2011 Lexus HS250h key

440
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 key system may not be possible immedi-
ately after reconnecting the 12-volt batt ery. 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 ba ttery terminals are not corroded and
that there are no loose connect ions, cracks or loose clamps.
Terminals
Hold-down clamp

459
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:
●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.

460
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
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 coul d 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 comp onents inside the remote control.
●Do not bend either of the battery terminals.

When trouble arises5
487
5-1. Essential informationEmergency flashers .............. 488
If your vehicle needs to be towed ................................ 489
If you think something is wrong ...................................... 495
Event data recorder.............. 496
5-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer
sounds... ................................. 498
If a warning message is displayed................................ 507
If you have a flat tire............... 527
If the hybrid system will not start ......................................... 537
If you lose your keys .............. 539
If the electronic key does not operate properly.......... 540
If the vehicle 12-volt battery is discharged......................... 543
If your vehicle overheats ..... 548
If the vehicle becomes stuck........................................ 552
If your vehicle has to be stopped in
an emergency ...................... 554

5
When trouble arises
519
5-2. Steps to take in an emergency
Have the malfunction repaired immediatelyAfter taking the specified steps to co rrect the suspected problem, check
that the warning message and light go off.
Interior
buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure
Once
(Flashes)
The electronic key
is not detected
when an attempt
is made to start
the hybrid system.Start the hybrid
system with the
electronic key
present.
Once3 times
(Flashes)
The electronic key
was carried out-
side the vehicle
and a door other
than the driver's
door was opened
and closed while
the “POWER”
switch was in a
mode other than
off.
Bring the elec-
tronic key back
into the vehicle.
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
the shift position P
was selected with-
out turning off the
“POWER” switch.
Tu r n t h e
“POWER” switch
off or bring the
electronic key
back into the vehi-
cle.

520
5-2. Steps to take in an emergency
OnceCon-
tinuous
(Displayed alternately)(Flashes)
An attempt was
made to exit the
vehicle with the
electronic key and
lock the doors
without first turn-
ing the “POWER”
switch off.
Tu r n t h e
“POWER” switch
off and lock the
doors again.
Once
(Flashes)
An attempt was
made to start the
hybrid system
without the elec-
tronic key being
present, or the
electronic key was
not functioning
normally.
An attempt was
made to drive
when the regular
key was not inside
the vehicle.
Confirm that the
electronic key is
inside the vehicle.
Con-
tinuous
(Flashes)
The driver’s door
was opened while
any shift position
other than P was
selected without
turning off the
“POWER” switch.
Change the shift
position to P.
Interior buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure

5
When trouble arises
521
5-2. Steps to take in an emergency
Con-
tinuousCon-
tinuous
(Displayed alternately)(Flashes)
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
any shift position
other than P was
selected without
turning off the
“POWER” switch.
• Change the shift position to P.
• Bring the elec- tronic key back
into the vehicle.
OnceCon-
tinuous
(Flashes)
An attempt was
made to lock the
doors using the
smart access sys-
tem with push-
button start while
the electronic key
was still inside the
vehicle.
Retrieve the elec-
tronic key from
the vehicle and
lock the doors
again.
Interior buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure

522
5-2. Steps to take in an emergency
Con-
tinuous
(Flashes)
An attempt was
made to lock
either front door
by opening a door
and putting the
inside lock button
into the lock posi-
tion, then closing
the door by pull-
ing on the outside
door handle with
the electronic key
still inside the
vehicle.
Retrieve the elec-
tronic key from
the vehicle and
lock the doors
again.
Interior buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure