2008 Lexus GS450h battery

5
When trouble arises
531
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If the electronic key does not operate properly
Locking and unlocking the doors, unlocking the trunk and key linked
functions
Doors Using the mechanical key in order
to perform the following opera-
tions:
Locks all doors
Closes the windows/moon roof
(turn and hold)
Unlocks the door
Turning the key rearward unlocks
the driver’s door.
Turning the key once again unlocks
the other doors.
Opens the windows/moon roof
(turn and hold)
If communication between the electron ic key and vehicle is interrupted
(
P. 39) or the electronic key cannot be used because the battery is
depleted, the smart access system with push-button start and wireless
remote control cannot be used. In such cases, the doors and trunk can be
opened or the hybrid system can be started by following the procedure
below.

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When trouble arises
533
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
To change the “POWER” switch modes: Within 10 seconds of the
buzzer sounding, release the brake pedal and press the
“POWER” switch. Modes can be changed each time the switch is
pressed. (
P. 1 3 9 )
To start the hybrid system: Press the “POWER” switch within 10
seconds after the buzzer soun ds, keeping the brake pedal
depressed.
If the “POWER” switch still cannot be operated, contact your Lexus
dealer.
■Stopping the hybrid system
Shift the shift lever to “P” and press the “POWER” switch as you normally do when
stopping the hybrid system.
■Replacing the key battery
As the above procedure is the temporary measure, it is recommended that the
electronic key battery be replaced i mmediately when the battery depletes.
(  P. 4 5 4 )
STEP3

534
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If the 12 volt battery is discharged
The following procedures may be used to start the hybrid system if the 12
volt battery is discharged.
You can call your Lexus dealer or qualified repair shop.
If you have a set of jumper (or booster) cables and a second vehicle
with a 12 volt battery, you can jump start your Lexus following the steps
below.
Open the trunk using the mechanical key. (
P. 5 3 2 )
Remove the left-hand cover in
the trunk.
Connecting the jumper cables.STEP1
STEP2
STEP3

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When trouble arises
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5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
Positive (+) battery terminal on your vehicle.
Positive (+) battery terminal on the second vehicle.
Negative (-) battery terminal on the second vehicle.
Negative (-) battery terminal on your vehicle.
Start the engine of the second vehicle. Increase the engine
speed slightly and maintain at that level for approximately 5
minutes to recharge the 12 volt battery of your vehicle.
Open and close any of the door s with the “POWER” switch is
OFF.
Maintain the engine speed on th e second vehicle and turn the
“POWER” switch to the ON mo de, then start the vehicle’s
hybrid system.
Make sure the “READY” light co mes on. If the light does not
come on, contact your Lexus dealer.
Once the vehicle’s hybrid system has started, remove the
jumper cables in the exact reverse order in which they were
connected.
Once the hybrid system starts, have the vehicle checked at your Lexus
dealer as soon as possible.
STEP3
STEP4
STEP5
STEP6
STEP7

536
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
■Starting the hybrid system when the 12 volt battery is discharged
The hybrid system cannot be started by push-starting.
■To prevent 12 volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
●Turn off any unnecessary electrical components when the vehicle is running at a
low speed for an extended period, such as in heavy traffic, etc.
■When the 12 volt battery is removed or discharged
The hybrid system may not start. ( P. 4 3 1 )
Also, the following systems must be initialized.
●Tire pressure warning system (P. 4 3 6 )
●Intuitive parking assist (P. 5 1 2 )
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable
gas that may be emitted from the battery.
●Make sure the jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any pa rt other than the intended terminal.
●Do not allow the jumper cables to come into contact with the “+” and “-” termi-
nals.
●Do not allow open flame or use matches, cigarette lighters or smoke near the
battery.

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When trouble arises
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5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
CAUTION
■Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead compounds. Observe the following precautions when han-
dling the battery:
●When working with the battery, always wear safety glasses and take care not to
allow any battery fluids (acid) to come into contact with skin, clothing or the vehi-
cle body.
●Do not lean over the battery.
●If the battery fluid comes into contact with the skin or eyes, immediately wash the
affected area with water and seek medical attention. 
Place a wet sponge or cloth over the affected area until medical attention can be
received.
●Always wash your hands after handling the battery support, terminals, and other
battery-related parts.
●Do not allow children near the battery.
NOTICE
■When handling jumper cables
Be careful that the jumper cables do not become tangled in the cooling fan or any
of the belts when connecting or disconnecting them.

546
6-1. Specifications
GS_HV_U
December 12, 2007 3:50 pm
Engine
Fuel
Electric motor (Traction motor)
Hybrid battery (Traction battery)
Model2GR-FSE
Ty p e6-cylinder V type, 4-cycle, gasoline
Bore and stroke3.70  3.27 in. (94.0  83.0 mm)
Displacement210.9 cu.in. (3456 cm3)
Drive belt tensionAutomatic adjustment
Fuel typePremium unleaded gasoline only
Octane Rating91 (Research Octane Number 96) or higher
Fuel tank capacity17.2 gal. (65 L, 14.3 lmp.gal.)
Ty p ePermanent magnet synchronous motor
Maximum output147 kW
Maximum torque275 N•m (28.0 kgf•m, 202.8 ft•lbf.)
Ty p eNickel-Metal hydride battery
Vo l t a g e7.2 V/module
Capacity6.5 Ah (3HR)
Quantity40 modules
Overall voltage288 V

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6-1. Specifications
6
Vehicle specifications
GS_HV_U
December 12, 2007 3:50 pm
Electrical system
Differential
“Toyota Genuine Differential Gear Oil” is filled in your Lexus vehicle at fac-
tory fill. Use Lexus approved “Toyota Genuine Differential Gear Oil” or an
equivalent of matching quality to sati sfy the above specification. Please con-
tact your Lexus dealer for further details.
12 volt battery
Open voltage at
68 F (20 C):12.6  12.8V Fully charged 
12.2  12.4V Half charged
11.8  12.0V Discharged 
(Voltage is checked 20 minutes after the
hybrid system and all lights are turned off.)
Charging rates5A max.
Oil capacity1.42 qt. (1.35 L, 1.19 lmp.qt.)
Oil type and
viscosityToyota Genuine Differential Gear Oil LT
75W-85 GL-5 or equivalent