Lexus HS250h 2010 Owner's Guide

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1-1. Hybrid system
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Before driving
HS250h_U_75033U(Canada)
■If a warning light comes on, a warning message is displayed, or the 12-volt battery
is disconnected
The hybrid system may not start. In that case, try to start the system again. If the
“READY” indicator does not come on, contact your Lexus dealer.
■Electromagnetic waves
●High voltage parts and cables on the hybrid vehicles incorporate electromag-
netic shielding, and therefore emit approximately the same amount of electro-
magnetic waves as conventional gasoline powered vehicles or home electronic
appliances.
●Your vehicle may cause sound interference in some third party produced radio
parts.
●Consult your Lexus dealer before installing or removing third party-produced
radio parts.
■Running out of fuel
When the vehicle has run out of fuel and the hybrid system cannot be started, refuel
the vehicle with at least enough gasoline to make the low fuel level warning light
( → P. 495) go off. If there is only a small amount of fuel, the hybrid system may not
be able to start. (The minimum amount of fuel to add to make the low fuel level
warning light go out is about 2.6 gal. [10 L, 2.1 Imp.gal.], when the vehicle is on a
level surface. This value may vary when the vehicle is on a slope.)
■Hybrid battery (traction battery)
The hybrid battery (traction battery) has a limited service life. The lifespan of the
hybrid battery (traction battery) can change in accordance with driving style and
driving conditions.

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CAUTION
■High voltage precautions
The vehicle has high voltage DC and AC systems as well as a 12-volt system. DC
and AC high voltage is very dangerous and can cause severe burns and electric
shock that may result in death or serious injury.
●Never touch, disassemble, remove or replace the high voltage parts, cables or
their connectors.
●The hybrid system will become hot after starting as the system uses high voltage.
Be careful of both the high voltage and the high temperature, and always obey
the caution labels attached to the vehicle.
■Road accident cautions
Observe the following precautions to reduce the risk of death or serious injury:
●Pull your vehicle off the road, change the shift position to P, apply the parking
brake, and turn the hybrid system off.
●Do not touch the high voltage parts, cables and connectors.
●If electric wires are exposed inside or outside your vehicle, an electric shock may
occur. Never touch exposed electric wires.
●If a fluid leak occurs, do not touch the fluid as it may be strong alkaline electrolyte
from the hybrid battery (traction battery). If it comes into contact with your skin or
eyes, wash it off immediately with a large amount of water or, if possible, boric
acid solution. Seek immediate medical attention.
●If a fire occurs in the hybrid vehicle, leave the vehicle as soon as possible. Never
use a fire extinguisher that is not meant for electric fires. Using even a small
amount of water may be dangerous.
●Never try to open the service plug access
hole located in the luggage compartment.
The service plug is used only when the
vehicle is serviced and is subject to high
voltage.

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1-1. Hybrid system
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Before driving
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CAUTION
●If your vehicle needs to be towed, do so with front wheels raised. If the wheels
connected to the electric motor (traction motor) are on the ground when towing,
the motor may continue to generate electricity. This may cause an electricity
leakage leading to a fire. (
→P. 4 8 3 )
●Carefully inspect the ground under the vehicle. If you find that liquid has leaked
onto the ground, the fuel system may have been damaged. Leave the vehicle as
soon as possible.
■Nickel-metal hydride battery
Your vehicle contains a sealed nickel-metal hydride battery. If disposed of improp-
erly, it is hazardous to the environment and there is a risk of severe burns and elec-
trical shock that may result in death or serious injury.
■Emergency shut off system
Carefully check to see if there are exposed high voltage parts or cables. Never
touch the parts or cables. (
→P. 2 7 )
NOTICE
■Hybrid battery air vent
●Do not put foreign objects near the air vent. The hybrid battery (traction battery)
may overheat and be damaged.
●Clean the air vent regularly to prevent the hybrid battery (traction battery) from
overheating.
●Do not wet or allow foreign substances to enter the air vent as this may cause a
short circuit and damage the hybrid battery (traction battery).
●Do not carry large amounts of water such as water cooler bottles in the vehicle. If
water spills onto the hybrid battery (traction battery), the battery may be dam-
aged. Have the vehicle inspected by your Lexus dealer.

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Energy monitor/consumption screen
Energy monitorNavigation system (if equipped) Press the “MENU” button.
You can view the status of your hybrid system on the multi-information dis-
play and the navigation system screen.
Navigation system screen (if
equipped)
Multi-information display
Remote Touch* “MENU” button
Remote Touch knob
“ENTER” button
*:For use of the Remote Touch,refer to “Navigation System
Owner's Manual”.

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1-1. Hybrid system
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Before driving
HS250h_U_75033U(Canada)Select on the screen
and press the “ENTER” button on
the Remote Touch.
Select and press the
“ENTER” button.
If the or
screen is displayed, select
and press the “ENTER” button.
Multi-information display Toggle the “ENTER” switch on the
steering wheel upward or down-
ward through several items to
select the energy monitor display.

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1-1. Hybrid system
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These images are examples only, and may vary slightly from actual conditions.
Navigation screenMulti-information display
When the vehicle is
powered by the
electric motor
(traction motor)
When the vehicle is
powered by both
the gasoline engine
and the electric
motor (traction
motor)
When the vehicle is
powered by the
gasoline engine
When the vehicle is
charging the hybrid
battery (traction
battery)
When there is no
energy flow
Hybrid battery
(traction battery)
statusLowFullLowFull

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Before driving
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Consumption (vehicles with a navigation system)Press the “MENU” button and select .
Select and press the “ENTER” button.
If the screen does not appear, select and
press the “ENTER” button.
Fuel consumption in the past 30
minutes
Regenerated energy in the past
30 minutes
One symbol indicates 50 Wh. Up
to 4 symbols are shown.
Cruising range ( →P. 36)

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Past record (vehicles with a navigation system)Press the “MENU” button and select .
Select and press the “ENTER” button.
If the screen does not appear, select and
press the “ENTER” button.
Best past fuel consumption
Average fuel consumption
Displays the average fuel consump-
tion between each reset of the total
average fuel consumption on the
multi-information display.
When resetting, if the total average
fuel consumption is better than the
best past fuel consumption, the best
past fuel consumption will be
updated.
These images are examples only, and may vary slightly from actual conditions.
■Resetting the consumption data
Selecting on the screen will reset the average fuel consump-
tion. Selecting on the screen will reset the past records.
Selecting will confirm resetting of all the data (except cruising range).
■Cruising range
Displays the estimated maximum distance that can be driven with the quantity of
fuel remaining.
This distance is computed based on your average fuel consumption.
As a result, the actual distance that can be driven may differ from that displayed.

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1-1. Hybrid system
Before driving
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Hybrid vehicle driving tips
For economical and ecological driving, pay attention to the following
points:
■Using Eco Mode
When using Eco mode, the torque corre sponding to the accelerator pedal
depression amount can be generated more smoothly than it is in normal
conditions. In addition, the operation of the air conditioning system will be
minimized, improving the fuel economy.
( → P. 1 5 5 )
■Use of Hybrid System Indicator
The environmentally-friendly driving is possible by keeping the indicate of
Hybrid System Indicator within Eco area. ( →P. 1 6 4 )
■When braking the vehicle
Make sure to operate the brakes gently and in good time. A greater
amount of electrical energy can be retained when slowing down.
■Delays
Repeated acceleration and deceleration, as well as long waits at traffic
lights, will lead to bad fuel consumption. Check traffic reports before leav-
ing and avoid delays as much as po ssible. When encountering a delay,
gently release the brake pedal to allow the vehicle to move forward slightly
while avoiding overuse of the accelera tor pedal. Doing so can help control
excessive gasoline consumption.
■ Highway driving
Control your speed and keep at a constant speed. Also, before stopping at
a toll booth or similar, allow plenty of time to release the accelerator and
gently apply the brakes. A greater amount of electrical energy can be
retained when slowing down.

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■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 con-
sumption 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 con-
sume 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 carry-
ing 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, frequently driving short
distances will cause the engine to repeatedly warm up, which can lead to
poor fuel consumption.