key battery Lexus HS250h 2012 User Guide

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1-3. Opening, closing and locking the doors
1
Before driving
HS250h_U_75050U
■Pa n i c m o d e
■Security feature
→P. 5 1
■Alarm
Using the wireless remote control to lock the doors will set the alarm system.
(→ P. 1 0 3 )
■Conditions affecting operation
→P. 5 2
■If the wireless remote control does not operate properly
Locking and unlocking the doors, unlocking the trunk: Use the mechanical key.
(→ P. 5 4 4 )
■Electric key battery depletion
→P. 5 5
■When the electric key battery is fully depleted
→P. 4 6 7
■Customization
Settings (e.g. door unlocking function) can be changed.
(Customizable features →P. 5 8 4 ) When is pressed for longer than about
one second, an alarm will sound intermit-
tently and the vehicle lights will flash to deter
any person from trying to break into or dam-
age your vehicle.
To stop the alarm, press any button on the
electronic key.

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1-5. Opening and closing the windows and moon roof
HS250h_U_75050U
■Door lock linked window operation
●The power windows can be opened and closed using the mechanical key. *
(→ P. 5 4 4 )
●The power windows can be opened using the wireless remote control. *
(→ P. 5 8 )
*: This setting must be customized at your Lexus dealer.
■When the 12-volt battery is disconnected
The window lock switch is disabled. If necessary, press the window lock switch after
reconnecting the battery.
■Customization
Settings (e.g. linked door lock operation) can be changed.
(Customizable features →P. 5 8 4 )
CAUTION
■Closing the windows
Observe the following precautions.
Failing to do so may result in death or serious injury.
●Check to make sure that all passengers do not have any part of their body in a
position where it could be caught when a window is being operated.
●Do not allow children to operate the power windows.
Closing a power window on someone can cause serious injury, and in some
instances, even death.
●To prevent inadvertent power windows operation, never let a small child have and
use the wireless remote control. ( →P. 5 8 )
Closing a power window on someone can cause serious injury, and in some
instances, even death.
■Jam protection function
●Never use any part of your body to intentionally activate the jam protection func-
tion.
●The jam protection function may not work if something gets caught just before
the window fully closes.

105
1-7. Theft deterrent system
1
Before driving
HS250h_U_75050U
■Triggering of the alarm
The alarm may be triggered in the following situations:
(Stopping the alarm deactivates the alarm system.)
■When the 12-volt battery is disconnected
Be sure to cancel the alarm system.
If the 12-volt battery is disconnected before canceling the alarm, the system may be
triggered when the battery is reconnected.
■Alarm-operated door lock
●When the alarm is operating, the doors are locked automatically to prevent
intruders.
●Do not leave the key inside the vehicle when the alarm is operating, and make
sure the key is not inside the vehicle when recharging or replacing the 12-volt
battery.
NOTICE
■To ensure the system operates correctly
Do not modify or remove the system. If modified or removed, the proper operation
of the system cannot be guaranteed.
●A person inside the vehicle opens a door,
the trunk or hood.
●The 12-volt battery is recharged or
replaced when the vehicle is locked.

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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

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.

376
3-5. Using the interior lights
HS250h_U_75050U
■Illuminated entry system
The lights automatically turn on/off according to “POWER” switch mode, the pres-
ence of the electronic key, whether the doors are locked/unlocked, and whether
the doors are opened/closed.
■To prevent 12-volt battery discharge
If the interior lights remain on when the door is not fully closed and the interior light
switch (door position on/ off) is on, the lights will go off automatically after 20 min-
utes.
■Customization
Settings (e.g. the time elapsed before the lights turn off) can be changed. (Custom-
izable features →P. 5 8 4 )
Personal lights

Maintenance and care4
415
HS250h_U_75050U
4-1. Maintenance and careCleaning and protecting the vehicle exterior.............. 416
Cleaning and protecting the vehicle interior .............. 420
4-2. Maintenance Maintenance requirements ........................ 423
General maintenance .......... 426
Emission inspection and maintenance (I/M)
programs............................... 430 4-3. Do-it-yourself maintenance
Do-it-yourself service precautions ............................ 431
Hood .......................................... 434
Positioning a floor jack ......... 435
Engine compartment ........... 437
12-volt battery ........................ 447
Tires............................................. 451
Tire inflation pressure........... 459
Wheels ...................................... 462
Air conditioning filter ........... 464
Electronic key battery........... 467
Checking and replacing fuses ........................................ 469
Light bulbs................................. 481

448
4-3. Do-it-yourself maintenance
HS250h_U_75050U
■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 key system may not be possible immedi-
ately after reconnecting 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 “POWER” 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
before 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.
■Exterior
Make sure that the 12-volt battery terminals are not corroded and
that there are no loose connections, cracks or loose clamps.
Te r m i n a l s
Hold-down clamp

467
4-3. Do-it-yourself maintenance
4
Maintenance and care
HS250h_U_75050U
Electronic key battery
Replace the battery with a new one if it is depleted.
■You will need th e following items:
● Flathead screwdriver
● Small flathead screwdriver
● Lithium battery (CR1632)
■ Replacing 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
HS250h_U_75050U
■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
can 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. Failure to do so could result in death or serious injury.
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 components inside the remote control.
●Do not bend either of the battery terminals.