2010 Lexus HS250h start engine

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4-2. MaintenanceMaintenance 
requirements.............................. 409
General maintenance ................... 411
Emission inspection and 
maintenance (I/M) 
programs ....................................... 415
4-3. Do-it-yourself maintenance Do-it-yourself service 
precautions ................................... 416
Hood................................................... 419
Positioning a floor jack............... 420
Engine compartment.................. 422
12-volt battery................................ 433
Tires ................................................... 437
Tire inflation pressure................. 445
Wheels.............................................. 448
Air conditioning filter................. 450
Electronic key battery ................ 453
Checking and replacing 
fuses ................................................ 455
Headlight aim 
(LED headlights) ....................... 467
Light bulbs ....................................... 469 5-1. Essential information
Emergency flashers .................... 482
If your vehicle needs to be 
towed ............................................ 483
If you think something is 
wrong ............................................ 489
Event data recorder.................... 490
5-2. Steps to take in an emergency If a warning light turns on 
or a warning buzzer 
sounds... ......................................... 492
If a warning message is 
displayed........................................ 501
If you have a flat tire...................... 521
If the hybrid system will not 
start ................................................ 530
If you lose your keys .................... 532
If the electronic key does 
not operate prop erly ............... 533
If the vehicle 12-volt battery 
is discharged ............................... 536
If your vehicle overheats ............ 541
If the vehicle becomes 
stuck................................................ 545
5When trouble arises

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1-1. Hybrid system
Hybrid system
Your vehicle is a hybrid vehicle. It has characteristics different from con-
ventional vehicles. Be sure you are clos ely familiar
with the characteristics
of your vehicle, and operate with care.
The hybrid system combines the use of a gasoline engine and an electric
motor (
traction motor) according to driving conditions, improving fuel effi -
ciency and reducing exhaust emissions.
Gasoline engine
Electric motor (Traction motor)
■ When stopped/
during start off
The gasoline engine stops* when the v
ehicle is stopped. During
start off, the electric motor (traction motor) drives the vehicle. At
slow speeds or when traveling down a gentle slope, the engine is
stopped* and the motor is used.
When shift position N is selected, the hybrid batter
y (traction bat-
tery) will not be charged. Thus, sele ct P when the v
ehicle is stopped.
In addition, when driving in heavy traffic, use D or B.

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1-1. Hybrid system
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Before driving
■Regenerative braking
In the following situations, kinetic energy is converted to electric energy and decel-
eration force can be obtained in conjunction with the recharging of the hybrid bat -
tery (traction battery).
●The accelerator pedal is released while driving with shift position D or B
selected.
●The brake pedal is depressed while driving with shift position D or B selected.
■Conditions in which the gasoline engine may not stop
The gasoline engine starts and
stops automatically. However, it may not stop auto -
matically in the following conditions:
●During gasoline engine warm-up
●During hybrid battery (traction battery) charging
●When the temperature of the hybrid battery (traction battery) is high or low
●When the heater is switched on
*: However, when the hybrid battery (traction battery) need to be
charged or while the engine is being warmed up, the gasoline
engine may not stop automatically.
■ During normal driving
The gasoline engine is predomina ntly used. The electric motor
(tr
action motor) charges the hybrid battery as necessary.
■ When acceler
ating sharply
The power of the hybrid battery (tract ion batter
y) is added to that of
the gasoline engine via the electric motor (traction motor).
■ When br
aking (regenerative braking)
The electric motor (traction motor) char
ges the hybrid battery
(traction battery).

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1-1. Hybrid system
■Charging the battery
As the gasoline engine charges the hybrid battery (traction battery), the battery
does not need to be charged from an outside source. However, if the vehicle is left
parked for a long time the hybrid battery will slowly discharge. For this reason, be
sure to drive the vehicle at least once every few months for at least 30 minutes or
10 miles (16 km). If the hybrid battery be comes fully discharged and you are unable
to jump-start the vehicle with the 12-v olt battery, contact your Lexus dealer.
■After the 12-volt battery has discharged or has been changed or removed
The gasoline engine may not stop even if the vehicle is running on the hybrid battery
(traction battery). If this continues for a few days, contact your Lexus dealer.
■Sounds and vibrations specific to a hybrid vehicle
There may be no engine sounds or vibrat ion even though the vehicle is able to
move. Always change the shift position to P when parked.
The following sounds or vibrations may occur when the hybrid system is operating
and are not a malfunction:
●Motor sounds may be heard fr om the engine compartment.
●Sounds may be heard from the hybrid ba ttery (traction battery) behind the rear
seats when the hybrid system starts or stops.
●Sounds from the hybrid system may be heard when the trunk lid is open.
●Sounds may be heard from the transaxle wh en the hybrid system starts or stops,
or while the vehicle is idling.
●Engine sounds may be heard when accelerating sharply.
●Sounds may be heard due to regenerati ve braking when the brake pedal is
depressed and accelerator is loosened.
●Other sounds, such as motors and mechanical noises, may be heard from the
brake system when the brake pedal is depressed.
●Vibration may be felt when the gasoline engine starts or stops.
●Cooling fan sounds may be heard from the air intake vent on the side of rear left
seatback.
When driving in Eco mode, the fan noise may be louder than when driving nor-
mally.
■Maintenance, repair, recycling, and disposal
Contact your Lexus dealer regarding main tenance, repair, recycling and disposal.
Do not dispose of the vehicle yourself.

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1-1. Hybrid system
■Air conditioning
Use the air conditioning only when necessary. Doing so can help control
excessive gasoline consumption. 
In summer: In high temperatures, use the r
ecirculated 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 impr
oved by avoiding overuse of
the heater.
■ Checking tire inflation pressure
Make sure to check the tire inflatio n 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
r
oads can lead to poor fuel consumptio n. 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 la r
ge 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.

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2-1. Driving procedures
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When driving
CAUTION
■When starting the vehicle
Always keep your foot on the brake pedal while stopped with the hybrid system
operating. This prevents the vehicle from creeping.
■When driving the vehicle
●Do not drive if you are unfamiliar with the location of the brake and accelerator
pedals to avoid depressing the wrong pedal.
• Accidentally depressing the accelerator pedal instead of the brake pedal will
result in sudden acceleration that may lead to an accident that could result in
death or serious injury.
• When backing up, you may twist your body around, leading to a difficulty in
operating the pedals. Make sure to operate the pedals properly.
• Make sure to keep a correct driving posture even when moving the vehicle only slightly. This allows you to depress the brake and accelerator pedals
properly.
• Depress the brake pedal using your right foot. Depressing the brake pedal using your left foot may delay response in an emergency, resulting in an acci-
dent.
●The driver should pay extra attention to pedestrians when the vehicle is powered
only by the electric motor (traction motor). Because there is no engine noise, the
pedestrians may misjudge the vehicle’s movement.
●Do not drive the vehicle over or stop the vehicle near flammable materials. 
The exhaust system and exhaust gases can be extremely hot. These hot parts may
cause a fire if there is any flammable material nearby.
●Do not let the vehicle roll backward whil e a forward driving position is selected,
or roll forward while R is selected. 
Doing so may result in an acci dent or damage to the vehicle.
●If the smell of exhaust is noticed inside the vehicle, open the windows and check
that the trunk is closed. Large amounts of exhaust in the vehicle can cause driver
drowsiness and an accident, resulting in death or a serious health hazard. Have
the vehicle inspected by your Lexus dealer immediately.
●Do not shift the shift position to P while the vehicle is moving. 
Doing so can damage the transmission and may result in a loss of vehicle control.
●Do not shift the shift position to R while the vehicle is moving forward. 
Doing so can damage the transmission and may result in a loss of vehicle control.

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2-1. Driving procedures
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When driving
Power (ignition) switch
Performing the following operations when carrying the electronic key on
your person starts the hybrid system or changes “POWER” switch modes.
■Starting the hybrid system
Check that the parking brake is set.
Firmly depress the brake pedal.
The “POWER” switch indicator will turn green. If the indicator does
not turn green, the hybrid system cannot be started.
When shift position N is selected, the hybrid system cannot start.
Select the P position when star
ting the hybrid system.
Press the “POWER” switch.
After a while, the “READY” indi -
cator comes on with a beep
sound.
The vehicle can move when the
“READ
Y” indicator is on even if
the engine is stopped.
Continue depressing the brake
pedal
until the hybrid system is
completely started.
The hybrid system can be
star
ted from any mode.

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2-1. Driving procedures
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When driving
■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-
info
rmation display.
●Engine coolant temperature is low.
●Vehicle speed is about 19mph (30km/h) or more.
●The hybrid battery (traction battery) is low. 
An “Energy Monitor” display of level 3 or lower may indicate a low battery level.
(  P. 3 2 )
● The temperature of the hybrid system is high. 
The vehicle has been left in the sun, driv en on a
hill, driven at high speeds, etc.
●The temperature of the hybrid system is low. 
The vehicle has been left in temperatures lower than about 32°F (0°C) for a
l
ong period of time 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.
■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 mo de is canceled, a buzzer will sound and
the EV drive mode indicator will flash and go off.
●The hybrid battery (traction battery) becomes low. 
The remaining battery level indicated in the “Energy Monitor” display is level 2
or lo
wer. ( P. 3 2)
●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.
When it is possible to inform the driver o
f automatic cancellation in advance, a prior
notice screen will appear on the multi-information display.
■ Possible driving distance when 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.)