2005 LEXUS LS430 stop start

STARTING AND DRIVING
314
(e) Parking
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 1Parking brake pedal 2Brake pedal
3“P” (Park) position
1. Bring the vehicle to a complete stop.
2. Depress the parking brake pedal fully to securely apply the
parking brake.
3. With the brake pedal held down with your foot, shift the
selector lever to the “P” position.
CAUTION
Never attempt to move the selector lever into “P” under
any circumstances while the vehicle is moving. Serious
mechanical damage and loss of vehicle control may
result.
(f) Good driving practice
 If the transmission repeatedly shifts up and down between
fourth and overdrive gears when climbing a gentle slope,
shift the selector lever to the “4” position. Be sure to shift the
selector lever to the “D” position after climbing the slope.
 When towing a trailer, in order to maintain efficient engine
braking and electrical charging performance, do not use
overdrive. The selector lever must be in the “4” position.
CAUTION
Always keep your foot on the brake pedal while stopped
with the engine running. This prevents the vehicle from
creeping.
NOTICE
Always use the brake pedal or the parking brake to hold
the vehicle on an upgrade. Do not attempt to hold the
vehicle using the accelerator pedal, as this can cause
the transmission to overheat.

STARTING AND DRIVING
321
CAUTION
Do not install an accessory or the like within the sensor
detection range. Doing so may cause the Lexus park
assist system to malfunction, resulting in an accident.
NOTICE
The sensors do not detect an obstacle just under the
bumper. A short object, thin stake or the like will be
detected once but might not be detected as your
vehicle gets very close to such an object.
 If an obstacle is very close to your vehicle, it might
not be detected.
 If a sensor is subjected to a strong impact, it will not
operate properly.
The Lexus park assist system may not work properly in
the following cases:
When icicles, snowflakes or mud gets on the sensors.
If removed, the system will work properly.
 When the sensor is frozen.
If deiced, the system will work properly.
 When the sensor is covered with something.
If removed, the system will work properly. Especially in cold weather, a malfunction warning screen may
appear on
the display due to frozen sensors. If the “Clean Park
Sonar” appears on the display, be sure to clean the sensor. If
the “Clean Park Sonar” appears despite no mud, ice or
snowflakes on the sensor, the sensor might have
malfunctioned. Have your vehicle checked by your Lexus
dealer.
In the following conditions, the detection range may be
affected:
 When you stop your vehicle in extreme hot or cold weather.
 Foreign matter such as snowflakes or mud gets on the
sensor.

STARTING AND DRIVING
334If no vehicle is running ahead of you:
1
Cruising at a fixed speed: If there is no vehicle detected
ahead, your cruising speed is maintained at the preset
speed from about 45 km/h (28 mph) to about 135 km/h (85
mph). The preset speed is displayed in the
multi−information display. For the vehicle speed setting,
see “Setting operation ” on page 340.
If a vehicle is detected ahead of you:
2 Deceleration cruising function: If a slower moving
vehicle is detected ahead of you, your vehicle cruising
speed decreases within the range of about 40 km/h (25
mph) to about 135 km/h (85 mph). The multi− information
display shows the preset speed, the detected vehicle
ahead and selected vehicle− to−vehicle distance. If your
vehicle gets closer to the vehicle ahead because of
insufficient automatic deceleration, then the warning tone
warns you to also manually apply brakes.
3 Followup cruising function: After deceleration, your
vehicle cruising speed changes in proportion to the speed
of the vehicle ahead to maintain an appropriate distance
from your vehicle to the vehicle ahead. The
vehicle −to−vehicle distance can be changed. For details,
see “Changing vehicle −to−vehicle distance setting” on
page 346.
4 Acceleration cruising function: If the vehicle ahead
changes lanes, your vehicle cruising speed will be
gradually increased up to the preset speed, and your
vehicle resumes fixed −speed cruising.
CAUTION
Under certain conditions where the vehicle in front
slows drastically, or is stopped, the dynamic radar/laser
cruise control will neither warn you nor decelerate. The
driver must depress the brake pedal to slow down,
ensuring collision avoidance or that sufficient
vehicletovehicle distance is maintained.
When vehicle −to−vehicle distance control mode is activated,
you must still be attentive to road and traf fic conditions. Should
your vehicle speed decrease below about 40 km/h (25 mph),
the dynamic radar/laser cruise control will shut off, requiring
you to apply the brakes to slow. When a vehicle ahead slows
suddenly, stops or a vehicle cuts in front, the system may slow
your vehicle abruptly, but the automatic braking will cease if the
speed decreases below about 40 km/h (25 mph) requiring the
driver’s manual application of brakes.

STARTING AND DRIVING
345
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.

STARTING AND DRIVING
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.
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 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.

STARTING AND DRIVING
353
w280
If the system cannot easily measure the
vehicletovehicle distance because of the following
conditions while the dynamic radar/laser cruise control is
on, the above message appears.
Dynamic radar cruise control—
 The driving pattern selector switch is set to the “SNOW”
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
Dynamic laser cruise control—
 The driving pattern selector switch is set to the “SNOW”
mode.
 It is determined that it is difficult to make a measurement
because of bad weather (such as rainy, foggy, or snowy
weather)
 The wipers are operated at high or low speeds with the
wiper lever in the “AUTO” position.
 Direct sunlight from the front In the following
cases, the dynamic radar/laser cruise
control switches to the “RADAR READY” mode:
Dynamic radar cruise control—
 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.

STARTING AND DRIVING
354Dynamic laser cruise control—

The driving pattern selector switch is changed to the
“normal” or “power” position.
 The wipers are stopped or are switched to intermittent
operation. (Including intermittent and stopped wipers in the
“AUTO” position)
 No direct sunlight from the front
In the above conditions, press the control lever upward in the
“+ RES” direction and release it. The dynamic laser 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.
w281
If the system malfunction is detected when dynamic
radar/laser cruise control is in the “RADAR READY” mode
or operating, the above message appears.
If this message appears, stop your vehicle in a safe place, turn
the ignition 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/laser
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 ignition switch off
and then on again. If the function is cancelled again
after setting or if settings cannot be made, the dynamic
radar/laser cruise control system may be
malfunctioning. Although it is no problem to continue
driving, have your vehicle checked by your Lexus
dealer.

STARTING AND DRIVING
366
“Check VSC” warning message
31L337a
If the vehicle stability control system or the traction
control system malfunctions, the master warning light
and “TRAC OFF” indicator light come on. At this time a
warning tone sounds and the above message appears.
If the message appears, the vehicle stability control system
and traction 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.
BRAKE SYSTEM
The tandem master cylinder brake system is a hydraulic
system with two separate sub −systems. If either sub −system
should fail, the other will still work. However, the pedal will be
harder to press, and your stopping distance will increase. Also,
the brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a single brake
system. Have your brakes fixed immediately.
Brake booster
The brake booster uses engine vacuum to power −assist the
brakes. If the engine should quit while you are driving, you can
bring the vehicle to a stop with normal pedal pressure. There
is enough reserved vacuum for one or two stops but no more!
CAUTION
 Do not pump the brake pedal if the engine stalls.
Each push on the pedal uses up your reserved
vacuum.
 Even if the power assist is completely lost, the brakes
will still work. But you will have to push the pedal
hard, much harder than normal. And your braking
distance will increase.