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

STARTING AND DRIVING
415
You cannot set a desired speed if the master warning light
comes
on, the warning tone sounds and the multi− information
display indicates a warnin g message such as “CHECK
CRUISE SYSTEM”. If this messages appears on the display,
see “Conventional cruise control mode failure warning” on
page 417.
If you turn off the “ON−OFF” button while the warning message
is displayed, the warning message turns off and the
multi−information display switches to another screen. When
you turn the “ON− OFF” button on again, the warning message
comes back on the display. If no warning message appears on
the display, the setting can be made.
You can change the dynamic radar cruise control screen to
another screen even while the warning message is displayed.
2 Cancelling the preset speed
You can cancel the preset speed by doing any of the following:
a. Pulling the control lever in the ”CANCEL” direction.
b. Depressing the brake pedal.
c. Pushing the “ON− OFF” button.
If cancelled by a. or b., the multi−information displays shows
nothing and the conventional cruise control enters the ready
mode.
If cancelled by c., the “CRUISE” indicator light goes off in the
instrument cluster and the multi −information display shows
“CRUISE OFF”. In this case, the preset speed data is cleared,
and you must set the speed from the beginning. In the following cases, the preset speed automatically
cancels out:
a. The vehicle speed falls below about 40km/h (25 mph).
b. If the vehicle speed drops 16 km/h (10 mph) below the
preset speed, the preset speed will also automatically be
cancelled.
c. The control lever is presse
d downward in the “– SET”
direction and held at less than about 45 km/h (28 mph). (45
km/h (28 mph) is designated as a lower preset speed limit .)
If the vehicle speed falls below about 40 km/h (25 mph), the
preset speed data is cleared and you must set the speed from
the beginning.
If cancelled by the above cases, the multi −information display
shows nothing and the conventional cruise control enters the
ready mode.
If the preset speed automatically cancels out for other than the
above reasons, do not operate the cruise control. Although it
is no problem to continue driving, have your vehicle checked
by your Lexus dealer at the earliest opportunity.

STARTING AND DRIVING
416
3Resetting to a faster speed
Press the control lever upward in the “+ RES” direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held upward, the vehicle will gradually gain
speed.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
increased 1. 6 km/h (1 mph) each time by pressing the control
lever upward in the “+ RES” direction quickly within 0.6
seconds.
A quicker way to reset the speed is to accelerate and then
press the control lever downward in the “– SET” direction. 4 Resetting to a slower speed
Press the co ntrol lever downward in the “– SET” direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held downward, the vehicle speed will
gradually decrease.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
lowered 1.6 km/h (1 mph) each time by pressing the control
lever downward in the “– SET” direction quickly within 0.6
seconds.
A quicker way to reset the preset speed is to depress the brake
pedal and then press the control lever downward in the “– SET”
direction.
Even if you downshift the transmission from the “D” or “6” (\
sixth
range) to “5” (fifth range), or from “D” or “5” (f\
ifth range) to “4”
(fourth range) in the conventional cruise control mode, engine
braking will not be applied because this mode is not cancelled.
To slow down, reset the cruise control to a slower speed with
the cruise control lever or depress the brake pedal. If you use
the brake pedal, cruise control is cancelled.

STARTING AND DRIVING
417
5Resuming the preset speed
If the preset speed is cancelled by pulling the control lever, by
depressing the brake pedal or vehicle stability control
activation, pushing the lever up in the “+ RES” direction will
restore the speed set prior to cancellation. However, once the
vehicle speed falls below about 40 km/h (25 mph), the preset
speed will not be resumed.
(c) Conventional cruise control mode failure warning
G13075
If the system malfunction is detected when the
conventional cruise control mode is in the ready mode or
operating, the master warning light comes on, a warning
tone sounds and the above message appears.
If this message appears, push the “ON− OFF” button to turn the
system off and then push it again to turn it on. 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.
ADAPTIVE VARIABLE SUSPENSION SYSTEM (GS430 only)
G31041
 1Sport position 2Normal position
The adaptive variable suspension system controls
suspension and steering, and ensures optimum vehicle
posture and steering capabilities depending on the
driving condition.
Sport mode: Suitable for sporty type driving, such as on
winding mountain roads and high speed driving.
Normal mode: Suitable for ordinary driving.
To turn on the sport mode, push the selector switch on the
“SPORT” side. The indicator comes on in the instrument
cluster.
To change to the normal mode, push the switch to the “NORM”
side.

STARTING AND DRIVING
443
CAUTION
When the tires whose ID code is registered at “MAIN”
are used, the system does not work properly with the
selector switch set at “2nd”. If the tires whose ID code
is registered at “2nd” are stored nearby, the system will
detect their tire inflation pressure (and vice versa).
Liquid sealants for flat tires
NOTICE
Do not use liquid sealants for flat tires as the tire
pressure sensors will be damaged.
PRECOLLISION SYSTEM
(Vehicles with dynamic radar cruise control)
When the precollision system detects what it perceives
to be an unavoidable collision, the front seat belts are
quickly drawn back by the retractors (precollision seat
belts) and more powerful braking is applied according to
the amount of pedal depression to help reduce injury to
the occupants and damage to the vehicle body. In
addition, the adaptive variable suspension works to help
regulate the vehicle not to pitch forward so much.
The pre−collision system will operate when the engine switch
is selected in “IG −ON” mode.

ELECTRICAL COMPONENTS
568
No.FUSEAMPERECIRCUIT
28 ECUIG LH10
Vehicle stability control system,
Electronic control brake system,
Yaw rate and G sensor,
Steering sensor, Cruise control
system, Dynamic radar cruise
control system, Electronic
power steering system, Variable
gear ratio steering system,
Rear view monitor system,
Four−wheel drive system, Front
controller, Moon roof, Rain
sensor
29 FR S/HTR
LH15Seat heater, Heated and
ventilated seats
30 FR P/SEAT LH30Power seat system
31 A/C7.5Air conditioning system
32 TV7.5Audio system, Air conditioning
system, Rear view monitor
system
33 TRK OPN10Trunk lid opener
34 LHB10Theft deterrent system
35 S/ROOF25Moon roof
36 ECUB10
Variable gear ratio steering
system, Electronic power
steering system, Driver’s seat
switch module
37 ABS
MAIN310Electronic control brake system
No.FUSEAMPERECIRCUIT
38 TURNHAZ15Turn signal lights, Emergency
flashers
39 IG2 MAIN20“IG2”, “GAUGE” and “IGN”
40 RAD NO.230Audio system
41 D/C CUT20“DOME “ and “MPX− B”
42 RAD NO.130Audio system
43 MPXB10
Multiplex communication
system, Front controller, Door
control system (Power door
lock system, Door courtesy
lights, Power windows, Power
rear view mirror control system,
Outside rear view mirror
heaters), Power seat system,
Steering sensors, Electronic
control brake system, Power tilt
and telescopic steering system,
Gauges and meters,
Combination switch
44 DOME10
Foot lights, Vanity lights,
Gauges and meters, Steering
spot light, Steering switch
illumination, Rear personal
lights, Automatic transmission
selector lever spot light, Front
personal lights
45 ABS
MAIN210Electronic control brake system
46 ABS
MOTOR30Anti− lock brake system