2010 Lexus IS250C ABS

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2-4. Using other driving systems
2
When driving
10_IS250C/350C_U
CAUTION
■TRAC may not operate effectively when
Directional control and power may not be achievable while driving on slippery road
surfaces, even if the TRAC system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
■When the VSC is activated
The slip indicator light flashes and a warning buzzer sounds. Always drive carefully.
Reckless driving may cause an accident. Exercise particular care when the indica-
tor light flashes and a buzzer sounds.
■When TRAC and VSC are off
Be especially careful and drive at a speed appropriate to the road conditions. As
these are systems to ensure vehicle stability and driving force, do not turn off TRAC
and VSC unless necessary.
■Replacing tires
Make sure that all tires are of the specified size, brand, tread pattern and total load
capacity. In addition, make sure that the tires are inflated to the recommended tire
pressure level.
The ABS and VSC systems will not function correctly if different tires are fitted on
the vehicle.
Contact your Lexus dealer for further information when replacing tires or wheels.
■Handling of tires and suspension
Using tires with any kind of problem or modifying the suspension will affect the driv-
ing assist systems, and may cause the system to malfunction.

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4-3. Do-it-yourself maintenance
10_IS250C/350C_U
Radiator and condenserCheck the radiator and condenser and clear any foreign objects.
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.
Brake fluid■ Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
Make sure to check the fluid type and prepare the necessary items.
■ Adding fluid
CAUTION
■When the engine is hot
Do not touch the radiator or condenser, as they may be hot and you may be burned.
Fluid typeFMVSS No.116 DOT 3 or SAE J1703 brake fluid
ItemsClean funnel
■Brake fluid can absorb moisture from the air
Excess moisture in the fluid can cause a dangerous loss of braking efficiency. Use
only newly opened brake fluid.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
10_IS250C/350C_U
Checking and replacing fuses
If any of the electrical components do not operate, a fuse may have blown.
If this happens, check and replace the fuses as necessary.
Turn the “ENGINE START STOP” switch OFF.
Engine compartment (type B fuse box): Remove the engine
compartment cover. ( →P. 394)
Open the fuse box cover.
Engine compartment (type A fuse box)
Push the tabs in and lift the lid
off.
Engine compartment (type B fuse box) Push the tabs in and lift the lid
off.STEP1
STEP2
STEP3

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4-3. Do-it-yourself maintenance
10_IS250C/350C_U
Removing the front controller (engine compartment: type B fuse box)
Lift the lid off while pushing the
tabs on either side.
Ty p e C Normal fuse
Blown fuse
Contact your Lexus dealer.
Ty p e DNormal fuse
Blown fuse
Contact your Lexus dealer.

432
4-3. Do-it-yourself maintenance
10_IS250C/350C_U
9E/G-B60 AFR CTRL-B, ETCS, ALT-S, A/F, TEL,
STR LOCK
10ABS150 AVDIM
11RH J/B-B30 AFR DOOR RH, AM2
12MAIN30 AH-LP R LWR, H-LP L LWR
13STARTER30 ASmart access system with push-button
start
14LH J/B-B30 AFR DOOR LH, SECURITY
15P/ I - B60 AINJ, F/PMP, EFI
16EPS80 APo w e r s t e e r i n g
17ALT150 A
LH J/B-AM, E/G-AM, GLW PLG2,
HEATER, FAN1, FAN2, ABS2, RH
J/B-AM, GLW PLG1, RR R/B-AM
18RR R/B-AM80 A
DEFOG, PSB, ROOF RH, ROOF
LH, LGG RH, LGG LH, LGG LCK
RH, LGG LCK LH, P-TRAY MAIN,
P-T R AY S I D E
19GLW PLG150 APTC heater
20RH 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, DOOR DL
21ABS230 AVDIM
22FA N 240 AElectric cooling fans
23FA N 140 AElectric cooling fans
24HEATER50 AAir conditioning system
25GLW PLG250 APTC heater
FuseAmpereCircuit

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5-2. Steps to take in an emergency
10_IS250C/350C_U
Have the vehicle inspected by your Lexus dealer immediately.Failing to investigate the cause of the following warnings may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Warning lightWarning light/Details
(U.S.A.)
(Canada)
Malfunction indicator lamp Indicates a malfunction in:
• The electronic engine control system;
• The electronic throttle control system; or
• The electronic automatic transmission control system.
SRS warning lightIndicates a malfunction in:
• The SRS airbag system; or
• The seat belt pretensioner system.
(U.S.A.)
(Canada)
“ABS” warning lightIndicates a malfunction in:
•The ABS;
• The brake assist system.
Electric power steering system 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.

5
When trouble arises
493
5-2. Steps to take in an emergency
10_IS250C/350C_U
CAUTION
■When using the compact spare tire
●Remember that your compact spare tire is specifically designed for use with your
vehicle. Do not use your compact spare tire on another vehicle.
●Do not use two compact spare tires simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, deceleration and braking, as well as sharp cornering.
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failing to observe
this precaution may lead to an accident causing death or serious injury.
■When the spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly:
●ABS & brake assist
●VSC
●TRAC
●VDIM
●EPS
●Navigation system (if equipped)
●Intuitive parking assist (if equipped)
●Dynamic radar cruise control (if equipped)
●Cruise control (if equipped)
●PCS (if equipped)
●AFS (if equipped)

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10_IS250C/350C_U
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
ECTElectronic Controlled Transmission
ECUElectronic Control Unit
EDREvent data recorder
ELREmergency Locking Retractor
EPSElectric Power Steering
ETCSElectronic Throttle Control System
GAWRGross Axle Weight Rating
I/MEmission inspection and maintenance
LATCHLower Anchors and Tethers for Children
LEDLight Emitting Diode
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