power steering Lexus IS F 2008 Do-It-Yourself Maintenance /

322
4-3. Do-it-yourself maintenance
Fuse layout and amperage ratings■ Engine compartment (type A)
FuseAmpereCircuit
1ABS 325 AVDIM
2ALT-S7. 5 ACharging system
3TURN-HAZ15 AEmergency flashers, turn signals
4IG2 MAIN20 AIG2, IGN, GAUGE
5RAD NO. 230 AAudio system
6D/C C UT20 ADOME, MPX-B
7RAD NO. 130 AAudio system
8MPX-B10 A
Headlights, front fog lights, parking
lights, license plate lights, windshield
washer, horns, power door lock sys-
tem, power windows, power seats,
electric tilt and telescopic steering
column, meters and gauges, smart
access system with push-button start,
outside rear view mirrors, air condi-
tioning system, security system
9DOME10 AInterior lights, meters and gauges
10CDS10 AElectric cooling fans

323
4-3. Do-it-yourself maintenance
4
Maintenance and care
11E/G-B60 AFR CTRL-B, ETCS, A/F, STR LOCK,
INJ2
12P/I-B60 AEFI, F/PMP, INJ
13ABS 150 AVDIM
14RH J/B-B30 AFR DOOR RH, RR DOOR RH, AM2
15VVT40 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
16MAIN30 AH-LP R LWR, H-LP L LWR, headlight
low beams
17STARTER30 ASmart access system with push-button
start
18LH J/B-B30 AFR DOOR LH, RR DOOR LH,
SECURITY
19EPS80 AElectric power steering
20ALT180 ALH J/B-AM, E/G-AM, HEATER,
FA N 1 , FA N 2 , D E F O G, R H J / B - A M
21LH J/B-AM80 A
S/ROOF, FR P/SEAT LH, TV NO.1,
A/C, FUEL OPEN, PSB, FR WIP,
H-LP LVL, LH-IG, ECU-IG LH,
PANEL, TAIL, MIR HTR, TV NO. 2,
FR S/HTR LH
22RH J/B-AM80 A
OBD, STOP SW, TI&TE, FR P/SEAT
RH, RAD NO. 3, ECU-IG RH,
RH-IG, FR S/HTR RH, ACC, CIG,
PWR OUTLET
23DEFOG50 ARear window defogger
24FA N 240 AElectric cooling fans
FuseAmpereCircuit

327
4-3. Do-it-yourself maintenance
4
Maintenance and care
■Driver’s side instrument panel
FuseAmpereCircuit
1FR P/SEAT LH30 APo w e r s e a t
2A/C7. 5 AAir conditioning system
3MIR HTR15 AOutside rear view mirror defoggers
4TV NO. 110 ADisplay
5FUEL OPEN10 AFuel filler door opener
6TV NO. 27. 5 A
7PSB30 APre-collision seat belt
8S/ROOF25 AMoon roof
9TA I L10 ATail lights, license plate lights, parking
lights, rear side marker lights
10PA N E L7. 5 ASwitch illumination, air conditioning
system, display
11RR FOG7. 5 A
12ECU-IG LH10 A
Cruise control, air conditioning sys-
tem, electric power steering, shift lock
system, moon roof, tire inflation pres-
sure warning system
13FR S/HTR LH15 ASeat heaters and ventilators

330
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
13FR DOOR RH20 APower windows, outside rear view
mirrors
14AM27. 5 ASmart access system with push-button
start
15RH-IG7. 5 A
Seat belts, intuitive parking assist,
automatic transmission, seat heaters
and ventilators
16FR S/HTR RH15 ASeat heaters and ventilators
17ECU-IG RH10 A
Power seats, smart access system with
push-button start, outside rear view
mirrors, VDIM, air conditioning sys-
tem, pre-collision seat belt, electric tilt
and telescopic steering, power win-
dows, navigation system
■After a fuse is replaced
●If the lights do not turn on even afte r the fuse has been replaced, a bulb may
need replacement. ( P. 3 3 4 )
●If the replaced fuse blows again, have the vehicle inspected by your Lexus
dealer.
■If there is an overload in the circuits
The fuses are designed to blow before the entire wiring harness is damaged.

5
When trouble arises
341
5-1. Essential information
■Emergency towing procedureRelease the parking brake.
Shift the shift lever to N.
Put the “ENGINE START STOP” switch in ACCESSORY mode (engine
off) or IGNITION ON mode (engine running).
CAUTION
■Caution while towing
●Use extreme caution when towing the vehicle.
Avoid sudden starts or erratic driving maneuvers which place excessive stress on
the emergency towing eyelet and the cables or chains.
●If the engine is not running, the power assi st for the brakes and steering will not
function, making steering and braking more difficult.
NOTICE
■To prevent causing serious damage to the transmission
Never tow this vehicle from the rear with four wheels on the ground. This may cause
serious damage to the transmission.
STEP1
STEP2
STEP3

352
5-2. Steps to take in an emergency
Warning lightWarning light/Details
(U.S.A.)

(Canada)
ABS warning lightIndicates a malfunction in:
•The ABS; or
• The brake assist system.
Electric power steering warning lightIndicates a malfunction in the EPS (Electric Power Steering)
system.
Pre-collision system warning light (if equipped)Indicates a malfunction in the pre-collision system.
■Electric power steering warning light
When the battery is low or when the voltage drops temporarily, the electric power
steering warning light may come on.
CAUTION
■When the electric power steering warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, firmly hold and
operate it using more force than usual.

417
6-1. Specifications
6
Vehicle specifications
■Temperature A, B, C
The temperature grades are A (the hi ghest), B, and C, representing
the tire's resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded.
Excessive speed, underinflation, or excess ive loading, either separately or in
combination, can cause heat build up and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer.
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of transmission, power
steering, power brakes, power windows, power seats,
radio and heater, to the extent that these items are
available as factory-installed equipment (whether
installed or not)

436
Abbreviation list
Abbreviation/Acronym list
ABBREVIATIONSMEANING
ABSAnti-lock Brake System
AFSAdaptive Front-lighting System
AI-SHIFTArtificial Intelligence Shift
ALRAutomatic Locking Retractor
CALCalibration
CRSChild Restraint System
DISPDisplay
ECUElectronic Control Unit
EDREvent data recorder
ELREmergency Locking Retractor
EPSElectric Power Steering
GAWRGross Axle Weight Rating
I/MEmission inspection and maintenance
LEDLight Emitting Diode
LSDLimited Slip Differential
MMTMethylcyclopentadienyl Manganese Tricarbonyl
M + SMud and Snow
MTBEMethyl Tertiary Butyl Ether
OBDOn Board Diagnostics
PCSPre-Collision System
SRSSupplemental Restraint System
TINTire Identification Number
TPMSTire Pressure Warning System
TRACTraction Control
VDIMVehicle Dynamics Integrated Management

441
Alphabetical index
Electric power steering ....................... 166
Electronic keyIf the electronic key does not operate properly ............................ 386
Emergency, in case of If the engine will not start ............... 383
If the shift lever cannot be shifted from P ................................... 384
If the vehicle has discharged battery.................................................. 389
If the warning buzzer sounds......350
If the warning light turns on ..........350
If the warning message is displayed ............................................ 360
If you have a flat tire .........................374
If you lose your keys ........................385
If you think something is wrong................................................... 346
If the electronic key does not operate properly ............................ 386
If your vehicle becomes stuck .... 395
If your vehicle needs to be towed ................................................... 340
If your vehicle overheats................ 392 Engine
ACCESSORY mode......................... 114
Compartment......................................282
Engine switch .......................................... 114
Hood ........................................................ 279
How to start the engine ..................... 114
Identification number ...................... 399
If the engine will not start............... 383
Ignition switch ......................................... 114
Overheating .........................................392
Engine compartment cover .............283
Engine coolant Capacity ................................................ 403
Checking .............................................. 288
Preparing and checking before winter .....................................180
Engine coolant temperature gauge....................................................... 128
Engine immobilizer system.................. 70
Engine oil Capacity .................................................402
Checking ...............................................284
Preparing and checking before winter .....................................180
Engine oil maintenance data............286
EPS .............................................................. 166
Event data recorder ............................348E

445
Alphabetical index
Seat heaters................................. 242, 244
Seat position memory ........................... 48
Seat ventilators.......................................244
Seating capacity ..................................... 179
SeatsAdjustment ...............................................44
Adjustment precautions.....................44
Child seats/child restraint system installation ............................. 96
Cleaning .................................................267
Driver’s seat position memory ...... 45
Front passenger seat position memory ................................................. 48
Head restraint ........................................ 50
Properly sitting in the seat.................75
Seat heaters............................... 242, 244
Ventilated seats ...................................244
Service reminder indicators ............. 132
Shift lever If the shift lever cannot be shifted from P ................................... 384
Transmission ........................................... 118
Shift lever light ........................................223
Shift lock system ................................... 384
Shopping bag hooks ............................. 251
Side airbags ................................................ 77
Side marker lights Switch ........................................................ 139
Side mirrors Adjusting and folding ......................... 60
Mirror position memory ................... 45
Smart access system with push-button startEntry function .......................................... 22
Starting the engine................................ 114 Spare tire
Inflation pressure ................................307
Spare tire ................................................ 374
Spark plug................................................403
Specifications ........................................ 398
Speech command switch*
Speedometer .......................................... 128
Steering wheel Adjustment ............................................... 57
Audio switches...................................... 221
Steering wheel positionmemory .................................................. 45
Storage feature...................................... 227
Stuck If your vehicle becomes stuck .... 395
Sun visors ................................................. 233
Sunshade ..................................................... 65
Switch Engine switch .......................................... 114
Fog light switch .....................................142
F-sport mode total control switch...........................................120, 169
Ignition switch ......................................... 114
Light switches ....................................... 139
Power door lock switch .................... 37
Power window switch ........................ 62
Satellite switches.................................236
Transmission shift switches ...................................... 120, 122
Window lock switch............................ 62
Wiper and washer switch............... 143