start Lexus IS250C 2010 Owners Manual

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

437
4-3. Do-it-yourself maintenance
4
Maintenance and care
10_IS250C/350C_U
10ECU-IG LH10 A
Cruise control, air conditioning sys-
tem, power steering, rain sensor, anti-
glare inside rear view mirror, shift lock
system, tire inflation pressure warning
system, vehicle stability control
11FR S/HTR LH15 ASeat heaters and ventilators, air condi-
tioning system
12FR DOOR LH20 APower windows, outside rear view
mirrors
13SECURITY7. 5 ASmart access system with push-button
start
14H-LP LVL7. 5 AAFS
15LH-IG10 A
Charging system, headlight cleaner,
rear window defogger, electric cool-
ing fans, emergency flashers, turn sig-
nal lights, back-up lights, stop lights,
mirror heaters, seat belt pretensioner,
intuitive parking assist, cruise control,
PTC heater, exhaust system, smart
access system with push-button start
16FR WIP30 AWindshield wipers
FuseAmpereCircuit

438
4-3. Do-it-yourself maintenance
10_IS250C/350C_U■
Passenger’s side instrument panel
FuseAmpereCircuit
1FR P/SEAT RH30 APo w e r s e a t
2DOOR DL15 A
3OBD7. 5 AOn-board diagnosis system
4STOP SW7. 5 A
Stop lights, multiport fuel injection sys-
tem/sequential multiport fuel injection
system, VDIM, shift lock system
5TI & TE20 AElectric tilt and telescopic steering
column
6RAD NO.310 AAudio
7GAUGE7. 5 AMeter
8IGN10 A
SRS airbag system, steering lock sys-
tem, multiport fuel injection system/
sequential multiport fuel injection sys-
tem, stop lights, smart access system
with push-button start, occupant
detection system
9ACC7. 5 A
Audio, clock, air conditioning system,
navigation system, outside rear view
mirrors, smart access system with
push-button start, glove box light,
console box light

439
4-3. Do-it-yourself maintenance
4
Maintenance and care
10_IS250C/350C_U
10CIG15 ACigarette lighter
11PWR OUTLET15 APo w e r o u t l e t
12FR DOOR RH20 APo w e r w i n d o w s , o u t s i d e r e a r v i e w
mirrors
13AM27. 5 AStarting system
14RH-IG7. 5 A
Seat belt pretensioner, intuitive park-
ing assist, automatic transmission, seat
heater and ventilator
15FR S/HTR RH15 ASeat heaters and ventilators, air condi-
tioning system
16ECU-IG RH10 A
Power seats, headlights, front fog
lights, parking lights, license plate
lights, front side marker lights, wind-
shield washer, outside rear view mir-
rors, VDIM, air conditioning system,
pre-collision seat belt, electric tilt and
telescopic steering, power windows,
navigation system, vehicle stability
control, retractable hardtop, clock
FuseAmpereCircuit

When trouble arises5
451
10_IS250C/350C_U
5-1. Essential informationEmergency flashers............... 452
If your vehicle needs to be towed................................. 453
If you think something is wrong .................................. 459
Fuel pump shut off system.... 460
Event data recorder ............... 461 5-2. Steps to take in an
emergency
If a warning light turns on or a warning buzzer
sounds... ................................. 463
If a warning message is displayed ............................ 472
If you have a flat tire (vehicles with standard
tires) ........................................ 486
If you have a flat tire (vehicles with run-flat
tires) ........................................ 495
If the engine will not start ..... 497
If the shift lever cannot be shifted from P ................. 499
If you lose your keys .............. 500
If the electronic key does not operate properly........... 501
If the vehicle battery is discharged......................... 506
If your vehicle overheats ..... 509
If the vehicle becomes stuck......................................... 512
If the retractable hardtop does not close ....... 514

454
5-1. Essential information
10_IS250C/350C_U
■Emergency towing procedureRelease the parking brake.
Shift the shift lever to N.
Put the “ENGINE START STOP” switch in ACCESSORY mode or IGNI-
TION ON mode.
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 eyelets and the cables or chains.
●If the engine is not running, the power assist for the brakes and steering will not
function, making steering and braking more difficult.
NOTICE
■To prevent causing serious da mage to the transmission
(vehicles with an automatic transmission)
Never tow this vehicle from the front with the rear wheels on the ground.
This may cause serious damage to the transmission.
■When towing a vehicle without using a towing dolly
(vehicles with a manual transmission)
The “ENGINE START STOP” switch must not be OFF.
STEP1
STEP2
STEP3

458
5-1. Essential information
10_IS250C/350C_U
Using a flat bed truckIf your Lexus is transported by a
flat bed truck, it should be tied
down at the locations shown in the
illustration.
If you use chains or cables to tie
down your vehicle, the angles
shaded in black must be 45°.
Do not overly tighten the tie downs
or the vehicle may be damaged.
NOTICE
■To prevent causing serious da mage to the transmission
(vehicles with an automatic transmission)
Never tow this vehicle from the front with the rear wheels on the ground.
■To prevent damaging the vehicle
●Do not tow the vehicle from the rear with the “ENGINE START STOP” switch
OFF.
The steering lock mechanism is not strong enough to hold the front wheel
straight.
●When raising the vehicle from the rear, ensure adequate ground clearance for
towing at the opposite end of the raised vehicle. Without adequate clearance, the
vehicle could be damaged while being towed from the rear.

460
5-1. Essential information
10_IS250C/350C_U
Fuel pump shut off system
NOTICE
■Before starting the engine
Inspect the ground under the vehicle.
If you find that fuel has leaked on to the ground, the fuel system has been damaged
and is in need of repair. Do not restart the engine.
To minimize the risk of fuel leakage when the engine stalls or an airbag
inflates upon collision, the fuel pump shut off system stops supplying fuel to
the engine.
Follow the procedure below to restart the engine after the system is
activated.
Turn the “ENGINE START STOP” switch to the ACCESSORY
mode or OFF.
Restart the engine.
STEP1
STEP2

468
5-2. Steps to take in an emergency
10_IS250C/350C_U
■The tire pressure warning light may turn on due to natural causes
The tire pressure warning light may turn on due to natural causes such as natural air
leaks or tire inflation pressure changes caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the warning light (after a few minutes).
■When a tires is replaced with a spare tire (vehicles with a spare tire)
The compact spare tire is not equipped with the tire pressure warning valve and
transmitter. If a tire goes flat, the tire pressure warning light will not turn off even
though the flat tire is replaced with the spare tire. Replace the spare tire with the
repaired tire and adjust the proper tire inflation pressure. The tire pressure warning
light will turn off after a few minutes.
■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 comes on after blinking for 1 minute frequently
If the tire pressure warning light comes on after blinking for 1 minute frequently
when the “ENGINE START STOP” switch is turned to IGNITION ON mode, have
it checked by your Lexus dealer.

470
5-2. Steps to take in an emergency
10_IS250C/350C_U
CAUTION
■Maintenance of the tires
Each tire, including the spare (if provided), should be checked monthly when cold
and inflated to the inflation pressure recommended by the vehicle manufacturer on
the vehicle placard or tire inflation pressure label (tire and loading information
label). (If your vehicle has tires of a different size than the size indicated on the vehi-
cle placard or tire inflation pressure label [tire and loading information label], you
should determine the proper tire inflation pressure for those tires.)
As an added safety feature, your vehicle has been equipped with a tire pressure
monitoring system (TPMS-tire pressure warning system) that illuminates a low tire
pressure telltale (tire pressure warning light) when one or more of your tires is sig-
nificantly under-inflated. Accordingly, when the low tire pressure telltale (tire pres-
sure warning light) illuminates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat and can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling
and stopping ability.
Please note that the TPMS (tire pressure warning system) is not a substitute for
proper tire maintenance, and it is the driver's responsibility to maintain correct tire
pressure, even if under-inflation has not reached the level to trigger illumination of
the TPMS low tire pressure telltale (tire pressure warning light).
Your vehicle has also been equipped with a TPMS (tire pressure warning system)
malfunction indicator to indicate when the system is not operating properly. The
TPMS (tire pressure warning system) malfunction indicator is combined with the
low tire pressure telltale (tire pressure warning light). When the system detects a
malfunction, the telltale will flash for approximately one minute and then remain
continuously illuminated. This sequence will continue upon subsequent vehicle
start-ups as long as the malfunction exists. When the malfunction indicator is illumi-
nated, the system may not be able to detect or signal low tire pressure as intended.
TPMS (tire pressure warning system) malfunctions may occur for a variety of rea-
sons, including the installation of replacement or alternate tires or wheels on the
vehicle that prevent the TPMS (tire pressure warning system) from functioning
properly. Always check the TPMS (tire pressure warning system) malfunction tell-
tale after replacing one or more tires or wheels on your vehicle to ensure that the
replacement or alternate tires and wheels allow the TPMS (tire pressure warning
system) to continue to function properly.