Page 566 of 628
5668-2. Steps to take in an emergency
IS300h_EE(OM53D56E)
If you have a set of jumper (or booster) cables and a second vehicle with a 12-volt
battery, you can jump start your vehicle by following the steps below.Confirm that the electronic key is
being carried.
When connecting the jumper (or
booster) cables, depending on the situa-
tion, the alarm may activate and doors
locked. (
→P. 9 8 )
Open the hood ( →P. 4 5 3 ) a n d f u s e
box cover.
Remove the clips.
Push the tabs on either side to
detach the lock and lift the lid off
while pulling the lock plate.
If the 12-volt battery is discharged
The following procedures may be used to start the hybrid system if the 12-volt
battery is discharged.
You can also call any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional.
1
2
1
2
Page 568 of 628

5688-2. Steps to take in an emergency
IS300h_EE(OM53D56E)
Maintain the engine speed of the second vehicle and start the hybrid system
of your vehicle by turning the power switch to ON mode.
Make sure the “READY” indicator comes on. If the indicator does not come
on, contact any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.
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 authorized
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 certain electrical appli-
ances. 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 battery recharges automatically while
the hybrid system is operating.)
■When recharging or replacing the 12-volt battery
●In some cases, it may not be possible to un lock 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 malfunction.
●The power switch mode is memorized by the vehicle. When the 12-volt battery is
reconnected, the system will return to the mo de 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 dis-
charged, be especially careful when reconnecting the 12-volt battery.
7
8
9
Page 594 of 628
5949-2. Customization
IS300h_EE(OM53D56E)
■Door lock ( →P. 136, 143, 563)
■Smart entry & start system and wireless remote control ( →P. 136, 143)
FunctionDefault settingCustomized setting
Unlocking using a mechani-
cal keyAll doors
unlocked in one stepDriver's door
unlocked in one step, all doors unlocked in
two steps
——O
Speed-detecting automatic
door lock functionOnOffO—O
Shifting gears to position
other than P locks all doorsOffOnO—O
Shifting gears to P unlocks all
doorsOffOnO—O
Opening driver's door
unlocks all doorsOnOffO—O
Locking/unlocking of the
trunk when all doors are
locked/unlockedOnOff——O
123
FunctionDefault settingCustomized setting
Operation signal
(Emergency flashers)OnOffO—O
Ti m e e l a p s e d b e f o r e a u t o -
matic door lock function is
activated if door is not
opened after being unlocked
30 seconds
60 seconds
——O120 seconds
Open door warning buzzerOnOff——O
Welcome light illumination
controlOnOff——O
123
Page 595 of 628
595
9
9-2. Customization
Vehicle specifications
IS300h_EE(OM53D56E)
■Smart entry & start system (
→P. 136, 143, 149)
*: If equipped
■Wireless remote control ( →P. 136, 143)
■Driving position memory* (→ P. 1 6 9 )
*: If equipped
FunctionDefault settingCustomized setting
Smart entry & start systemOnOffO—O
Smart door unlocking*All the doorsDriver's doorO—O
Number of consecutive door
lock operations*As many as
desired2 times——O
123
FunctionDefault settingCustomized setting
Wireless remote controlOnOff——O
Unlocking operationAll doors
unlocked in one stepDriver's door
unlocked in one step,
all doors unlocked in two steps
O—O
Trunk unlocking operationPress and hold
(short)
One short press
——OPush twice
Press and hold (long)
Off
123
FunctionDefault settingCustomized setting
Driver's seat movement
when exiting the vehicleStandardOffO—OPa r t i a l
Doors linked to the driving
position memory recall func-
tionDriver's doorAll doors——O
123
Page 596 of 628
5969-2. Customization
IS300h_EE(OM53D56E)
■Outside rear view mirrors ( →P. 1 8 1 )
*: If equipped
■Powe r w i n d ows ( →P. 185)
■Moon roof* (→ P. 1 8 9 )
*: If equipped
FunctionDefault settingCustomized setting
Automatic mirror folding and
extending operation*
Linked to the
locking/unlock-
ing of the doorsOff
——OLinked to operation of the power switch
123
FunctionDefault settingCustomized setting
Mechanical key linked oper-
ationOffOn——O
Wireless remote control
linked operationOffOn——O
Wireless remote control
linked operation signal
(buzzer)OnOff——O
123
FunctionDefault settingCustomized setting
Mechanical key linked oper-
ationOffOn——O
Linked operation of compo-
nents when mechanical key is
used (open only)Slide onlyTilt only——O
Wireless remote control
linked operationOffOn——O
Linked operation of compo-
nents when wireless remote
control is used (open only)Slide onlyTilt only——O
Wireless remote control
linked operation signal
(buzzer)
OnOff——O
123
Page 599 of 628
599
9
9-2. Customization
Vehicle specifications
IS300h_EE(OM53D56E)
■Illumination (
→P. 425)
FunctionDefault settingCustomized setting
Time elapsed before the inte-
rior lights turn off15 seconds
Off
O—O7. 5 s e c o n d s
30 seconds
Operation after the power
switch is turned offOnOff——O
Operation when the doors
are unlockedOnOff——O
Operation when you
approach the vehicle with the
electronic key on your per-
son
OnOff——O
Inside door handle lightsOnOff——O
Ti m e e l a p s e d b e f o r e t h e
outer foot lights turn off15 seconds
Off
O—O7. 5 s e c o n d s
30 seconds
Operation of the outer foot
lights when you approach the
vehicle with the electronic
key on your person
OnOff——O
Operation of the outer foot
lights when the doors are
unlocked with the power
door lock switch
OnOff——O
123
Page 600 of 628

6009-2. Customization
IS300h_EE(OM53D56E)
■Vehicle customization
●When the speed-detecting automatic door lock and shift-linked automatic door lock
are both on, the door lock operates as follows.
• When shifting the shift lever to any position other than P, all the doors will be locked.
• If the vehicle is started with all doors locked, the speed-detecting automatic door lock will not operate.
• If the vehicle is started with any door unlocked, the speed-detecting automatic door
lock will operate.
●When the smart entry & start system is off, the entry unlock function cannot be custom-
ized.
●When the doors remain closed after unlocking the doors and the timer activated auto-
matic door lock function activates, signal s will be generated in accordance with the
operation buzzer volume and operational signal (Emergency flashers) function set-
tings.
●Some settings can be changed using a switch or the audio system screen. If a setting is
changed using a switch, the ch anged setting will not be reflected on the audio system
screen until the power switch is turned off and then to ON mode.
■When customizing using the Remote Touch or Lexus Display Audio controller (if
equipped)
Stop the vehicle in a safe place, apply the parking brake, and shift the shift lever to P. Also,
to prevent 12-volt battery discharge, leave the hybrid system operating while customiz-
ing the features.
CAUTION
■During customization
As the hybrid system needs to be operating during customization, ensure that the vehi-
cle is parked in a place with adequate ventilation. In a closed area such as a garage,
exhaust gases including harmful carbon monoxide (CO) may collect and enter the
vehicle. This may lead to death or a serious health hazard.
NOTICE
■During customization
To prevent 12-volt battery discharge, ensure that the hybrid system is operating while
customizing features.
Page 604 of 628

604
IS300h_EE(OM53D56E)What to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be made
by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional. (
→P. 1 3 2 )
●If you lose your electronic keys, the risk of vehicle theft increases significantly.
Contact any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional immediately. ( →P. 1 3 5 )
●Is the electronic key battery weak or depleted? ( →P. 4 8 8 )
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. ( →P. 2 1 3 )
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on your
person.
●The function may not operate properly due to the condition of the radio wave.
(→ P. 151)
●Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the lock is set.
Open the rear door from outside and then unlock the child-protector lock.
( → P. 1 4 0 )
If you have a problem, check the foll owing before contacting any authorized
Lexus dealer or repairer, or another duly qualified and equipped professional.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened