2007 Lexus IS250 ECU

310
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
27GLW PLG250 APTC heater
28E/G-AM60 AHeadlight cleaners, front fog lights,
parking lights, air conditioning system
29LH 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,
PA N E L , TA I L , M I R H T R ,
FR S/HTR LH

313
4-3. Do-it-yourself maintenance
4
Maintenance and care
■Driver’s side instrument panel
FuseAmpereCircuit
1FR P/SEAT LH30APo w e r s e a t
2A/C7. 5 AAir conditioning system
3MIR HTR15AOutside rear view mirror defoggers
4TV NO.110ADisplay
5FUEL OPEN10AFuel filler door opener
6TV NO.27. 5 A
7PSB30APre-collision seat belt
8S/ROOF25AElectric moon roof
9TA I L10ATail lights, license plate lights, parking
lights
10PA N E L7. 5 ASwitch illumination, air conditioning
system, display
11RR FOG7. 5 A
12ECU-IG LH10A
Cruise control, air conditioning sys-
tem, power steering, rain sensor, anti-
glare inside rear view mirror, shift lock
system, moon roof, tire inflation pres-
sure warning system
13FR S/HTR LH15ASeat heaters and ventilators

314
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
14RR DOOR LH20APo w e r w i n d o w s
15FR DOOR LH20APo w e r w i n d o w s
16SECURITY7. 5 ASmart access system with push-button
start
17H-LP LVL7. 5 AAFS
18LH-IG10A
Charging system, headlight cleaner,
rear window defogger, electric cool-
ing fans, emergency flashers, turn sig-
nal lights, back-up lights, stop lights,
mirror heaters, sun shade, seat belts,
Lexus parking assist-sensor, cruise
control, air conditioning system, PTC
heater
19FR WIP30AWindshield wipers

316
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
13FR DOOR RH20APower windows, outside rear view
mirrors
14AM215ASmart access system with push-button
start
15RH-IG7. 5 A
Seat belts, Lexus parking assist-sen-
sor, automatic transmission, seat
heater and ventilator
16FR S/HTR RH15ASeat heaters and ventilators
17ECU-IG RH10A
Power seats, smart access system with
push-button start, AWD system, out-
side rear view mirrors, VDIM, VSC,
air conditioning system, pre-collision
seat belt, electric tilt and telescopic
steering, power windows, navigation
system
■After a fuse is replaced
●If the lights do not turn on even after the fuse has been replaced, a bulb may
need replacement. (P. 3 1 9 )
●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.

324
4-3. Do-it-yourself maintenance
■When replacing the front left headlight and parking light bulbs
■Condensation build-up on the inside of the lens
Contact your Lexus dealer for more information in the following situations. Tempo-
rary condensation build-up on the inside of the headlight lens does not indicate a
malfunction.
●Large drops of water are built up on the inside of the lens.
●Water has built up inside the headlight.
■Discharge headlights
If voltage to the discharge bulbs is insufficient, the bulbs may not come on, or may
go out temporarily. The discharge bulbs will come on when normal power is
restored.
Remove the securing bolt and move the
washer fluid filler opening to allow easy
access to the light bulbs.
After replacing the bulbs, make sure to
secure the washer fluid filler opening with the
bolt.

325
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■Replacing light bulbs
●Turn off the headlights. Do not attempt to replace the bulb immediately after turn-
ing off the headlights.
The bulbs become very hot and may cause burns.
●Do not touch the glass portion of the light bulb with bare hands. Hold the bulb by
the plastic or metal portion.
If the bulb is scratched or dropped it may blow out or crack.
●Fully install light bulbs and any parts used to secure them. Failing to do so may
result in heat damage, fire, or water entering the headlight unit. This may damage
the headlights or cause condensation to build up on the lens.
●Do not attempt to take apart or repair the low beam headlight bulbs, connectors,
power supply circuits, or related components.
Doing so could result in electric shock and serious injury or death.
■Discharge headlights
●Contact your Lexus dealer before replacing discharge headlights (including light
bulbs).
●Do not touch the high-intensity discharge headlight’s high voltage socket when
the headlights are turned on.
An extremely high voltage of 20000 V will be discharged and could result in
serious injury or death by electric shock.
■To prevent damage or fire
Make sure bulbs are fully seated and locked.

328
5-1. Essential information
If your vehicle needs to be towed
Before towing
The following may indicate a problem with your transmission. Contact
your Lexus dealer before towing.
●The engine is running, but the vehicle will not move.
●The vehicle makes an abnormal sound.
Emergency towing
If a tow truck is not available, in an emergency your vehicle may be tem-
porarily towed using a cable or chain secured to the emergency towing
eyelet(s). This should only attempted on hard, surfaced roads for short
distances at low speeds.
A driver must be in the vehicle to steer and operate the brakes. The vehi-
cle’s wheels, drive train, axles, steering and brakes must be in good condi-
tion.
Towing eyelets
If towing is necessary, we recommend having your vehicle towed by your
Lexus dealer or a commercial towing service, using a lift-type truck or a flat
bed truck.
Use a safety chain system for all towing, and abide by all state/provincial
and local laws.
If towing from the rear, the vehicle’s front wheels and axles must be in good
condition. (P. 332)
If they are damaged, use a towing dolly or flat bed truck.

330
5-1. Essential information
Installing towing eyelets
Remove the eyelet cover using a
flat head screwdriver.
To protect the bodywork, place a
rag between the screwdriver and
the vehicle body, as shown in the
illustration.
Insert the towing eyelet into the
hole and tighten partially by hand.
Tighten down the towing eyelet
securely using a wheel nut wrench.
STEP1
STEP2
STEP3
■Location of the emergency towing eyelet
P. 3 5 8