Lexus HS250h 2012 Owner's Guide

30
1-1. Hybrid system
HS250h_U_75050U
Hybrid system precautions
Take care when handling the hybrid system, as it contains a high voltage
system (about 650V at maximum) as well as parts that become extremely
hot when the hybrid system is operat ing. Obey the caution labels attached
to the vehicle.
Air conditioning compressor
Power control unit
Hybrid battery (traction bat-
tery) and DC/DC converter
Service plug High voltage cables (orange)
Electric motor (traction motor)
Caution label

31
1-1. Hybrid system
1
Before driving
HS250h_U_75050U
Hybrid battery air ventThere is an air intake vent on the
side of the rear left seatback for
the purpose of cooling the hybrid
battery (traction battery). If the
vent become blocked, the hybrid
battery may overheat, leading to a
reduction in hybrid battery output.
Emergency shut off system When a certain level of impact is detected by the impact sensor, the
emergency shut off system blocks off the high voltage current and stops
the fuel pump to minimize the risk of electrocution and fuel leakage. If the
emergency shut off system activates, your vehicle will not restart. To
restart the hybrid system, contact your Lexus dealer.
Hybrid warning messageA message is automatically displayed when a malfunction occurs in the
hybrid system or an improper operation is attempted. If a warning message is shown on
the multi-information display, read
the message and follow the
instructions.
(→P. 5 1 2 )

32
1-1. Hybrid system
HS250h_U_75050U
■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.
■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. 505) 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.

33
1-1. Hybrid system
1
Before driving
HS250h_U_75050U
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:
●Stop the vehicle in a safe place to prevent subsequent accidents.
When stopping the vehicle, first depress and hold down the brake pedal. With the
brake pedal depressed, firmly apply the parking brake, shift the shift position to P,
and then stop the hybrid system. Finally, slowly release the brake pedal.
●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.

34
1-1. Hybrid system
HS250h_U_75050U
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 9 5 )
●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. 3 0 )
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.

35
1
1-1. Hybrid system
Before driving
HS250h_U_75050U
Energy monitor/consumption screen
Energy monitorNavigation system (if equipped) Press the “MENU” button on the
Remote Touch.
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”.

36
1-1. Hybrid system
HS250h_U_75050USelect on the screen
and press the “ENTER” button on
the Remote Touch.
Select and press the
“ENTER” button on the Remote
Touch.
If the or
screen is displayed, select
and press the “ENTER” button on
the Remote Touch.
Multi-information display Toggle the “ENTER” switch on the
steering wheel upward or down-
ward through several items to
select the energy monitor display.

37
1-1. Hybrid system
1
Before driving
HS250h_U_75050U
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

38
1-1. Hybrid system
HS250h_U_75050U
Consumption (vehicles with a navigation system)
Press the “MENU” button on the Remote Touch and select .
Select and press the “ENTER” button on the Remote
Touch.
If the screen does not appear, select and
press the “ENTER” button on the Remote Touch.
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. 39)

39
1-1. Hybrid system
1
Before driving
HS250h_U_75050U
Past record (vehicles with a navigation system)Press the “MENU” button on the Remote Touch and select .
Select and press the “ENTER” button on the Remote
To u c h .
If the screen does not appear, select and
press the “ENTER” button on the Remote Touch.
Best past fuel consumption
Average fuel consumption
Displays the average fuel con-
sumption 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.