Page 541 of 628

5278-2. Steps to take in an emergency
8
When trouble arises
IS300h_EE(OM53B95E)
Once3
times
The electronic key was carried
outside 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 electronic key back
into the vehicle.
The driver’s door was opened
and closed while the electronic
key was not in the vehicle, the
shift lever was in P and the
power switch was not turned off.
Turn the power switch off.
Bring the electronic key back
into the vehicle.
9
times
An attempt was made to drive
when the electronic key was not
inside the vehicle.
Confirm that the electronic
key is inside the vehicle.
Con-
tinu-
ous
An attempt was made to lock the
doors using the smart entry &
start system while the electronic
key was still inside the vehicle.
Retrieve the electronic key
from the vehicle and lock the
doors again.
Once
Con-
tinu-
ous
An attempt was made to lock
either front door by opening a
door and putting the inside lock
button into the lock position,
then closing the door by pulling
on the outside door handle with
the electronic key still inside the
vehicle.
Retrieve the electronic key
from the vehicle and lock the
doors again.
Interior
buzzerExterior
buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)
(Vehicles with the entry function)
(Flashes)
Page 542 of 628

5288-2. Steps to take in an emergency
IS300h_EE(OM53B95E)
Once
The electronic key has a low bat-
tery.
Replace the electronic key
battery. (P. 472)
Once
The steering lock could not be
released within 3 seconds of the
power switch being pressed.
Press the power switch while
depressing the brake pedal
and moving the steering wheel
left and right.
Once
Indicates a malfunction in the
smart entry & start system
Have the vehicle inspected by
any authorized Lexus dealer
or repairer, or another duly
qualified and equipped profes-
sional.
Once
• When the doors were unlocked
with the mechanical key and
then the power switch was
pressed, the electronic key
could not be detected in the
vehicle.
• The electronic key could not
be detected in the vehicle even
after the power switch was
pressed two consecutive times.
Touch the electronic key to
the power switch while
depressing the brake pedal.
Once
During a hybrid system starting
procedure in the event that the
electronic key was not function-
ing properly (P. 550), the
power switch was touched with
the electronic key.
Press the power switch within
10 seconds of the buzzer
sounding.
Interior
buzzerExterior
buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)
Page 560 of 628

5468-2. Steps to take in an emergency
IS300h_EE(OM53B95E)
One of the following may be the cause of the problem:
The electronic key may not be functioning properly. (P. 550)
There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
There may be a malfunction in the immobilizer system. (P. 9 0 )
There may be a malfunction in the steering lock system.
The hybrid system may be malfunctioning due to an electrical problem
such as electronic key battery depletion or a blown fuse. However,
depending on the type of malfunction, an interim measure is available
to start the hybrid system. (P. 547)
One of the following may be the cause of the problem:
The 12-volt battery terminal connections may be loose or corroded.
The 12-volt battery may be discharged. (P. 551)
If the hybrid system will not start
Reasons for the hybrid system not starting vary depending on the situa-
tion. Check the following and perform the appropriate procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. (P. 209)
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.
Page 563 of 628
5498-2. Steps to take in an emergency
8
When trouble arises
IS300h_EE(OM53B95E)
Doors
Use the mechanical key (P.
131) in order to perform the fol-
lowing operations:
Locks all the doors
Closes the windows and moon
roof (turn and hold)
*
Unlocks all the doors
Opens the windows and moon roof (turn and hold)
*
*
: This setting must be customized at any authorized Lexus dealer or repairer,
or another duly qualified and equipped professional.
Trunk
Turn the mechanical key clock-
wise to open.
If the electronic key does not operate properly
If communication between the electronic key and vehicle is interrupted
(P. 151) or the electronic key cannot be used because the battery is
depleted, the smart entry & start system and wireless remote control can-
not be used. In such cases, the doors and trunk can be opened and the
hybrid system can be started by following the procedure below.
Locking and unlocking the doors, unlocking the trunk and key
linked functions
1
2
3
4
Page 564 of 628

5508-2. Steps to take in an emergency
IS300h_EE(OM53B95E)
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of
the electronic key to the power
switch.
When the electronic key is detected,
a buzzer sounds and the power
switch will turn to ON mode.
When the smart entry & start system
is deactivated in customization set-
ting, the power switch will turn to
ACCESSORY mode.
Firmly depress the brake pedal and check that is shown on the
multi-information display.
Press the power switch.
In the event that the hybrid system still cannot be started, contact any
authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
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 a temporary measure, it is recommended that the elec-
tronic key battery be replaced immediately when the battery is depleted. (P.
472)
Alarm (if equipped)
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechanical key when the alarm system is set, the
alarm may be triggered.
Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and modes will be changed each time the switch
is pressed. (P. 210)
When the electronic key does not work properly
Make sure that the smart entry & start system has not been deactivated in the
customization setting. If it is off, turn the function on.
(Customizable features P. 575)
Check if battery-saving mode is set. If it is set, cancel the function. (P. 150)
Starting the hybrid system
1
2
3
4
3
Page 567 of 628

5538-2. Steps to take in an emergency
8
When trouble arises
IS300h_EE(OM53B95E)
Once the hybrid system has started, remove the jumper cables in the
exact reverse order from which they were connected.
Once the hybrid system starts, have the vehicle inspected at any autho-
rized Lexus dealer or repairer, or another duly qualified and equipped
professional as soon as possible.
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.
Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gradually even when
the vehicle is not in use, due to natural discharge and the draining effects of cer-
tain electrical appliances. If the vehicle is left for a long time, the 12-volt battery
may discharge, and the hybrid system may be unable to start. (The 12-volt bat-
tery recharges automatically while the hybrid system is operating.)
When recharging or replacing the 12-volt battery
For vehicles with an alarm: Make sure that the key is not inside the vehicle
when recharging or replacing the 12-volt battery. The key may be locked in the
vehicle if the alarm is activated. (P. 98)
In some cases, it may not be possible to unlock the doors using the smart entry
& start system when the 12-volt battery is discharged. Use the wireless remote
control or the mechanical key to lock or unlock the doors.
The hybrid system may not start on the first attempt after the 12-volt battery has
recharged but will start normally after the second attempt. This is not a mal-
function.
The power switch mode is memorized by the vehicle. When the 12-volt battery
is reconnected, the system will return to the mode it was in before the 12-volt
battery was discharged. Before disconnecting the 12-volt battery, turn the
power switch off.
If you are unsure what mode the power switch was in before the 12-volt battery
discharged, be especially careful when reconnecting the 12-volt battery.
8
Page 594 of 628
579
9 9-2. Customization
Vehicle specifications
IS300h_EE(OM53B95E)
Door lock (P. 136, 143, 549)
Smart entry & start system and wireless remote control (P. 136, 143)
FunctionDefault set-
tingCustomized set-
ting
Unlocking using a
mechanical keyAll doors
unlocked in
one stepDriver's door
unlocked in one
step, all doors
unlocked in two
steps
———O
Speed-detecting auto-
matic door lock functionOnOffO—OO
Shifting gears to position
other than P locks all
doors
OffOnO—OO
Shifting gears to P
unlocks all doorsOffOnO—OO
Opening driver's door
unlocks all doorsOnOffO—OO
Locking/unlocking of the
trunk when all doors are
locked/unlockedOnOff———O
1234
FunctionDefault set-
tingCustomized set-
ting
Operation signal
(Emergency flashers)OnOffO—OO
Time elapsed before auto-
matic door lock function
is activated if door is not
opened after being
unlocked
30 seconds
60 seconds
O—OO120 seconds
Open door warning
buzzerOnOff———O
1234
Page 596 of 628
581
9 9-2. Customization
Vehicle specifications
IS300h_EE(OM53B95E)
Outside rear view mirrors (P. 180)
*: If equipped
Power windows (P. 184)
Moon roof* (P. 187)
*: If equipped
FunctionDefault set-
tingCustomized set-
ting
Automatic mirror folding
and extending operation
*
Linked to the
locking/
unlocking of
the doorsOff
———OLinked to opera-
tion of the power
switch
1234
FunctionDefault set-
tingCustomized set-
ting
Mechanical key linked
operationOffOn———O
Wireless remote control
linked operationOffOn———O
1234
FunctionDefault set-
tingCustomized set-
ting
Mechanical key linked
operationOffOn———O
Linked operation of com-
ponents when mechani-
cal key is used (open
only)
Slide onlyTilt only———O
Wireless remote control
linked operationOffOn———O
Linked operation of com-
ponents when wireless
remote control is used
(open only)
Slide onlyTilt only———O
1234