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601-1. For safe use
IS300h_EE(OM53B95E)
It is recommended that children sit in the rear seats to avoid accidental
contact with the shift lever, wiper switch etc.
Use the rear door child-protector lock or the window lock switch to
avoid children opening the door while driving or operating the power
window accidentally.
Do not let small children operate equipment which may catch or pinch
body parts, such as the power window, hood, trunk, seats etc.
Safety information for children
Observe the following precautions when children are in the vehicle.
Use a child restraint system appropriate for the child, until the child
becomes large enough to properly wear the vehicle’s seat belt.
CAUTION
Never leave children unattended in the vehicle, and never allow children to
have or use the key.
Children may be able to start the vehicle or shift the vehicle into neutral. There
is also a danger that children may injure themselves by playing with the win-
dows, the moon roof or other features of the vehicle. In addition, heat build-up
or extremely cold temperatures inside the vehicle can be fatal to children.
Page 81 of 628
801-2. Hybrid system
IS300h_EE(OM53B95E)
When stopped/during start off
The gasoline engine stops when the vehicle is stopped. During start off,
the electric motor (traction motor) drives the vehicle. At slow speeds or
when traveling down a gentle slope, the engine is stopped and the elec-
tric motor (traction motor) is used.
During normal driving
The gasoline engine is predominantly used. The electric motor (trac-
tion motor) charges the hybrid battery (traction battery) as necessary.
When accelerating sharply
When the accelerator pedal is depressed heavily, the power of the
hybrid battery (traction battery) is added to that of the gasoline engine
via the electric motor (traction motor).
When braking (regenerative braking)
The electric motor (traction motor) charges the hybrid battery (traction
battery).
Page 84 of 628
831-2. Hybrid system
1
For safety and security
IS300h_EE(OM53B95E)
Hybrid system precautions
Take care when handling the hybrid system, as it is a high voltage system
(about 650 V at maximum) as well as contains parts that become
extremely hot when the hybrid system is operating. Obey the caution
labels attached to the vehicle.
Caution label
Power control unit
Electric motor (traction motor)
Hybrid battery (traction battery)Service plug
High voltage cables (orange)
Air conditioning compressor1
2
3
4
5
6
7
Page 86 of 628

851-2. Hybrid system
1
For safety and security
IS300h_EE(OM53B95E)
If a warning light comes on, a warning message is displayed, or the 12-volt bat-
tery is disconnected
The hybrid system may not start. In this case, try to start the system again. If the
“READY” indicator does not come on, contact any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
Running out of fuel
When the vehicle has run out of fuel and the hybrid system cannot be started,
refuel the vehicle with at least enough gasoline to make the low fuel level warn-
ing light (P. 509) go off. If there is only a small amount of fuel, the hybrid sys-
tem may not be able to start. (The minimum amount of fuel to add to make the
low fuel level warning light go out is about 10 L [2.7 gal., 2.2 Imp. gal.], when
the vehicle is on a level surface. This value may vary when the vehicle is on a
slope.)
Electromagnetic waves
High voltage parts and cables on hybrid vehicles incorporate electromagnetic
shielding, and therefore emit approximately the same amount of electromag-
netic waves as conventional gasoline powered vehicles or home electronic
appliances.
Your vehicle may cause sound interference in some third party-produced radio
parts.
Hybrid battery (traction battery)
The hybrid battery (traction battery) has a limited service life. The lifespan of the
hybrid battery (traction battery) can change in accordance with driving style and
driving conditions.
Declaration of conformity
This model conforms to hydrogen emissions according to regulation ECE100
(Battery electric vehicle safety).
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 96 of 628
951-3. Theft deterrent system
1
For safety and security
IS300h_EE(OM53B95E)
Vehicles employing this system
have labels on the window glass of
both front doors.
Turn the power switch off, have all the passengers exit the vehicle and
ensure that all the doors are closed.
Using the entry function:
Touch the sensor area on the outside door handle twice within 5 seconds.
Using the wireless remote control:
Press twice within 5 seconds.
Using the entry function: Hold the outside door handle.
Using the wireless remote control: Press .
Double locking system
Unauthorized access to the vehicle is prevented by disabling the door
unlocking function from both the interior and exterior of the vehicle.
Setting the double locking system
Canceling the double locking system
CAUTION
Double locking system precaution
Never activate the double locking system when there are people in the vehicle
because all the doors cannot be opened from inside the vehicle.
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991-3. Theft deterrent system
1
For safety and security
IS300h_EE(OM53B95E)
The intrusion sensor detects intruders or movement in the vehicle.
The tilt sensor detects changes in vehicle inclination, such as when the
vehicle is towed away.
This system is designed to deter and prevent vehicle theft but does not
guarantee absolute security against all intrusions.
Setting the intrusion sensor and tilt sensor
The intrusion sensor and tilt sensor will be set automatically when the
alarm is set. (P. 9 6 )
Canceling the intrusion sensor and tilt sensor
If you are leaving pets or other moving things inside the vehicle, make
sure to disable the intrusion sensor and tilt sensor before setting the
alarm, as they will respond to movement inside the vehicle.
Turn the power switch off.
Press the intrusion sensor and
tilt sensor cancel switch.
Press the switch again to re-
enable the intrusion sensor and
tilt sensor.
Each time the intrusion sensor is
canceled/set, a message will be
shown on the multi-information
display in the instrument cluster.
Intrusion sensor and tilt sensor (if equipped)
1
2
Page 101 of 628

1001-3. Theft deterrent system
IS300h_EE(OM53B95E)
Canceling and automatic re-enabling of the intrusion sensor and tilt sensor
The alarm will still be set even when the intrusion sensor and tilt sensor are can-
celed.
After the intrusion sensor and tilt sensor are canceled, pressing the power
switch or unlocking the doors using the entry function or wireless remote con-
trol will re-enable the intrusion sensor and tilt sensor.
The intrusion sensor and tilt sensor will automatically be re-enabled when the
alarm system is deactivated.
Intrusion sensor detection considerations
The sensor may trigger the alarm in the following situations:
Places with extreme vibrations or noises, or situations in which the vehicle is
subject to repeated impacts or vibrations:
• When parked in a parking garage
• When the vehicle is transported on a ferry, trailer, train, etc.
• When ice adhering to the vehicle is removed
• When the vehicle is in an automatic or high-pressure car wash
• When in a hail or lightning storm
A window or the moon roof is open.
In this case, the sensor may detect the fol-
lowing:
• Wind or the movement of objects such
as leaves and insects inside the vehicle
• Ultrasonic waves emitted from devices
such as the intrusion sensors of other
vehicles
• The movement of people outside the
vehicle
Unstable items, such as dangling accesso-
ries or clothes hanging on the coat hooks,
are in the vehicle.