2012 Lexus HS250h battery

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2-1. Driving procedures
HS250h_U_75050U
■Auto power off function
When the shift position is in P, if the vehicle is left in ACCESSORY or ON mode
with the hybrid system not operating for more than 20 minutes (ACCESSORY
mode) or one hour (ON mode), the “POWER” switch will automatically turn off.
However, this function cannot entirely prevent the 12-volt battery from discharging.
Do not leave the vehicle with the “POWER” switch in ACCESSORY or ON mode
for long periods of time when the hybrid system is not operating.
■Sounds and vibrations specific to a hybrid vehicle
→P. 2 8
■Electronic key battery depletion
→P. 5 5
■When the ambient temperature is low, such as during winter driving conditions
It may take time until the “READY” indicator to come on.
■Conditions affecting operation
→P. 5 2
■Notes for the entry function
→P. 5 3
■If the hybrid system does not start
The immobilizer system may not have been deactivated. ( →P. 101)
■When the “POWER” switch indicator flashes in amber
The system may be malfunctioning. Have the vehicle inspected by your Lexus
dealer immediately.
■If the “READY” indicator does not come on
If the “READY” indicator does not come on when you press the “POWER” switch
with the shift position in P and the brake pedal depressed, contact your Lexus
dealer immediately.
■If the hybrid system is malfunctioning
→ P. 5 1 2
■If the electronic key battery is depleted
→P. 4 6 7

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2-1. Driving procedures
HS250h_U_75050U
CAUTION
■When starting the hybrid system
Always start the hybrid system while sitting in the driver’s seat. Do not depress the
accelerator pedal while starting the hybrid system under any circumstances.
Doing so may cause an accident resulting in death or serious injury.
■Stopping the hybrid system in an emergency
If you want to stop the hybrid system in an emergency while driving the vehicle,
press and hold the “POWER” switch for more than 3 seconds.
However, do not touch the “POWER” switch while driving except in an emergency.
Turning the hybrid system off while driving will not cause loss of steering or braking
control, but the power assist to these systems will be lost. This will make it more diffi-
cult to steer and brake, so you should pull over and stop the vehicle as soon as it is
safe to do so.
NOTICE
■To prevent 12-volt battery discharge
●Do not leave the “POWER” switch in ACCESSORY or ON mode for long peri-
ods of time without the hybrid system on.
●If the hybrid system is off, but the indicator on the “POWER” switch is illuminated,
this indicates that the “POWER” switch is still turned on. When exiting the vehi-
cle, always check that the “POWER” switch is off.
■When starting the hybrid system
Do not depress the accelerator pedal unnecessarily.
■Symptoms indicating a malfunction with the “POWER” switch
If the “POWER” switch seems to be operating somewhat differently than usual,
such as the switch sticking slightly, there may be a malfunction. Contact your Lexus
dealer immediately.

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2-1. Driving procedures
2
When driving
HS250h_U_75050U
EV drive mode
In EV drive mode, the electric motor (traction motor), powered by the
hybrid battery (traction battery), is used to drive the vehicle.
This mode allows you to drive in residential areas late at night, or in indoor
parking lots etc. without concern for noises and exhaust gas emissions.
Turns EV drive mode on/off
When EV drive mode is turned
on, the EV drive mode indicator
will come on. Pressing the
switch when in EV drive mode
will return the vehicle to normal
driving (using the gasoline
engine and electric motor [trac-
tion motor]).

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2-1. Driving procedures
HS250h_U_75050U
■Situations in which EV drive mode cannot be turned on
It may not be possible to turn EV drive mode on in the following situations. If it can-
not be turned on, a buzzer will sound and a message will be shown on the multi-
information display.
●Vehicle speed is about 19mph (30km/h) or more.
●The hybrid battery (traction battery) is low.
In general, the remaining battery level indicated in the “Energy Monitor” display
is level 3 or lower. (→P. 3 5 )
● The temperature of the hybrid system is high.
The vehicle has been left in the sun, driven on a hill, driven at high speeds, etc.
●The gasoline engine is warming up.
●The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
●The windshield defogger is in use.
■Switching to EV drive mode when the gasoline engine is cold
If the hybrid system is started while the gasoline engine is cold, the gasoline engine
will start automatically after a short period of time in order to warm up. In this case,
you will become unable to switch to EV drive mode.
After the hybrid system has started and the “READY” indicator has illuminated,
press the EV drive mode switch before the gasoline engine starts to switch to EV
drive mode.
■Automatic cancellation of EV drive mode
When driving in EV drive mode, the gasoline engine may automatically restart in
the following situations. When EV drive mode is canceled, a buzzer will sound and
the EV drive mode indicator will flash and go off.
●The hybrid battery (traction battery) becomes low.
In general, the remaining battery level indicated in the “Energy Monitor” display
is level 2 or lower. ( →P. 3 5 )
●Vehicle speed becomes more than about 19 mph (30 km/h).
●The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
■ Possible driving distance wh en driving in EV drive mode
In EV drive mode, it is possible to drive up to about several hundred yards if driving
at a speed of about 19 mph (30 km/h) or less. (The distance that is possible
depends on the hybrid battery [traction battery] level and driving conditions.)

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2-1. Driving procedures
2
When driving
HS250h_U_75050U
CAUTION
■P position switch
Do not press the P position switch while the vehicle is moving.
If the P position switch is pressed when driving at extremely low speeds (for exam-
ple, directly before stopping the vehicle), the vehicle may stop suddenly when the
shift position switches to P, which could lead to an accident.
NOTICE
■Situations where P position control system malfunctions are possible
If any of the following situations occurs, P position control system malfunctions are
possible.
Immediately stop the vehicle in a safe place on level ground, apply the parking
brake, and then contact your Lexus dealer.
●When the “P Lock Malfunction” warning message appears on the multi-informa-
tion display. (→P. 5 1 3 )
●When the P position switch indicator flashes.
●When the shift position symbols (such as P and R) are flashing on the shift posi-
tion indicator.
●When the shift position indicator remains off.
■When in heavy traffic
If shift position N is selected, the hybrid battery (traction battery) will not be
charged. To help prevent the battery from discharging, avoid leaving the N position
selected for an extended period of time.
■If the vehicle will not shift out of the P position
There is a possibility that the 12-volt battery is discharged. Check the 12-volt battery
in this situation.
■Notes regarding shift lever and P position switch operation
Avoid repeatedly operating the shift lever and P position switch in quick succession.
The system protection function may activate and temporarily prevent the vehicle
from shifting out of the P position. If this happens, please wait for around 15 seconds
before attempting to change the shift position again.

171
2-2. Instrument cluster
2
When driving
HS250h_U_75050U
■Instrument panel brightness adjustment
The instrument panel brightness levels when the tail lights are on and off can be
adjusted. However, when the surroundings are bright (daytime, etc.) turning on the
tail lights will not change the instrument panel brightness.
■Limitations of brightness adjustment
The brightness of the instrument panel lights is automatically adjusted based on the
light sensor detecting how bright the surroundings are. However, if the instrument
panel brightness has been manually set to the brightest setting, the automatic
adjustment will not be performed.
■Hybrid System Indicator
●By keeping the indicator needle within Eco area, Eco-friendly driving can be
achieved.
Hybrid Eco area shows that gasoline engine power is not being used very often.*
1
●Charge area indicates regeneration*2 status. Regenerated energy will be used
to charge the hybrid battery.
*
1: The gasoline engine will automatically stop and restart under various condi- tions.
*
2: When used in this manual, “regeneration” refers to the conversion of energy created by the movement of the vehicle into electrical energy.
■Customization
Settings (e.g. Sensitivity of the ambient light sensor used for dimming the meter
lights) can be changed. (Customizable features →P. 5 8 4 )
Eco area
Eco Driving Indicator Light turns on
Hybrid Eco area
Eco Driving Indicator Light turns on
Charge area
Eco Driving Indicator Light turns on
Powe r a re a
Eco Driving Indicator Light turns off

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2-2. Instrument cluster
HS250h_U_75050U
■Outside temperature display
In the following situations, the correct outside temperature may not be displayed, or
the display may take longer than normal to change.
●When stopped, or driving at low speeds (less than 15 mph [25 km/h])
●When the outside temperature has changed suddenly (at the entrance/exit of a
garage, tunnel, etc.)
■When disconnecting and reconnecting battery terminals
The following information will be reset:
●Total distance/Total average fuel consumption
●Average fuel consumption after refueling
●Cruising range
●Average vehicle speed
■Customization
Settings (e.g. available languages) can be changed.
(Customizable features →P. 5 8 4 )
CAUTION
■Caution while driving
When operating the electronic feature control while driving, take extra notice of the
vehicle’s surrounding area.
NOTICE
■The multi-information display at low temperatures
Allow the interior of the vehicle to warm up before using the liquid crystal informa-
tion display. At extremely low temperatures, the information display monitor may
respond slowly, and display changes may be delayed.

195
2-3. Operating the lights and windshield wipers
2
When driving
HS250h_U_75050U
■Automatic light off system
●When the headlights come on: The headlights and tail lights turn off 30 seconds
after a door is opened and closed if the “POWER” switch is turned to ACCES-
SORY mode or turned off. (The lights turn off immediately if on the key is
pressed after all the doors are locked.)
●When only the tail lights come on: The tail lights turn off automatically if the
“POWER” switch is turned to ACCESSORY mode or turned off and the
driver’s door is opened.
To turn the lights on again, turn the “POWER” switch to ON mode, or turn the light
switch off once and then back to or .
■Automatic headlight leveling system (if equipped)
The level of the headlights is automatically adjusted according to the number of
passengers and the loading condition of the vehicle to ensure that the headlights do
not interfere with other road users.
■ If the “AFS OFF” indicator flashes (if equipped)
It may indicate a malfunction in the system. Contact your Lexus dealer.
■Customization
Settings (e.g. light sensor sensitivity) can be changed.
(Customizable features →P. 5 8 4 )
NOTICE
■To prevent 12-volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is off.