Page 484 of 588

4848-2. Steps to take in an emergency
IS250_EE(OM53C51E)
Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning
A buzzer also sounds.
→Immediately stop the vehicle in a safe place and
contact any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
Continuing to drive the vehicle may be dangerous.
Indicates that one or more of the doors is not fully closed
The system also indicates which doors are not fully
closed.
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the door(s) are not yet fully closed.
→Make sure that all the doors are closed.
Indicates that the hood is not fully closed
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the hood is not yet fully closed.
→Close the hood.
Indicates that the trunk is not fully closed
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the trunk is not yet fully closed.
→Close the trunk.
(If equipped)
Indicates a malfunction in the Lexus parking assist-sen-
sor
The assist-sensors flash.
A buzzer also sounds.
→Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
(If equipped)
Indicates that a Lexus parking assist-sensor is dirty or
covered with ice
A buzzer also sounds.
→Clean the sensor.
Wa r n i n g m e s s a g eDetails/Actions
Page 500 of 588
5008-2. Steps to take in an emergency
IS250_EE(OM53C51E)
Loosen the center fastener that
secures the spare tire.
If the center fastener cannot be turned
by hand, use the wheel nut wrench that
is stored in the trunk. (To secure the tire,
tighten the center fastener by hand. Do
not use the wrench or other tools.)
Chock the tires.
3
CAUTION
■When storing the spare tire
Be careful not to catch fingers or other body parts between the spare tire and the body
of the vehicle.
Replacing a flat tire
1
Flat tireWheel chock positions
FrontLeft-hand sideBehind the rear right-hand side tire
Right-hand sideBehind the rear left-hand side tire
RearLeft-hand sideIn front of the front right-hand side tire
Right-hand sideIn front of the front left-hand side tire
Page 524 of 588
5248-2. Steps to take in an emergency
IS250_EE(OM53C51E)
■Doors
Use the mechanical key (→P. 113) in
order to perform the following oper-
ations:
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.
■Tr u n k
Turn the mechanical key clockwise
to open.
If the electronic key does not operate properly
If communication between the electronic key and vehicle is interrupted (→P.
132) or the electronic key cannot be used because the battery is depleted,
the smart entry & start system and wireless remote control cannot be used. In
such cases, the doors and trunk can be opened and the engine 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 548 of 588
5489-1. Specifications
IS250_EE(OM53C51E)
Light bulbs*1
Light bulbsWTy p e
Exterior
Discharge headlights*235A
Front turn signal lights21B
Rear turn signal lights21B
Back-up lights16C
Outer foot lights5C
Interior
Door courtesy lights5C
Vanity lights8C
Interior light8C
Personal lights8C
Footwell lights3.8C
Trunk light5C
A: D4S discharge bulbs
B: Wedge base bulbs (amber)
C: Wedge base bulbs (clear)
*1: Light bulbs not listed in this table are LED bulbs.
*2: If equipped
Page 554 of 588
5549-2. Customization
IS250_EE(OM53C51E)
■Door lock (→P. 118, 125, 524)
■Smart entry & start system and wireless remote control (→P. 118, 125)
FunctionDefault settingCustomized setting
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 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/
unlocked
OnOff——O
123
FunctionDefault settingCustomized setting
Operation signal
(Emergency flashers)OnOffO—O
Time elapsed before automatic
door lock function is activated if
door is not opened after being
unlocked
30 seconds
60 seconds
——O120 seconds
Open door warning buzzerOnOff——O
123
Page 555 of 588
555
9 9-2. Customization
Vehicle specifications
IS250_EE(OM53C51E)
■Smart entry & start system (→P. 118, 125, 130)
*: If equipped
■Wireless remote control (→P. 118, 125)
■Driving position memory* (→P. 1 5 1 )
*: 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 operation
All 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
——O
Push 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 posi-
tion memory recall functionDriver's doorAll doors——O
123
Page 565 of 588

565What to do if... (Troubleshooting)
IS250_EE(OM53C51E)
●The function to prevent the electronic key from being left inside the trunk will
operate and you can open the trunk as usual. Take the key out from the trunk.
(→P. 1 2 7 )
●Did you press the engine switch while firmly depressing the brake pedal?
(→P. 1 9 2 )
●Is the shift lever in P? (→P. 1 9 4 )
●Is the electronic key anywhere detectable inside the vehicle? (→P. 1 3 0 )
●Is the steering wheel unlocked? (→P. 1 9 4 )
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a temporary way. (→P. 5 2 5 )
●Is the battery discharged? (→P. 5 2 7 )
●Is the engine switch in IGNITION ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
engine switch in IGNITION ON mode. (→P. 5 2 3 )
●It is locked automatically to prevent theft of the vehicle. (→P. 1 9 4 ) The trunk lid is closed with the electronic key left inside
If you think something is wrong
The engine does not start
The shift lever cannot be shifted from P even if you depress the brake
pedal
The steering wheel cannot be turned after the engine is stopped
Page 570 of 588

570Alphabetical index
IS250_EE(OM53C51E)
Card key...................................................... 112
Care ............................................... 404, 408
Aluminum wheels ............................. 405
Exterior....................................................404
Interior .................................................... 408
Seat belts............................................... 409
Cargo hooks ...........................................395
CD player ................................................. 319
Chains .......................................................289
Child restraint system ............................58
Baby seats, definition .......................... 59
Baby seats, installation .......................68
Child seats, definition.......................... 59
Child seats, installation.......................68
Installing CRS with ISOFIX
rigid anchors.......................................... 71
Installing CRS with seat belts..........68
Installing CRS with top strap ...........72
Junior seats, definition ........................ 59
Junior seats, installation ..................... 70
Child safety................................................. 57
Airbag precautions .............................. 43
Battery precautions ............. 425, 530
Child restraint system.........................58
How your child should
wear the seat belt .............................. 38
Installing child restraints .................... 67Moon roof precautions .................... 173
Power window lock switch ............ 167
Power window precautions........... 169
Rear door child-protectors ............ 122
Removed electronic key
battery precautions....................... 444
Seat belt precautions.......................... 40
Seat heater precautions ................. 387
Trunk precautions .............................. 128
Child-protectors .................................... 122
Cleaning....................................... 404, 408
Aluminum wheels.............................. 405
Exterior ................................................... 404
Interior.....................................................408
Seat belts ............................................... 409
Clock ......................................................... 398
Coat hooks.............................................. 402
Condenser ............................................. 422
Console box ........................................... 392
Cooling system ....................................... 421
Engine overheating ............................ 531
Cruise control
Cruise control ......................................225
Dynamic radar cruise control ......229
Cup holders ............................................ 393
Current fuel consumption ................... 101
Curtain shield airbags ............................ 41
Customizable features....................... 552
C