battery Lexus HS250h 2010 Basic Information Before Operation / LEXUS 2010 HS250H (OM75006U) Workshop Manual

416
4-3. Do-it-yourself maintenance
Do-it-yourself service precautions
If you perform maintenance by yourself, be sure to follow the correct pro-
cedure as given in these sections.
ItemsPa r t s a n d t o o l s
12-volt battery condition ( P. 4 3 3 )
•Grease
• Conventional wrench 
(for terminal clamp bolts)
Brake fluid level ( P. 4 3 1 )
• FMVSS No.116 DOT 3 or SAE
J1703 brake fluid
•Rag or paper towel
• Funnel (used only for adding brake
fluid)
Engine/power control unit coolant
level ( P. 4 2 8 )
• “Toyota Super Long Life Coolant”
or a similar high quality ethylene
glycol based non-silicate, non-
amine, non-nitrite and non-borate
coolant with long-life hybrid
organic acid technology.
For the U.S.A.: 
“Toyota Super Long Life Coolant”
is pre-mixed with 50% coolant and
50% deionized water.
For Canada: 
“Toyota Super Long Life Coolant”
is pre-mixed with 55% coolant and
45% deionized water.
• Funnel (used only for adding cool- ant)

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4-3. Do-it-yourself maintenance
4
Maintenance and care
12-volt battery
■Location
The 12-volt battery is located on
the right-hand side of the lug-
gage compartment.
■ Open the co
ver
Lift up the hook and remove the
pa
nel.
Open the cover.

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4-3. Do-it-yourself maintenance
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flammable
and
explosive. Therefore, observe the following precautions before recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to discon -
nect the ground cable.
●Make sure the power switch on the charger is off when connecting and discon -
necting the charger cables to the 12-volt battery.
■After recharging/reconnecting the 12-volt battery
●Unlocking the doors using the smart ke y system may not be possible immedi-
ately after disconnecting the 12
-volt battery. If this happens, use the wireless
remote control or the mechanical key to lock/unlock the doors.
●Start the hybrid system with the “P OWER” switch in ACCESSORY mode. The
hybrid system may not start with the “POWER” switch turned OFF. However,
the hybrid system will operate normally from the second attempt.
●The “POWER” switch mode is recorded by the vehicle. If the battery is recon -
nected, the vehicle will return the “POWER” switch mode to the status it was in
be
fore the battery was disconnected. Make sure to turn off the power before
disconnect the battery. Take extra care when connecting the battery if the
“POWER” switch mode prior to discharge is unknown.
If the system will not start even after mult i
ple attempts, contact your Lexus dealer.
■Exterior
Make sure that the 12-volt ba ttery terminals are not corroded and
that there are no loose connect ions, cracks or loose clamps.
Terminals
Hold-down clamp

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4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■Chemicals in the 12-volt battery
The 12-volt battery contains poisonous and corrosive sulfuric acid and may pro-
duce hydrogen gas which is flammable and explosive. To reduce the risk of death or
serious injury, take the following precautions while working on or near the 12-volt
battery:
●Do not cause sparks by touching the 12-volt battery terminals with tools.
●Do not smoke or light a match near the 12-volt battery.
●Avoid contact with eyes, skin and clothes.
●Never inhale or swallow electrolyte.
●Wear protective safety glasses when working near the 12-volt battery.
●Keep children away from the 12-volt battery.
■Where to safely charge the 12-volt battery
Always charge the 12-volt battery in an open area. Do not charge the 12-volt bat-
tery in a garage or closed room where there is insufficient ventilation.
■How to recharge the 12-volt battery
Only perform a slow charge (5 A or le ss). The 12-volt battery may explode if
charged at a quicker rate.
■Emergency measures regarding electrolyte
●If electrolyte gets in your eyes 
Flush your eyes with clean water for at least 15 minutes and get immediate medi-
cal attention. If possible, continue to apply water with a sponge or cloth while
traveling to the nearest medical facility.
●If electrolyte gets on your skin 
Wash the affected area thoroughly. If you feel pain or burning, get medical atten-
tion immediately.
●If electrolyte gets on your clothes 
It can soak through clothing on to your skin. Immediately take off the clothing and
follow the procedure above if necessary.
●If you accidentally swallow electrolyte 
Drink a large quantity of water or milk. Get emergency medical attention imme-
diately.

436
4-3. Do-it-yourself maintenance
CAUTION
■When replacing the 12-volt battery
Use a 12-volt battery designed for this vehicle. Failure to do so may cause gas
(hydrogen) to enter the passenger compartment, causing a fire or explosion.
For replacement of the 12-volt battery, contact your Lexus dealer.
NOTICE
■When recharging the 12-volt battery
Never recharge the 12-volt battery while the hybrid system is operating. Also, be
sure all accessories are turned off.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
Electronic key battery
Replace the battery with a new one if it is depleted.
■You will need the following items:
●F
lathead screwdriver
●Small Phillips-head sc rewd
river
● Lithium batter
y (CR1632)
■ R
eplacing the battery
Take out the mechanical key.
Remove the cover.
To prevent damage to the key,
cover the tip of the screwdriver
with a rag.
Remove the depleted battery.
Insert a new battery with the “+”
terminal facing up.

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4-3. Do-it-yourself maintenance
■Use a CR1632 lithium battery
●Batteries can be purchased at your Lexus dealer, local electrical appliance
shops or camera stores.
●Replace only with the same or equivalent type recommended by the manufac -
turer.
●Dispose of used batteries according to local laws.
■When the card key battery needs to be replaced (if equipped)
The battery for the card key is available only at Lexus dealers. Your Lexus dealer
ca
n replace the battery for you.
■If the electronic key battery is depleted
The following symptoms may occur:
●The smart access system with push-button start and wireless remote control will
not function properly.
●The operational range will be reduced.
CAUTION
■Removed battery and other parts
Keep away from children. 
These parts are small and if swallowed by a child, they can cause choking.
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
●Always work with dry hands. 
Moisture may cause the battery to rust.
●Do not touch or move any other comp onents inside the remote control.
●Do not bend either of the battery terminals.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
35SPARE30 ASpare fuse
36SPARE10 ASpare fuse
37SPARE7. 5 ASpare fuse
38EFI MAIN20 AEFI NO.2, fuel system
39BATT FAN10 ABattery cooling fan
40IG220 A
Hybrid system, multiport fuel injec-
tion system/sequential multiport fuel
injection system, MET, IGN
FuseAmpereCircuit

When trouble arises5
481
5-1. Essential informationEmergency 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 properly.......... 533
If the vehicle 12-volt 
battery is discharged ......... 536
If your vehicle overheats ...... 541
If the vehicle becomes 
stuck........................................ 545

482
5-1. Essential information
Emergency flashers
NOTICE
■To prevent 12-volt battery discharge
Do not leave the emergency flashers on longer than necessary when the hybrid sys-
tem is not operating.
Use the emergency flashers if the vehicle malfunctions or is involved in an
accident.
Press the switch to flash all the
turn signal lights. To turn them
off, press the switch once again.