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3464-5. Using the driving support system
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CAUTION
Situations unsuitable for LKA
Do not use LKA in any of the following situations.
Otherwise, the system may not function correctly and could result in an
accident.
When driving with snow tires, tire chains, a spare tire, or similar equip-
ment
When the tires have been excessively worn, or when the tire inflation
pressure is low
When there are objects or structures along the roadside that might be mis-
interpreted as lane markers (such as guardrails, curb, reflector posts, etc.)
When driving on snowy roads
When pavement lane markers are difficult to see due to rain, snow, fog,
sand, dirt, etc.
When there are visible lines on the pavement from road repairs, or if the
remains of old lane markers are still visible on the road
When driving on slippery roads, such as those covered with rain, ice or
snow
When driving in a lane other than the driving or passing lanes on a free-
way or highway
When driving on a road with lane closures due to maintenance, or when
driving in a temporary lane
When towing a trailer
NOTICE
To prevent damage to or incorrect operation of the LKA system
Do not modify the headlights or attach stickers to the surface of the lights.
Do not modify the suspension, or replace them with non-genuine parts.
Do not install or place anything on the hood or the grille. Also, do not
install a grille guard (bull bars, kangaroo bar etc.).
Do not modify the sun visor or replace it with anything other than a genu-
ine Lexus product.
If your windshield needs repairs, contact any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
Page 383 of 1014
3724-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
Shift the shift lever to the R position.
Make sure the monitor displays the part behind the rear tires of
the parked vehicle, and select .
If the area is not displayed, move the vehicle to forward.
With the steering wheel straight, back up slowly to a position
at which the black and yellow vertical pole just overlaps the
rear end of the parked vehicle. Then stop the vehicle.
Black and yellow vertical
pole
Back the vehicle up to
here
2
3
4
1
2
Page 399 of 1014

3884-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
CAUTION
When using the Lexus parking assist monitor system
The Lexus parking assist monitor is a supplemental device intended to
assist the driver when backing up. When backing up, be sure to check visu-
ally behind and all around the vehicle before proceeding.
Observe the following precautions to avoid an accident that could result in
death or serious injuries.
Never depend on the Lexus parking assist monitor entirely when backing
up. The image and the position of the guide lines displayed on the screen
may differ from the actual state.
Use caution, just as you would when backing up any vehicle.
Be sure to back up slowly, depressing the brake pedal to control vehicle
speed.
If you seem likely to hit nearby vehicles, obstacles, people or mount the
shoulder, depress the brake pedal to stop the vehicle, then disable the
assist system by select on the screen to cancel the system.
The instructions given are only guidelines.
When and how much to turn the steering wheel will vary according to
traffic conditions, road surface conditions, vehicle condition, etc. when
parking. It is necessary to be fully aware of this before using the parking
assist system.
When parking, be sure to check that the parking space will accommodate
your vehicle before maneuvering into it.
Do not use the Lexus parking assist monitor in the following cases:
• On icy or slick road surfaces, or in snow
• When using tire chains or emergency tires
• When the trunk lid is not closed completely
• On roads that are not flat or straight, such as curves or slopes.
Page 415 of 1014

4044-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
CAUTION
The ABS does not operate effectively when
The limits of tire gripping performance have been exceeded (such as
excessively worn tires on a snow covered road).
The vehicle hydroplanes while driving at high speed on wet or slick roads.
Stopping distance when the ABS is operating may exceed that of normal
conditions
The ABS is not designed to shorten the vehicle’s stopping distance. Always
maintain a safe distance from the vehicle in front of you, especially in the
following situations:
When driving on dirt, gravel or snow-covered roads
When driving with tire chains
When driving over bumps in the road
When driving over roads with potholes or uneven surfaces
TRC may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the TRC system is operating.
Drive the vehicle carefully in conditions where stability and power may be
lost.
When the VSC is activated
The slip indicator light flashes. Always drive carefully. Reckless driving
may cause an accident. Exercise particular care when the indicator light
flashes.
When the TRC/VSC systems are turned off
Be especially careful and drive at a speed appropriate to the road condi-
tions. As these are the systems to help vehicle stability and driving force,
do not turn the TRC/VSC systems off unless necessary.
Page 416 of 1014
4054-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
CAUTION
Replacing tires
Make sure that all tires are of the specified size, brand, tread pattern and
total load capacity. In addition, make sure that the tires are inflated to the
recommended tire inflation pressure level.
The ABS, TRC and VSC systems will not function correctly if different
tires are installed on the vehicle.
Contact any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional for further information when replacing tires or
wheels.
Handling of tires and the suspension
Using tires with any kind of problem or modifying the suspension will
affect the driving assist systems, and may cause a system to malfunction.
Page 450 of 1014

4334-6. Driving tips
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
the accelerator and gently apply the brakes. A greater amount of
electrical energy can be retained when slowing down.
Air conditioning
Use the air conditioning only when necessary. Doing so can help
control excessive gasoline consumption.
In summer: In high temperatures, use the recirculated air mode.
Doing so will help to reduce the burden on the air conditioner
and reduce fuel consumption as well.
In winter: Because the gasoline engine will not automatically cut
out until the gasoline engine and the interior of the vehicle are
warm, it will consume fuel. Also, fuel consumption can be
improved by avoiding overuse of the heater.
Checking tire inflation pressure
Make sure to check the tire inflation pressure frequently.
Improper tire inflation pressure can cause poor fuel consumption.
Also, as snow tires can cause large amounts of friction, their use
on dry roads can lead to poor fuel consumption. Use a tire that is
appropriate for the season.
Luggage
Carrying heavy luggage can lead to poor fuel consumption.
Avoid carrying unnecessary luggage. Installing a large roof rack
can also cause poor fuel consumption.
Warming up before driving
Since the gasoline engine starts up and cuts out automatically
when cold, warming up the engine is unnecessary. Moreover, fre-
quently driving short distances will cause the engine to repeat-
edly warm up, which can lead to poor fuel consumption.
Page 451 of 1014
4344-6. Driving tips
GS450h_300h_OM_OM30D53E_(EE)
Winter driving tips
Use fluids that are appropriate to the prevailing outside tempera-
tures.
• Engine oil
• Engine/power control unit coolant
• Washer fluid
Have a service technician inspect the condition of the 12-volt
battery.
Have the vehicle fitted with four snow tires or purchase a set of
tire chains for the rear tires.
*
Ensure that all tires are the specified size and brand, and that chains
match the size of the tires.
*: Tire chains cannot be mounted on vehicles with front and rear tires of
differing sizes and vehicles with LDH and 19 inch tires
Carry out the necessary preparations and inspections before driv-
ing the vehicle in winter. Always drive the vehicle in a manner
appropriate to the prevailing weather conditions.
Preparation for winter
Page 452 of 1014

4354-6. Driving tips
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
Perform the following according to the driving conditions:
Do not try to forcibly open a window or move a wiper that is fro-
zen. Pour warm water over the frozen area to melt the ice. Wipe
away the water immediately to prevent it from freezing.
To ensure proper operation of the climate control system fan,
remove any snow that has accumulated on the air inlet vents in
front of the windshield.
Check for and remove any excess ice or snow that may have
accumulated on the exterior lights, vehicle’s roof, chassis, around
the tires or on the brakes.
Remove any snow or mud from the bottom of your shoes before
getting in the vehicle.
Accelerate the vehicle slowly, keep a safe distance between you
and the vehicle ahead, and drive at a reduced speed suitable to road
conditions.
Park the vehicle and move the shift lever to P without setting the
parking brake. The parking brake may freeze up, preventing it from
being released. If necessary, block the wheels to prevent inadver-
tent sliding or creeping.
Before driving the vehicle
When driving the vehicle
When parking the vehicle