . .
23 Electric power steering system warning light 80 . .
24 Multiinformation display 82
. . . . . . . . . . . . . . . . . . . . .
25 Odometer and trip meter 70
. . . . . . . . . . . . . . . . . . . . .
26 Low tire pressure warning light 79
. . . . . . . . . . . . . . .
27 Intuitive parking assist indicator light 366
. . . . . . . .
28 Snow mode indicator light 364
. . . . . . . . . . . . . . . . . . .
29 Cruise control indicator light 392
. . . . . . . . . . . . . . . .
30 Power mode indicator light 364
. . . . . . . . . . . . . . . . . .
31 Damping mode indicator light 417
. . . . . . . . . . . . . . . .

For detailed information, refer to the description given in each Section\
.
PICTORIAL INDEX
xviPage
1
Tachometer 69
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Headlight high beam indicator light 47
. . . . . . . . . . .
3 Turn signal indicator light 47
. . . . . . . . . . . . . . . . . . . .
4 Tail light indicator light 44
. . . . . . . . . . . . . . . . . . . . . . .
5 Slip indicator light 418, 420
. . . . . . . . . . . . . . . . . . . . . .
6 Fog light indicator light 48
. . . . . . . . . . . . . . . . . . . . . . .
7 Driver’s seat belt reminder light 75
. . . . . . . . . . . . . . .
8 SRS warning light 76
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Open door warning light 79
. . . . . . . . . . . . . . . . . . . . . .
10 Automatic transmission indicator lights 353 . . . . . .
11 Fuel gauge 68
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Fuel filler door indicator 128
. . . . . . . . . . . . . . . . . . . . .
13 Low fuel level warning light 80
. . . . . . . . . . . . . . . . . . .
14 Engine coolant temperature gauge 68
. . . . . . . . . . . .
15 Discharge warning light 77
. . . . . . . . . . . . . . . . . . . . . .
16 Brake system warning light (yellow) 75
. . . . . . . . . . . Page
17 Malfunction indicator lamp
77
. . . . . . . . . . . . . . . . . . .
18 Adaptive frontlighting system off
indicator light 46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 Antilock brake system warning light 78
. . . . . . . . . .
20 Precollision system warning light 80
. . . . . . . . . . . .
21 Brake system warning light (red) 74
. . . . . . . . . . . . . .
22 Master warning light 78
. . . . . . . . . . . . . . . . . . . . . . . . .
23 Electric power steering system warning light 80 . .
24 Multiinformation display 82
. . . . . . . . . . . . . . . . . . . . .
25 Odometer and trip meter 70
. . . . . . . . . . . . . . . . . . . . .
26 Low tire pressure warning light 79
. . . . . . . . . . . . . . .
27 Intuitive parking assist indicator light 366
. . . . . . . .
28 Snow mode indicator light 364
. . . . . . . . . . . . . . . . . . .
29 Cruise control indicator light 392
. . . . . . . . . . . . . . . .
30 Power mode indicator light 364
. . . . . . . . . . . . . . . . . .
31 Damping mode indicator light 417
. . . . . . . . . . . . . . . .

G00095
PICTORIAL INDEX
xviii
STEERING WHEEL AND COLUMN
Page
1 Headlight, turn signal and
fog light switches 44, 47, 48 . . . . . . . .
2 Audio remote control
switches 331
. . . . . . . . . . . . . . . . . . . . . .
3 Distance switch 406
. . . . . . . . . . . . . . .
4 Speech command button (See the
separate “Navigation System
Owner’s Manual”.)
5 Telephone button 220
. . . . . . . . . . . . . .
6 Windshield wiper and washer
switches 49
. . . . . . . . . . . . . . . . . . . . . . .
7 Multiinformation
change switch 82
. . . . . . . . . . . . . . . . .
8 Cruise control switch 392, 395 . . . . . .
9 Tilt and telescopic steering
adjustment switch 204
. . . . . . . . . . . . .
For detailed information, refer to the
description given in each Section.

QUICK REFERENCE
4NOTE:
Vehicles
with the cruise control: When the cruise control is being used, even if \
you downshift from “D” or “6” (sixth range) to “5” (\
fifth
range), or “D” or “5” (fifth range) to “4” (fourth\
range), engine braking will not be enabled because the cruise control \
is not cancelled.
For vehicle speed reduction, see page 394. Vehicles with the dynamic radar cruise control: When the cruise control i\
s being us ed
in the conventional (fixed speed) cruise control mode or in the vehicle −to− vehicle distance control mode, even if you downshift from
“D” or “6” (sixth range) to “5” (fifth range) or “D”,\
or “5” (fifth range) to “4” (fourth range), engine brak\
ing will not be enabled because
the cruise control is not cancelled. For vehicle speed reduction, see p\
ages 416.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
84
(b) Graphic information
The following graphic information is shown on the
display.
Lexus park assist system display (if equipped)
 Dynamic radar cruise control display (if equipped)
See page 365 for Lexus park assist system and page 395 for
dynamic radar cruise control.
If you push the Lexus park assist system switch or turn the
engine switch on with the main switch of the Lexus park assist
system on, the Lexus park assist system screen appears for
2 seconds and then the multi −information display returns to the
previous screen.
When you push the main switch of the dynamic radar cruise
control, the dynamic radar cruise control screen appears.
When you push the “DISP” switch with the radar cruise control
screen on the display, the screen changes to cruise
information display.
(c) Warning messages
The following warning messages are shown on the
multiinformation display.
 Open Door Warning
G13041

G13006
G13042

G13043
Hood Open Warning
G13008

GAUGES, METERS AND SERVICE REMINDER INDICATORS
93
Radar Cruise Control Warning
G13073
If the system cannot easily measure the
vehicletovehicle distance because of a dirty millimeter
wave radar sensor or grille cover while the dynamic radar
cruise control is on, the master warning light comes on
and the “CRUISE” indicator light flashes. At this time a
warning tone sounds and the above message appears.
If this message appears, clean the sensor and grille cover with
a soft cloth and try setting the preset speed again. If the dirt
is removed without cleaning, the system will automatically
enter the “RADAR READY” mode. If the system does not enter
the “RADAR READY” mode even after cleaning or the
message remains on the display, the system might be
malfunctioning. Although it is no problem to continue driving,
contact your Lexus dealer.
G13074
If the system cannot easily measure the
vehicletovehicle distance because of the following
conditions while the dynamic radar cruise control is on,
the master warning light comes on, the “CRUISE”
indicator light flashes. At this time a warning tone sounds
and the above message appears.
 The driving pattern selector switch is set to the snow
position mode.
 It is determined that it is difficult to make a measurement
because of bad weather (such as extremely hot weather)
 The wipers are operated at high speed with the wiper lever
in the “AUTO” position
In the following cases, the dynamic radar cruise control
switches to the “RADAR READY” mode:
 The driving pattern selector switch is changed to the normal
or power position.
 The wipers are stopped or are switched to low speed or
intermittent operation. (Including intermittent and stopped
wipers in the “AUTO” position)

GAUGES, METERS AND SERVICE REMINDER INDICATORS
94In the above conditions, press the control lever upward in the
“+ RES” direction and release it. The dynamic radar cruise
control will be restored, however, even after the weather
clears, if the setting operation cannot be performed or if the
warning message still appears, the system might have
malfunctioned. Although it is no problem to continue driving,
contact your Lexus dealer.
G13075
If the system malfunction is detected when dynamic radar
cruise control is in the “RADAR READY” mode or
operating, the master warning light comes on and the
“CRUISE” indicator light flashes. At this time a warning
tone sounds and the above message appears.
If this message appears, stop your vehicle in
a safe place, turn
the engine switch off, and then restart it to reset the system.
If the setting still cannot be made or the same message
appears again, the system might have malfunctioned.
Although it is no problem to continue driving, contact your
Lexus dealer.
NOTICE
While you are cruising with the dynamic radar cruise
control on, if the master warning light comes on, the
“CRUISE” indicator light flashes, “CHECK CRUISE
SYSTEM” appears on the multiinformation display and
the warning tone sounds, turn the engine switch off and
then on again. If the function is cancelled again after
setting or if settings cannot be made, the dynamic radar
cruise control system may be malfunctioning.
Although it is no problem to continue driving, have your
vehicle checked by your Lexus dealer.

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
360When
the cruise control is being used, even if you downshift
from “D” or “6” (sixth range) to “5” (fifth range)\
, engine
braking will not be enabled because the cruise control is not
cancelled. For vehicle speed reduction, see page 394.
Vehicles with the dynamic radar cruise control —
When the cruise control is being used in the conventional
(fixed speed) cruise control mode or in the
vehicle −to−vehicle distance control mode, even if you
downshift from “D” or “6” (sixth range) to “5” (fif\
th range),
engine braking will not be enabled because the cruise
control is not cancelled. For vehicle speed reduction, see
pages 416 and 404.
 Shift into the “4” (fourth range) position. The transmission
will downshift to fourth gear when the vehicle speed is or
becomes lower than the speed listed below and more
powerful engine braking will be enabled.
GS430 193 km/h (120 mph)
GS300 (2WD) 187 km/h (116 mph)
GS300 (4WD) 178 km/h (111 mph)
If you drive in the “D” position: Shift the selector lever to
the “S” position and shift the lever down to the “–” posi\
tion
once to select “4” (fourth range). However, when you move
the lever to the “S” position while the AI shifting control is
operating, the first shift range will be “5” (fifth range), “4”
(fourth range) or “3” (third range) because the suitable shift
range is selected depending on the driving condition.
If you drive in the “S” position: Shift the selector lever
down to the “–” position to select the “4” (fourth range\
). When
the cruise control is being used, even if you downshift
from “D” or “5” (fifth range) to “4” (fourth range)\
, engine
braking will not be enabled because the cruise control is not
cancelled. For vehicle speed reduction, see page 394.
Vehicles with the dynamic radar cruise control —
When the cruise control is being used in the conventional
(fixed speed) cruise control mode or in the
vehicle −to−vehicle distance control mode, even if you
downshift from “D” or “5” (fifth range) to “4” (fourth range),
engine braking will not be enabled because the cruise
control is not cancelled. For vehicle speed reduction, see
pages 416 and 404.
 Shift into the “3” (third range) position. The transmission will
downshift to third gear when the vehicle speed is or
becomes lower than the speed listed below and more
powerful engine braking will be enabled.
GS430 144 km/h (90 mph)
GS300 (2WD) 135 km/h (84 mph)
GS300 (4WD) 129 km/h (80 mph)
If you drive in the “D” position: Shift the selector lever to
the “S” position and shift the lever down to the “–” posi\
tion
twice to select the “3” (third range). However, when you
move the lever to the “S” position while the AI shifting control
is operating, the first shift range will be “5” (fifth range), “\
4”
(fourth range) or “3” (third range) because the suitable shift
range is selected depending on the driving condition.
If you drive in the “S” position: Shift the selector lever
down to the “–” position to select “3” (third range).