2005 LEXUS LS430 Owners Manual

STARTING AND DRIVING
342In the following case, the preset speed automatically
cancels out. At this time, the multiinformation display
shows “RADAR READY” and the dynamic radar/laser
cruise control enters the ready mode.
The vehicle speed falls below about 40 km/h (25 mph). (40
km/h (25 mph) is designated as a cancel speed.)
CAUTION
In this case, the warning tone reminds you that the
dynamic
radar/laser cruise control is cancelled and you
must apply the brakes to slow the vehicle.
In the following cases, the warning messages appear and
the preset speed automatically cancels out. When
dynamic radar/laser cruise control is restored, the
warning messages turn off and dynamic radar/laser
cruise control enters “RADAR READY” mode.
a. The slip indicator light blinks and a warning tone sounds.
(This occurs when the vehicle is about to skid.)
b. The driving pattern selector switch is set to “SNOW” mode.
c. The anti −lock brake system is activated by automatic
braking. (The warning tone sounds.)
d. The sensor does not operate properly because a foreign
matter sticks to the sensor.
Dynamic radar cruise control—
e. The wipers are operated at high speed (including high
speed operation with the wiper lever in the “AUTO” position.)
Dynamic laser cruise control—
f. The wipers are operated at high or low speeds (including
high and low speed operations with the wiper lever in the
“AUTO” position.)

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343
NOTICE
If the preset speed automatically cancels out for other
than the above reasons, do not operate the dynamic
radar/laser cruise control. Although it is no problem to
continue driving, have your vehicle checked by your
Lexus dealer at the earliest opportunity.
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 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 U.S.A.) or
5 km/h (for Canada).

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344
4Resetting to a slower speed
Press the control lever downward in the “– SET” direction and
hold it. The displayed speed will decrease in increments of 5
mph (for 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 leve r 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. 5 Resuming 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.

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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 (followup
cruising) is on, 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.
31L588
CAUTION
If other vehicles are driving outside of the millimeter
wave radar or laser radar detection range, a delay in the
detection of the vehicle cutting in at short range or
detection failure of the motorcycle running on the side
of the same lane will occur. In this case, the dynamic
radar/laser cruise control system will not function
properly.

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346
CAUTION
When a slower vehicle in front of you leaves the lane,
the dynamic radar/laser cruise control will no longer
detect a vehicle ahead and will attempt to accelerate
the vehicle to the faster preset speed.
 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.
(d) Changing vehicletovehicle distance
31L635
 1 Long 2Middle 3Short
You can select one of the following vehicletovehicle
distances: “Long”, “Middle” or “Short”. Each time you
push the “DISP2” switch briefly, 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 pushing the “DISP2” switch longer 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.

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347
The vehicle
−to− vehicle distance is always set to “Long” when
the ignition switch is turned on.
CAUTION
 Select the vehicletovehicle distance
considering traffic conditions. The approximate
vehicletovehicle distance based on time
interval when driving at 88 km/h (55 mph) is
shown below :
“Long” about 75 m (about 245 ft.) . . . . . . . .
“Middle” about 50 m (about 165 ft.) . . . . . .
“Short” about 30 m (about 100 ft.) . . . . . . .
If the vehicle speed is slower than 88 km/h (55 mph),
the distance will be shorter than the above.
 During long downhill driving, the vehicletovehicle
distance will be shorter than the selected distance.
(e) Braking control
Dynamic radar/laser 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.
31L177
 1
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. The multi− information display changes as shown in
the illustration and the stop/tail lights on your vehicle and on the
vehicle on the display come on.

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CAUTION
Braking control will not ensure that your vehicle will
reduce speed appropriately. Do not rely on dynamic
radar/laser cruise control to prevent collision.
(f) Approach warning
31L332
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.

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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(g) Millimeter wave radar sensor (Vehicles with dynamic radar cruise
control)
31L359a
 1Millimeter 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 352.