2010 Lexus GS450h engine

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GS_HV_U (OM30C81U)
February 1, 2010 10:54 am
4-1. Maintenance and care
Cleaning and protecting 
the vehicle exterior................... 442
Cleaning and protecting 
the vehicle interior .................... 445
4-2. Maintenance
Maintenance requirements ..... 448
General maintenance ............... 450
Emission inspection and 
maintenance (I/M) 
programs ...................................... 4534-3. Do-it-yourself maintenance
Do-it-yourself service 
precautions .................................. 454
Hood ................................................. 457
Positioning a floor jack.............. 458
Engine compartment.................. 460
Tires ................................................... 475
Tire inflation pressure................ 485
Wheels ............................................ 489
Air conditioning filter................... 491
Electronic key battery ................ 494
Checking and replacing 
fuses ................................................ 496
Headlight aim ................................... 511
Light bulbs ........................................ 514
5-1. Essential information
Emergency flashers .................... 522
If your vehicle needs to be 
towed ............................................. 523
If you think something is 
wrong .............................................. 531
Event data recorder.................... 532
4Maintenance and care
5When trouble arises

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GS_HV_U (OM30C81U)
February 12, 2010 8:52 am
1-1. Hybrid system
Hybrid system
Your vehicle is a hybrid vehicle. It has characteristics different from con-
ventional vehicles. Be sure you are closely familiar with the characteristics
of your vehicle, and operate with care.
The hybrid system combines a gasoline engine and an electric motor (trac-
tion motor) according to driving conditions, improving fuel efficiency and
reducing exhaust emissions.
Gasoline engine
Electric motor (Traction motor)

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1-1. Hybrid system
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Before driving
GS_HV_U (OM30C81U)
February 12, 2010 8:52 am
■When stopped/during take-off
The gasoline engine stops when the vehicle is stopped. During take-
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.
■During normal driving
The gasoline engine is predominantly used. The electric motor
(traction motor) charges the hybrid battery as necessary.
■When accelerating sharply
The power of the hybrid battery (traction battery) is added via elec-
tric motor (traction motor) to that of the gasoline engine.
■When braking (Regenerative brake)
The electric motor (traction motor) charges the hybrid battery
(traction battery).

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1-1. Hybrid system
GS_HV_U (OM30C81U)
February 12, 2010 8:52 am
■Regenerative braking
The motor generator converts kinetic energy to electric energy when:
●The accelerator pedal is released.
●The brake pedal is depressed with the shift lever in “D” or “S”.
■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
●During low or high hybrid battery (traction battery) temperature
■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 rea-
son, 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 becomes fully discharged and
you are unable to jump-start the vehicle with the 12 volt battery, contact your
Lexus dealer.
●If the shift lever is in “N”, the hybrid battery (traction battery) will not be
charged. When driving in heavy traffic, operate the vehicle with the shift lever in
“D” or “S” to avoid discharging the battery.

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1-1. Hybrid system
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Before driving
GS_HV_U (OM30C81U)
February 12, 2010 8:52 am
■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 vibration even though the vehicle is able to
move. Always put the shift lever in “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 from the engine compartment.
●Sounds may be heard from the hybrid battery (traction battery) behind the rear
seat 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 transmission when the hybrid system starts or
stops.
●Engine sounds may be heard when accelerating sharply.
●Sounds may be heard from the regenerative brake when you press the brake
pedal.
●Vibration may be felt when the gasoline engine starts or stops.
●You may hear cooling fan sounds coming from the air intake vents behind the
rear seat.
■Maintenance, repair, recycling, and disposal
Contact your Lexus dealer regarding maintenance, repair, recycling and disposal.
Do not dispose of the vehicle yourself.

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1-1. Hybrid system
GS_HV_U (OM30C81U)
February 12, 2010 8:52 am
To u c h s c r e e nMulti-information
display
When the vehicle is
powered by the elec-
tric motor (traction
motor)
When the vehicle is
powered by the 
gasoline engine
When the vehicle is
powered by both the
gasoline engine and the
electric motor (traction
motor)
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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2-1. Driving procedures
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■For efficient use
●Put the shift lever into “D” when driving
In the “N” position, the gasoline engine operates but electricity cannot be gen-
erated. The hybrid battery (traction battery) will be discharged requiring unnec-
essary engine power to recharge.
●Drive your vehicle smoothly
Avoid abrupt acceleration and deceleration. Gradual acceleration and decel-
eration will make more effective use of the traction motor without having to use
gasoline engine power.
●Avoid repeated acceleration
Repeated acceleration consumes hybrid battery (traction battery) power,
resulting in poor acceleration. Battery power can be restored by driving with
the accelerator pedal slightly released.
●Put the shift lever into “P” when parking
In the “N” position, the hybrid battery (traction battery) does not recharge.
Leaving the shift lever in the “N” position for an extended period of the time may
discharge the hybrid battery. The vehicle cannot run if the hybrid battery is dis-
charged.
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.

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2-1. Driving procedures
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
CAUTION
■When driving the vehicle
●Moving the shift lever to "N" while the vehicle is moving will disengage the hybrid
system. Engine braking is not available with the hybrid system disengaged.
●During normal driving, do not turn off the hybrid system. Turning the hybrid sys-
tem 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 difficult to steer
and brake, so you should pull over and stop the vehicle as soon as it is safe to do
so.
However, in the event of an emergency, such as if it becomes impossible to stop
the vehicle in the normal way: P. 5 3 4
●Use engine braking (downshift) to maintain a safe speed when driving down a
steep hill. 
Using the brakes continuously may cause the brakes to overheat and lose effec-
tiveness. (P. 1 5 6 )
●When stopped on an inclined surface, use the brake pedal and parking brake to
prevent the vehicle from rolling backward or forward and causing an accident.
●Be careful when driving on slippery surfaces, as the vehicle may spin or skid when
downshifting, rapidly accelerating, braking or turning.
●Do not adjust the position of the steering wheel, the seat, or the inside or outside
rear view mirrors while driving.
Doing so may result in a loss of vehicle control that can cause accidents that may
result in death or serious injury.
●Always check that all passengers’ arms, heads or other parts of their bodies are
not outside the vehicle, as this may result in death or serious injury.
●Do not drive in excess of the speed limit. Even if the legal speed limit permits it, do
not drive over 85 mph (140 km/h) unless your vehicle has high-speed capability
tires. Driving over 85 mph (140 km/h) may result in tire failure, loss of control and
possible injury. Be sure to consult a tire dealer to determine whether the tires on
your vehicle are high-speed capability tires or not before driving at such speeds.
●The driver should pay attention to pedestrians when the vehicle is powered only
by the electric motor (traction motor). Because there is no engine sounds, the
pedestrians may misjudge the vehicle’s movement.