2012 Lexus IS250 ignition

5
When trouble arises
477
5-2. Steps to take in an emergency
IS350/250_U
■If the tire pressure warning system is inoperative
The tire pressure warning system will be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
●If tires not equipped with tire pressure warning valves and transmitters are used
●If the ID code on the tire pressure warning valves and transmitters is not regis-
tered in the tire pressure warning computer
●If a different set of tires has been selected using the satellite switch
●If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm2 or bar) or higher
The tire pressure warning system may be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
●If electronic devices or facilities using similar radio wave frequencies are nearby
●If a radio set at similar frequencies is in use in the vehicle
●If there is a lot of snow or ice on the vehicle, in particular around the wheels or
wheel housings
●If non-genuine Lexus wheels are used (Even if you use Lexus wheels, the tire
pressure warning system may not work properly with some types of tires.)
●If tire chains are used
■If the tire pressure warning light freque ntly comes on after blinking for 1 minute
If the tire pressure warning light frequently comes on after blinking for 1 minute
when the “ENGINE START STOP” switch is turned to IGNITION ON mode, have
it checked by your Lexus dealer.
■Customization that can be configured at Lexus dealer
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features →P. 553)

5
When trouble arises
511
5-2. Steps to take in an emergency
IS350/250_U
■Avoiding a discharged battery
●Turn off the headlights and the audio system while the engine 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, etc.
■Charging the battery
The electricity stored in the battery will discharge gradually even when the vehicle
is not in use, due to natural discharge and the draining effects of certain electrical
appliances. If the vehicle is left for a long time, the battery may discharge, and the
engine may be unable to start. (The battery recharges automatically during driving.)
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable
gas that may be emitted from the battery.
●Make sure the jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any part other than the intended terminal.
●Do not allow the jumper cables to come into contact with the “+” and “-” termi-
nals.
●Do not allow open flame or use matches, cigarette lighters or smoke near the
battery.
Maintain the engine speed of the second vehicle and turn the
“ENGINE START STOP” switch to IGNITION ON mode,
then start the vehicle’s engine.
Once the vehicle’s engine has started, remove the jumper
cables in the exact reverse order in which they were con-
nected.
Once the engine starts, have the vehicle checked at your Lexus dealer
as soon as possible.STEP5
STEP6

527
6-1. Specifications
6
Vehicle specifications
IS350/250_U
Cooling system
Ignition system
Capacity
IS350
9.6 qt. (9.1 L, 8.0 Imp. qt.)
IS250
10.9 qt. (10.3 L, 9.1 Imp. qt.)
Coolant type
Use either of the following.• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-sili-cate, non-amine, non-nitrite, and non-borate cool-
ant with long-life hybrid organic acid technology
Do not use plain water alone.
Spark plug
Make
GapDENSO FK20HBR11
0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust gap when tuning the engine.

581
Alphabetical index
IS350/250_U
If you have a flat tire ........................ 492
If you lose your keys ........................504
If you think something is wrong................................................... 469
If your vehicle becomes stuck ......516
If your vehicle has to be stopped in an emergency.............................. 518
If your vehicle needs to be
towed ................................................... 463
If your vehicle overheats..................513
Emergency flashers Switch ...................................................... 462
Engine Compartment ..................................... 397
Engine switch .......................................... 141
Hood ....................................................... 394
How to start the engine...................... 141
Identification number......................... 521
If the engine will not start ................ 501
Ignition switch.......................................... 141
Overheating...........................................513
Engine compartment cover............. 399
Engine coolant Capacity..................................................527
Checking ............................................... 404
Preparing and checking
before winter .................................... 206 Engine coolant temperature
gauge....................................................... 158
Engine immobilizer system..................90
Engine oil Capacity .................................................524
Checking ................................................ 401
Preparing and checking before winter ................................... 206
EPS .............................................................. 196
Event data recorder .................................21
First-aid kit storage belt ..................... 357
Floor mat ..................................................356
Fluid Brake ....................................................... 406
Washer ...................................................... 411
Fog lights Switch.........................................................176
Wattage ................................................. 536
Footwell lights ........................................325
Front fog lights Switch.........................................................176
Wattage ................................................. 536
Front passenger occupant
classification system .......................... 109
Front passenger's seat belt
reminder light...................................... 473
F
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

583
Alphabetical index
IS350/250_U
I/M test ..................................................... 390
IdentificationEngine ....................................................... 521
Vehicle...................................................... 521
Ignition switch ............................................141
Illuminated entry system ................... 325
Indicator lights ......................................... 164
Initialization Items to initialize .................................559
Inside rear view mirror...........................75
Interior lights Interior lights ........................................ 325
Switch .......................................................327
Wattage ................................................. 536
Jack Positioning a floor jack ................... 395
Vehicle-equipped jack ................... 492
Jack handle ..............................................492
Keyless entry..............................................45
Keys Electronic key......................................... 28
Engine switch .......................................... 141
If the electronic key does not operate properly ............................505
If you lose your keys ........................504 Key number ............................................. 28
Keyless entry ........................................... 45
Keys ............................................................. 28
Mechanical key ...................................... 29
Wireless remote control key .......... 45
Light bulbs Replacing ................................................ 451
Wattage ................................................. 536
Lights
Door courtesy lights .........................325
Emergency flasher switch ............. 462
Fog light switch .....................................176
Hazard light switch ...........................462
Headlights switch................................. 172
Interior light switch ............................ 327
Outer foot lights .................................325
Overhead courtesy light ................325
Personal light switch......................... 327
Replacing light bulbs ......................... 451
Scuff lights ..............................................325
Shift lever light......................................325
Turn signal lever .................................. 154
Vanity lights .......................................... 337
Wattage ................................................. 536
Load capacity .........................................205I
J
K
L
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

586
Alphabetical index
IS350/250_U
Smart access system with push-button start
Entry function.......................................... 33
Starting the engine ................................141
Spare tire Inflation pressure................................ 424
Storage location ................................. 492
Spark plug ................................................ 527
Specifications .........................................520
Speedometer
Speed indicator ................................... 158
Speedometer........................................ 158
Steering wheel Audio switches* ................................. 273
Manual adjustment ............................... 72
Power adjustment .................................73
Steering wheel positionmemory.................................................. 58
Storage feature ......................................329
Stuck If your vehicle becomes stuck...... 516
Sun visors .................................................336
Sunshade Rear .......................................................... 352
Roof ............................................................. 84 Switch
ECT switch ............................................. 147
Emergency flasher switch..............462
Engine switch .......................................... 141
ETCS switch .......................................... 153
Fog light switch .................................... 176
Hazard light switch ...........................462
Ignition switch ......................................... 141
Light switches.........................................172
Power door lock switch.................... 48
Power window switch ....................... 80
Satellite switches................................ 339
Transmission shift switches ............ 149
Window lock switch ........................... 80
Wiper and washer switch............... 178
Tachometer Tacho indicator ....................................158
Tachometer............................................158
Tail lights
Switch.........................................................172
Talk switch* ............................................. 299
Telephone switch* ............................... 298
Theft deterrent system
Alarm........................................................... 92
Engine immobilizer system ............. 90
Theft prevention labels.......................... 95
Tire inflation pressure ......................... 424
T