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

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3Resetting to a faster speed
Press the control lever upward in the ”+ RES” direction and
hold it. The displayed speed will increase in increments of 5
mph (for the U.S.A.) or 5 km/h (for Canada). Release the lever
when the desired speed is attained. The vehicle will gradually
increase to the displayed speed.
Depressing the accelerator pedal and pressing the control
lever downward in the “– SET” direction will not reset to a faster
speed. At this time the set speed falls by 5 mph (for the U.S.A.)
or 5 km/h (for Canada).
CAUTION
When the vehicletovehicle distance control is on (on
followup cruising), your cruising speed is regulated in
proportion to the speed of the vehicle ahead, so
increasing the preset vehicle speed using the control
lever does not accelerate the vehicle. However, if the
vehicle ahead leaves the lane, your cruising speed will
increase up to the preset speed because the preset
speed has been set higher using the control lever.
Confirm the setting on the multiinformation display.
4 Resetting to a slower speed
Press the co ntrol lever downward in the “– SET” direction and
hold it. The displayed speed will decrease in increments of 5
mph (for the U.S.A.) or 5 km/h (for Canada). Release the lever
when the desired speed is attained. The vehicle will gradually
decrease to the displayed speed.
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.
If the control lever is released when the vehicle speed exceeds
the upper limit of the preset speed traveling downhill while you
are pressing the control lever downward, the system will
memorize the upper limit of the preset speed as a preset
speed.
Even if you downshift the transmission from “D” or “6” (six\
th
range) to “5” (fifth range), or from “D” or “5” (f\
ifth range) to “4”
(fourth range) in the vehicle −to− vehicle distance control mode,
engine braking will not be enabled because this mode is not
cancelled. To decrease the vehicle speed, reset to a slower
speed with the cruise control lever or depress the brake pedal.
If you use the brake pedal, cruise control is cancelled.

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405
5Resuming the preset speed
If the preset speed has been cancelled, when you push the
lever up in the “+ RES” direction while “RADAR READY”
shows up on the multi −information display and at a vehicle
speed of about more than 40 km/h (25 mph), the speed set
prior to cancellation will be restored.
During follow −up cruising, if there are no vehicles running
ahead because they have changed lanes, your vehicle will
accelerate gradually up to the preset speed.CAUTION
 Deceleration cruising function and approach
warning do not operate when the vehicle ahead is at
a stop or driving very slowly.
 While vehicletovehicle distance control is on (on
followup cruising), acceleration and deceleration
are automatically performed in proportion to the
speed of the vehicle ahead detected. However, if the
vehicle ahead of you decelerates abruptly or if
another vehicle cuts in ahead of you, your vehicle
may collide with the vehicle ahead unless you
manually depress the brake pedal to slow down your
vehicle. If you need to accelerate because the vehicle
ahead or you changes lanes, then depress the
acceleration pedal.
 Depending on the road configuration (curved roads,
left and right continuous curved roads, driving at the
start or end of the curve, narrow driving lanes due to
road construction) or your vehicle condition
(steering wheel maneuvering, position in the lane or
unstable driving because of an accident or
breakdown), vehicles in other lanes or surrounding
objects will be detected, resulting in a control failure
or the activated approach warning. This may also
result in a very close distance between vehicles due
to a failure to detect the vehicle ahead. Maneuvering
the steering wheel in response to a violent lateral
wind will cause similar conditions.

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406(d) Changing vehicletovehicle distance
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 1
Long 2Middle 3Short
You can select one of the following vehicletovehicle
distances: “Long”, “Middle” or “Short”. Each time you
pull the distance switch briefly toward you, the setting
changes from “Long” to “Middle” to “Short” and then
back to “Long”. You can confirm the setting on the
multiinformation display.
It should be noted that pulling the “DISP” switch will change to
another screen.
Your vehicle speed changes in proportion to the speed of
the vehicle ahead, maintaining the selected distance.
However, if the vehicle speed is slower, the selected
distance will be shorter than the designated distance.
When the vehicle− to−vehicle distance control mode is
activated or the multi−information display indicates “RADAR
READY”, the vehicle −to −vehicle distance setting can be
changed. The vehicle−
to−vehicle distance is always set to “Long” when
the engine switch is turned on.
CAUTION
 Select the vehicletovehicle distance
considering traffic conditions. The approximate
vehicletovehicle distance based on time
interval when driving at 80 km/h (50 mph) is
shown below :
“Long” about 50 m (about 164 ft.) . . . . . . . .
“Middle” about 40 m (about 132 ft.) . . . . . .
“Short” about 30 m (about 100 ft.) . . . . . . .
If the vehicle speed is slower than 80 km/h (50 mph),
the distance will be shorter than the above.
 During long downhill driving, the vehicletovehicle
distance will be shorter than the selected distance.

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407
(e) Braking control
Dynamic radar cruise control is not a collision avoidance
system. If an approach warning is activated, depress the brake
pedal to decelerate to ensure an appropriate
vehicle
−to−vehicle distance.
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Under the vehicletovehicle distance control
2Braking activated
Braking control is operating only when the vehicle −to− vehicle
distance control mode is selected and your vehicle speed
exceeds about 40 km/h (25 mph).
If you are getting closer to the vehicle ahead at relatively higher
speed than those of the vehicle ahead or if engine braking
cannot be applied properly, braking control is automatically
activated. At this time, “BRAKE” flashes on the
multi−information display, indicating that the brakes are being
used.
CAUTION
Braking control will not ensure that your vehicle will
reduce speed appropriately. Do not rely on dynamic
radar cruise control to prevent collision.

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408(f) Approach warning
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CAUTION
While you are cruising in the vehicletovehicle
distance control mode, if the vehicle ahead decelerates
abruptly or if another vehicle cuts in ahead of you,
inadequate braking will make your vehicle closer to the
vehicle ahead of you and the multiinformation display
flashes and beeps. The driver must depress the brake
pedal to slow down, ensuring collision avoidance or
that sufficient vehicletovehicle distance is
maintained.

The approach warning may not turn on even if the
vehicle drives closer to the vehicle ahead in the
following conditions:
♦ Your vehicle and the vehicle ahead are cruising at
almost the same speed.
♦ The vehicle ahead is cruising at a faster speed than
yours. (The distance between the vehicles will
become longer.)
♦ Pay special attention to the very slow vehicle at the
end of the line in heavy traffic or at the tollgate.
♦ Immediately after the speed setting.
♦ The accelerator pedal is depressed or immediately
after the release of the accelerator pedal.

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409
(g) Millimeter wave radar sensor
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Millimeter wave grille cover
2Millimeter wave radar sensor
The millimeter wave radar sensor is used for
vehicletovehicle distance control cruising. When the
millimeter wave radar sensor is disabled for some reason,
the warning message appears on the multiinformation
display. For details, see “Vehicletovehicle distance
control mode failure warning” on page 410.
CAUTION
To ensure that the dynamic radar cruise control system
will function properly while driving, observe the
following:
 Always keep the millimeter wave radar sensor and
grille cover clean. When cleaning, use a soft cloth
and be careful not to damage the sensor and grille
cover.
 Avoid strong impacts around the millimeter wave
radar sensor. An incorrect millimeter wave radar
sensor alignment will result in system malfunction.
A special device is required to adjust the millimeter
wave radar sensor alignment. Be sure to have the
sensor adjusted by your Lexus dealer.
 Do not disassemble the millimeter wave radar
sensor.
 Do not affix a sticker (including a transparent sticker)
or attach an accessory around the millimeter radar
sensor or the grille cover.
 Do not modify or paint the grille cover. When
replacing the grille cover, be sure to use a genuine
grille cover.

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410For vehicles sold in U.S.A.
FCC WARNING
Changes or modifications not expressly approved by the
party responsible for compliance could void the user’s
authority to operate the equipment.
FCC RF exposure information
This device complies with the FCC RF exposure
requirements.
For vehicles sold in Canada
Operation is subject to the following two conditions;
(1) this device may not cause interference, and
(2) this device must accept any interference received, including interference that may cause undesired
operation of the device.
(h) Vehicletovehicle distance control mode failure
warning
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If there is trouble somewhere in the dynamic radar cruise
control while the vehicle −to−vehicle distance control mode is
on, the ”CRUISE” indicator light in the instrument cluster
flashes, the master warning light comes on and the warning
tone sounds, and one or more of the following warning
messages will appear on the multi −information display.
 “CLEAN RADAR SENSOR”
 “CRUISE NOT AVAILABLE”
 “CHECK CRUISE SYSTEM”
If any warning message shown above appears, the preset
speed automatically cancels out.

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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 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 above message appears.
 The driving pattern selector switch is set to the snow
position.
 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.)
In 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.