2017 Lexus IS300h change key battery

1543-2. Opening, closing and locking the doors and trunk
IS300h_EE(OM53D89E)
■Trunk light (if equipped)
The trunk light turns on when the trunk is opened.
■Function to prevent the trunk being lo cked with the electronic key inside
●When all doors are locked, closing the trunk lid with the electronic key left inside the
trunk will sound an alarm.
In this case, the trunk lid can be opened pressing the trunk release button on the trunk lid.
●If the spare electronic key is put in the trunk with all the doors locked, the key confine-
ment prevention function is activated so the trunk can be opened. In order to prevent theft, take all electronic keys with you when leaving the vehicle.
●If the electronic key is put in the trunk with all the doors locked, the key may not be
detected depending on the location of the key and the surrounding radio wave condi- tions. In this case, the key confinement prev ention function cannot be activated, causing
the doors to lock when the trunk is closed. Make sure to check where the key is before
closing the trunk.
●The key confinement prevention function cannot be activated if any one of the doors is
unlocked. In this case, open the trunk using the trunk opener.
■Using the mechanical key
The trunk can be also opened using the mechanical key. ( P. 628)
■If the smart entry & start system or the wireless remote control does not operate prop-
erly
Use the mechanical key to unlock the trunk. ( P. 628)
Replace the key battery with a new one if it is depleted. (P. 549)
■When leaving a key to the vehicle with a parking attendant
 P. 140
■Customization
The trunk unlocking operation can be changed. (Customizable features: P. 657)

1953-5. Opening, closing the windows and moon roof
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Operation of each component
IS300h_EE(OM53D89E)
■Door lock linked window operation
●The power windows can be opened and closed using the mechanical key.* ( P. 628)
●The power windows can be opened and closed using the wireless remote control.*
(P. 144)
*: These settings must be customized at any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
■When the 12-volt battery is disconnected
The window lock switch is disabled. If nece ssary, press the window lock switch after
reconnecting the 12-volt battery.
■Power windows open warning buzzer
The buzzer sounds and a message is shown on the multi-information display in the instru-
ment cluster when the power switch is turned off and the driver’s door is opened with the power windows open.
■Customization
Settings (e.g. linked door lock operation) can be changed. (Customizable features: P. 657)

2224-2. Driving procedures
IS300h_EE(OM53D89E)
■Steering lock
After turning the power switch off and openin g and closing the doors, the steering wheel will be locked due to the steering lock func tion. Operating the power switch again auto-
matically cancels the steering lock.
■When the steering lock cannot be released
■Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, operation of the motor may be sus-
pended if the hybrid system is turned on an d off repeatedly in a short period of time. In this case, refrain from operating the hybrid system. After about 10 seconds, the steering
lock motor will resume functioning.
■When “Smart Entry & Start System Malfunction See Owner's Manual” is displayed on the multi-information display
The system may be malfunctioning. Have the vehicle inspected by any authorized Lexus
retailer or Lexus authoriz ed repairer, or any reliable repairer immediately.
■If the “READY” indicator does not come on
In the event that the “READY” indicator does not come on even after performing the
proper procedures for starting the vehicle, contact any authorized Lexus retailer or
Lexus authorized repairer, or any reliable repairer immediately.
■If the hybrid system is malfunctioning
 P. 585
■If the electronic key battery is depleted
 P. 549
■Operation of the power switch
●If the switch is not pressed shortly and firmly, the power switch mode may not change or the hybrid system may not start.
●If attempting to restart the hybrid system immediately after turning the power switch off,
the hybrid system may not start in some cases. After turning the power switch off, please wait a few seconds before restarting the hybrid system.
■If the smart entry & start system has been deactivated by a customized setting
 P. 628
“Steering Wheel Lock Pr ess Power Switch while
Turning Wheel” will be displayed on the multi- information display.
Check that the shift lever is in P. Press the power
switch while turning the steering wheel left and right.

4836-3. Using the interior lights
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Interior features
IS300h_EE(OM53D89E)
■The interior lights and personal lights can be operated when
The interior lights and person al lights can be used regardless of the power switch mode.
However, when the power switch is turned off, they can be used only when the 12-volt battery protection function is not operating.
■12-volt battery protection function
To prevent the 12-volt battery from being discharged, approximately 20 minutes after the power switch is turned off, the power supp lied to the interior lights, personal lights,
and other lights will be cut off au tomatically. (If the interior lights, etc. are left on when the
power switch is turned off, they will be turned off automatically.)
To turn the interior lights, etc. back on , turn the power switch to ACCESSORY or ON
mode or operate the interior light swit ch until the interior lights turn on.
If any of the lights are illumina ted automatically due to the illuminated entry system, the 12-volt battery protection function will be canceled.
■Illuminated entry system
The lights automatically turn on/off according to power switch mode, the presence of the electronic key, whether the doors are locked/unlocked, and whether the doors are
opened/closed.
■Customization
Setting (e.g. the time elapsed before lights turn off) can be changed.
(Customizable features: P. 657)
NOTICE
To prevent 12-volt battery discharge, do not leave the lights on longer than necessary when the hybrid system is off.

6308-2. Steps to take in an emergency
IS300h_EE(OM53D89E)
■Stopping the hybrid system
Shift the shift lever to P and pr ess 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 electronic
key battery be replaced immediately when the battery is depleted. (P. 549)
■Alarm (if equipped)
Using the mechanical key to lock th e 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. 220)
■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. 657)
●Check if battery-saving mode is set. If it is set, cancel the function. (P. 158)
WARNING
■When using the mechanical key and operating the power windows or moon roof
Operate the power window or moon roof after checking to make sure that there is no possibility of any passenger having any of their body parts caught in the window or
moon roof.
Also, do not allow children to op erate the mechanical key. It is possible for children and other passengers to get caught in the power window or moon roof.
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