heating Lexus IS250 2014 Do-it-yourself service precautions / LEXUS 2014 IS250,IS350 OWNERS MANUAL (OM53758U)

852. Instrument cluster
2
Instrument cluster
IS350/250_U (OM53758U)
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator needle of the tachometer enter the red zone, which indicates
the maximum engine speed.
●The engine may be overheating if the engine coolant temperature gauge is in the red
zone (H). In this case, immediately stop the vehicle in a safe place, and check the
engine after it has cooled completely. (P. 4 9 4 )

1514-1. Before driving
4
Driving
IS350/250_U (OM53758U)
CAUTION
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When taking a nap in the vehicle
Always turn the engine off. Otherwise, if you accidentally move the shift lever or
depress the accelerator pedal, this could cause an accident or fire due to engine over-
heating. Additionally, if the vehicle is parked in a poorly ventilated area, exhaust gases
may collect and enter the vehicle, leadin g to death or a serious health hazard.
■When braking
●When the brakes are wet, drive more cautiously.
Braking distance increases when the brakes are wet, and this may cause one side of
the vehicle to brake differently than the other side. Also, the parking brake may not
securely hold the vehicle.
●If the power brake assist function does not operate, do not follow other vehicles
closely and avoid hills or sharp turns that require braking.
In this case, braking is st ill possible, but the brake pedal should be depressed more
firmly than usual. Also, the braking distan ce will increase. Have your brakes fixed
immediately.
●Do not pump the brake pedal if the engine stalls.
Each push on the brake pedal uses up the reserve for the power-assisted brakes.
●The brake system consists of 2 individual hy draulic systems; if one of the systems fails,
the other will still operate. In this case, the brake pedal should be depressed more
firmly than usual and the bra king distance will increase.
Have your brakes fixed immediately.
■If the vehicle becomes stuck
Do not spin the wheels excessively when any of the tires is up in the air, or the vehicle is
stuck in sand, mud, etc. This may damage th e driveline components or propel the vehi-
cle forward or backward, causing an accident.

1614-2. Driving procedures
4
Driving
IS350/250_U (OM53758U)
■Auto power off function
If the vehicle is left in ACCESSORY mode for more than 20 minutes or IGNITION ON
mode (the engine is not running) for more than an hour with the shift lever in P, the engine
switch will automatically turn off. However, this function cannot entirely prevent battery
discharge. Do not leave the vehicle with the engine switch in ACCESSORY or IGNI-
TION ON mode for long periods of ti me when the engine is not running.
■Electronic key battery depletion
P. 1 0 1
■Conditions affe cting operation
 P. 116
■Notes for the entry function
P. 117
■If the engine does not start
●Check that the shift lever is securely set in P. The engine may not start if the shift lever is
displaced out of P.
●The engine immobilizer system may not have been deactivated. ( P. 6 9 )
Contact your Lexus dealer.
■Steering lock
After turning the engine switch off and opening and closing the doors, the steering wheel
will be locked due to the stee ring lock function. Operating the engine 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 over heating, operation of the motor may be sus-
pended if the engine is turned on and off repeat edly in a short period of time. In this case,
refrain from operating the engine switch. After about 10 seconds, the steering lock
motor will resume functioning. “Steering Lock active” will be displayed on the
multi-information display.
Check that the shift lever is in P. Press the
engine switch while turning the steering wheel
left and right.

2334-5. Using the driving support systems
4
Driving
IS350/250_U (OM53758U)
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the air condi-
tioning system to enhance fuel efficiency ( P. 346). To improve air conditioning perfor-
mance, adjust the fan speed or turn off Eco drive mode.
■Sport mode automatic deactivation
Sport mode is automatically deactivated if the engine switch is turned off after driving in
sport mode.

2384-5. Using the driving support systems
IS350/250_U (OM53758U)
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from overheating
when there is frequent steering input over an extended period of time. The steering
wheel may feel heavy as a result. Should this occur, refrain from excessive steering input
or stop the vehicle and turn the engine of f. The EPS system should return to normal
within 10 minutes.
■Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assist control will operate:
●The shift lever is in a position other than P or N (when starting off forward/backward on
an upward incline).
●The vehicle is stopped.
●The accelerator pedal is not depressed.
●The parking brake is not engaged.
■Automatic system cancelation of hill-start assist control
The hill-start assist control will turn off in any of the following situations:
●The shift lever is moved to P or N.
●The accelerator pedal is depressed.
●The parking brake is engaged.
●Approximately 2 seconds elapse after the brake pedal is released.

3526-1. Using the air conditioning system
IS350/250_U (OM53758U)
■Using automatic mode
Fan speed is adjusted automatically accordin g to the temperature setting and the ambi-
ent conditions.
Therefore, the fan may stop for a while until warm or cool air is ready to flow immediately
after is pressed or “AUTO” is selected.
■Using the voice command system (veh icles with a navigation system)
Air conditioning system can be operated usin g voice commands. For details, refer to the
“Navigation System Owner’s Manual”.
■Fogging up of the windows
The windows will easily fog up when the humidity in the vehicle is high. Turning
(“A/C”) on will dehumidify the air from the outlets and defog the windshield effectively.
●If you turn (“A/C”) off, the windows may fog up more easily.
●The windows may fog up if the recirculated air mode is used.
■Outside/recirculated air mode
●When driving on dusty roads such as tunnels or in heavy traffic, set the outside/recircu-
lated air mode button to the recirculated ai r mode. This is effective in preventing out-
side air from entering the vehicle interior. During cooling operation, setting the
recirculated air mode will also cool the vehicle interior effectively.
●Outside/recirculated air mode may automati cally switch depending on the tempera-
ture setting or the inside temperature.
■When the outside temperature exceeds 75 F (24 C) and the air conditioning system
is on
●In order to reduce the air conditioning po wer consumption, the air conditioning system
may switch to recirculated air mode automa tically. This may also reduce fuel consump-
tion.
●Recirculated air mode is selected as a default mode when the engine switch is turned to
IGNITION ON mode.
●It is possible to switch to outside air mode at any time by pressing .
■Operation of the air conditioning system in Eco drive mode
In Eco drive mode, the air conditioning system is controlled as follows to prioritize fuel
efficiency:
●Engine speed and compressor operation controlled to restrict heating/cooling capac-
ity
●Fan speed restricted when automatic mode is selected
To improve air conditioning performance, perform the following operations:
●Adjust the fan speed
●Turn off Eco drive mode

3546-1. Using the air conditioning system
IS350/250_U (OM53758U)
Turn the heated steering wheel on/off
The indicator light comes on when the
heated steering wheel is operating.
Heated steering wheel/seat heaters/seat ventila-
tors


: If equipped
Heated steering wheel and seat heaters heat the side grips of the steering
wheel and seats, respectively. Seat ventilators maintain good airflow by blow-
ing air from the seats.
CAUTION
●Care should be taken to prevent injury if anyone in the following categories comes in
contact with the steering wheel or seats when the heater is on:
• Babies, small children, the elderly, the sick and the physically challenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (s leeping drugs, cold
remedies, etc.)
●Observe the following precautions to prevent the minor burns or overheating
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use seat heater more than necessary.
NOTICE
●Do not put heavy objects that have an uneven surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat.
●To prevent battery discharge, do not use the functions when the engine is off.
Heated steering wheel

4948-2. Steps to take in an emergency
IS350/250_U (OM53758U)
●The needle of the engine coolant temperature gauge (P. 81) enters the red
zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.)
●Steam comes out from under the hood.
Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down
sufficiently, inspect the hoses and
radiator core (radiator) for any
leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

555Alphabetical index
IS350/250_U (OM53758U)
Child safety ................................................ 53Airbag precautions .............................. 39
Battery precautions ............. 409, 493
Child restraint system ......................... 54
How your child should wear the seat belt .......................................... 32
Installing child restraints.................... 58
Moon roof precautions.................... 143
Power window lock switch .............137
Power window precautions .......... 139
Rear door child-protectors ........... 106
Removed electronic key battery precautions...............428
Seat belt extender precautions ........................................... 35
Seat belt precautions .......................... 57
Seat heater precautions..................354
Trunk precautions................................. 112
Child-protectors.................................... 106 Cleaning .......................................384, 387
Aluminum wheels ..............................384
Exterior ...................................................384
Interior ..................................................... 387
Seat belts............................................... 388
Clock......................................................... 365
Coat hooks ............................................. 369
Compass ..................................................375
Condenser.............................................. 406
Console box ........................................... 359
Cooling system ..................................... 405 Engine overheating .......................... 494
Cruise control Cruise control ....................................... 192
Dynamic radar cruise control .......196
Cup holders............................................ 360
Current fuel consumption ....................87
Curtain shield airbags ............................ 37
Customizable features ...................... 525

558Alphabetical index
IS350/250_U (OM53758U)
Emergency flashers ............................. 446
Engine ....................................................... 502Accessory mode................................. 160
Compartment....................................... 401
Engine switch ........................................ 159
Hood ....................................................... 399
How to start the engine ................... 159
Identification number ........................ 501
If the engine will not start............... 485
Ignition switch (engine switch)..... 159
Overheating .........................................494
Engine coolant....................................... 405 Capacity ................................................ 504
Checking............................................... 405
Preparing and checking before winter ....................................254
Engine coolant temperature gauge ..........................................................81
Engine immobilizer system ................. 69
Engine oil ................................................. 402 Capacity ................................................ 502
Checking................................................402
Preparing and checking before winter ....................................254
Engine switch .......................................... 159
Enhanced VSC ..................................... 234
EPS (Electronic Power Steering) ........ 235 Function ..................................................235
Warning light ...................................... 455
Event data recorder (EDR) ...................10 First-aid kit storage belt......................362
Flat tire .......................................................475
Floor mats....................................................26
Fluid
Automatic transmission ................. 505
Brake....................................................... 506
Washer .....................................................410
Fog lights..................................................... 181 Replacing light bulbs ....................... 434
Switch ......................................................... 181
Wattage ................................................ 509
Footwell light .......................................... 356 Wattage ................................................ 509
Front passenger occupant classification system ............................ 47
Front personal lights ............................357 Wattage ................................................ 509
Front seats ................................................. 120 Adjustment..............................................120
Cleaning................................................. 387
Correct driving posture .................... 28
Driving position memory................. 123
Head restraints ..................................... 127
Power easy access system ............. 124
Seat heaters ..........................................355
Seat position memory ....................... 123
Seat ventilators....................................355F