Page 91 of 628
90
IS300h_EE(OM53B95E)1-3. Theft deterrent system
The indicator light flashes after the
power switch has been turned off to
indicate that the system is operat-
ing.
The indicator light stops flashing
after the power switch has been
turned to ACCESSORY or ON
mode to indicate that the system has
been canceled.
System maintenance
The vehicle has a maintenance-free type immobilizer system.
Conditions that may cause the system to malfunction
If the grip portion of the key is in contact with a metallic object
If the key is in close proximity to or touching a key registered to the security
system (key with a built-in transponder chip) of another vehicle
Immobilizer system
The vehicle’s keys have built-in transponder chips that prevent the hybrid
system from starting if a key has not been previously registered in the
vehicle’s on-board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
Page 98 of 628
971-3. Theft deterrent system
1
For safety and security
IS300h_EE(OM53B95E)
Do one of the following to deactivate or stop the alarm:
Unlock the doors or open the trunk using the entry function or wireless
remote control.
Start the hybrid system. (The alarm will be deactivated or stopped after
a few seconds.)
System maintenance
The vehicle has a maintenance-free type alarm system.
Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft, make sure of the
following:
Nobody is in the vehicle.
The windows and moon roof (if equipped) are closed before the alarm is set.
No valuables or other personal items are left in the vehicle.
Deactivating or stopping the alarm
Page 115 of 628

1142. Instrument cluster
IS300h_EE(OM53B95E)
Hybrid System Indicator
Charge area
Shows regenerative charging.
Hybrid Eco area
Shows that gasoline engine power is not being used very often.
The gasoline engine will automatically stop and restart under various condi-
tions.
Eco area
Shows that the vehicle is being driven in an Eco-friendly manner.
Power area
Shows that an Eco-friendly driving range is being exceeded (during full power
driving etc.)
Hybrid System Indicator is displayed when the driving mode is other than sport
mode with the tachometer setting other than “Tachometer (Always)”.
By keeping the indicator needle (except F SPORT models) or bar display (F
SPORT models) within the Eco area, more Eco-friendly driving can be
achieved.
Charge area indicates regeneration* status. Regenerated energy will be used to
charge the hybrid battery (traction battery).
*: When used in this manual, regeneration refers to the conversion of energy cre-
ated by the movement of the vehicle into electrical energy.
Except F SPORT modelsF SPORT models
1
2
3
4
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1333-1. Key information
3
Operation of each component
IS300h_EE(OM53B95E)
When riding in an aircraft
When bringing an electronic key onto an aircraft, make sure you do not press any
buttons on the electronic key while inside the aircraft cabin. If you are carrying
an electronic key in your bag etc., ensure that the buttons are not likely to be
pressed accidentally. Pressing a button may cause the electronic key to emit radio
waves that could interfere with the operation of the aircraft.
Electronic key battery depletion
The standard battery life is 1 to 2 years. (The card key battery life is about a
year and a half.)
If the battery becomes low, an alarm will sound in the cabin when the hybrid
system is stopped. (P. 527)
As the electronic key always receives radio waves, the battery will become
depleted even if the electronic key is not used. The following symptoms indi-
cate that the electronic key battery may be depleted. Replace the battery when
necessary. (P. 472)
• The smart entry & start system or the wireless remote control does not oper-
ate.
• The detection area becomes smaller.
• The LED indicator on the key surface does not turn on.
To avoid serious deterioration, do not leave the electronic key within 1 m (3 ft.)
of the following electrical appliances that produce a magnetic field:
•TVs
• Personal computers
• Cellular phones, cordless phones and battery chargers
• Recharging cellular phones or cordless phones
• Table lamps
• Induction cookers
Replacing the battery
P. 472
Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask any
authorized Lexus dealer or repairer, or another duly qualified and equipped pro-
fessional for details.
If a wrong key is used
The key cylinder rotates freely to isolate inside mechanism.
Page 139 of 628

1373-2. Opening, closing and locking the doors and trunk
3
Operation of each component
IS300h_EE(OM53B95E)
Operation signals
The emergency flashers flash to indicate that the doors have been locked/
unlocked. (Locked: once; Unlocked: twice)
A buzzer sounds to indicate that the windows and moon roof are operating.
Security feature
If a door is not opened within approximately 30 seconds after the vehicle is
unlocked, the security feature automatically locks the vehicle again.
Welcome light illumination control
The front position, tail and license plate lights automatically turn on at night
when the doors are unlocked using the entry function or wireless remote control
if the light switch is in the “AUTO” position.
When the door cannot be locked by the lock sensor on the upper part of the door
handle (vehicles with entry function)
Door lock buzzer
If an attempt to lock the doors is made when a door is not fully closed, a buzzer
sounds continuously for 5 seconds. Fully close the door to stop the buzzer, and
lock the vehicle once more.
Setting the alarm (if equipped)
Locking the doors will set the alarm system. (P. 96)
If the smart entry & start system or the wireless remote control does not operate
properly
Use the mechanical key to lock and unlock the doors. (P. 548)
Replace the key battery with a new one if it is depleted. (P. 472) If the door will not lock even when the top-
side sensor area is touched, try touching
both the topside and underside sensor areas
at the same time.
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1503-2. Opening, closing and locking the doors and trunk
IS300h_EE(OM53B95E)
Battery-saving function (vehicles with entry function)
The battery-saving function will be activated in order to prevent the electronic
key battery and the 12-volt battery from being discharged while the vehicle is not
in operation for a long time.
In the following situations, the smart entry & start system may take some time
to unlock the doors.
• The electronic key has been left within approximately 2 m (6 ft.) of the out-
side of the vehicle for 10 minutes or longer.
• The smart entry & start system has not been used for 5 days or longer.
If the smart entry & start system has not been used for 14 days or longer, the
doors cannot be unlocked at any door except the driver’s door. In this case, hold
the driver’s door handle, or use the wireless remote control or mechanical key,
to unlock the doors.
Electronic Key battery-Saving Function
When battery-saving mode is set, battery depletion is minimized by stopping the
electronic key from receiving radio waves.
Press twice while pressing and hold-
ing . Confirm that the electronic key
indicator flashes 4 times.
While the battery-saving mode is set, the
smart entry & start system cannot be used.
To cancel the function, press any of the
electronic key buttons.
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1533-2. Opening, closing and locking the doors and trunk
3
Operation of each component
IS300h_EE(OM53B95E)
Note for the push-start function
Even when the electronic key is within the effective range (detection areas), the
system may not operate properly when the electronic key is on the instrument
panel, rear package tray or floor, or in the door pockets or glove box when the
hybrid system is started or power switch modes are changed.
Even if the electronic key is not inside the vehicle, it may be possible to start
the hybrid system if the electronic key is near the window.
When the vehicle is not driven for extended periods
Vehicles with entry function: To prevent theft of the vehicle, do not leave the
electronic key within 2 m (6 ft.) of the vehicle.
The smart entry & start system can be deactivated in advance. (P. 575)
To operate the system properly
Make sure to carry the electronic key when operating the system. Do not get the
electronic key too close to the vehicle when operating the system from the out-
side of the vehicle.
Depending on the position and holding condition of the electronic key, the key
may not be detected correctly and the system may not operate properly. (The
alarm may go off accidentally, or the door lock prevention function may not
operate.)
Do not leave the electronic key inside the luggage compartment.
The key confinement prevention function may not operate, depending on the
location of the key (close to a spare tire [if equipped], the inside edge of the lug-
gage compartment), conditions (inside a metal bag, close to metallic objects)
and the radio waves in the surrounding area. (P. 146)
If the smart entry & start system does not operate properly
Locking and unlocking the doors and opening the trunk: Use the mechanical
key.
(P. 548)
Starting the hybrid system: P. 5 4 9
Customization
Settings (e. g. smart entry & start system) can be changed.
(Customizable features: P. 575)
If the smart entry & start system has been deactivated in a customized setting
Locking and unlocking the doors and opening the trunk:
Use the wireless remote control or mechanical key. (P. 136, 144, 548)
Starting the hybrid system and changing power switch modes:P. 549
Stopping the hybrid system: P. 210
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1723-3. Adjusting the seats
IS300h_EE(OM53B95E)
When driving position memory is linked with door unlock operation
If the driver’s door is opened, the driver’s seat will move toward the memorized
position but stop slightly beforehand to allow easy access to the vehicle.
Turning the power switch to ACCESSORY or ON mode, or fastening the
driver’s seat belt moves the seat fully into the memorized position.
Operating the driving position memory after turning the power switch off
Memorized seat positions can be activated up to 180 seconds after the driver’s
door is opened and another 60 seconds after it is closed again. Memorized steer-
ing wheel position can be activated by pressing the power switch.
Correct seat position
When the seat is in the most forward or most backward position, and the seat is
being moved in those directions, the system may not correctly recognize the cur-
rent position and the memorized position will not be correctly recalled.
The auto away function for exiting
If the seat is already close to the rearmost position, the auto away function may
not operate when the driver exits the vehicle.
When the driving position is recalled by a memory linked door unlock operation
Since each memorized driving position is registered to a specific electronic key,
the driving position recalled may be different depending on the carried key.
When only doors other than the driver’s door are unlocked by the smart entry &
start system, the driving position will not be recalled. In this case, press a driv-
ing position memory button to recall the desired driving position.
Customization
The distance that the driver’s seat moves backward during the auto away func-
tion can be changed. (Customizable features: P. 575)
CAUTION
Seat adjustment caution
Take care during seat adjustment so that the seat does not strike the rear passen-
ger or squeeze your body against the steering wheel.