maintenance Lexus IS250 2008 Using the air conditioning system and defogger / LEXUS 2008 IS250 (OM53699U) Manual PDF

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4-3. Do-it-yourself maintenance
4
Maintenance and care
FuseAmpereCircuit
13FR DOOR RH20 APower windows, outside rear view
mirrors
14AM215 ASmart access system with push-button
start
15RH-IG7. 5 A
Seat belts, intuitive parking assist,
automatic transmission, seat heater
and ventilator
16FR S/HTR RH15 ASeat heaters and ventilators
17ECU-IG RH10 A
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 4 2 )
●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.

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4-3. Do-it-yourself maintenance
CAUTION
■To prevent system breakdowns and vehicle fire
●Observe the following precautions.
Failing to do so may cause damage, and possibly a fire or injury.
●Never use a fuse of a higher amperage rating than indicated, or use any other
object in place of a fuse.
●Always use a genuine Lexus fuse or equivalent.
Never replace a fuse with a wire, even as a temporary fix.
This can cause extensive damage or even fire.
●Do not modify fuses or the fuse box.
NOTICE
■Before replacing fuses
Have the cause of electrical overload determined and repaired by your Lexus
dealer.

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4-3. Do-it-yourself maintenance
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Maintenance and care
Headlight aim
■Vertical movement adjusting bolts
Adjustment bolt A
Adjustment bolt B
■ Before checking the headlight aim
Make sure the vehicle has a full tank of gas and the area around
the headlight is not deformed.
Park the vehicle on level ground.
Sit in the driver’s seat.
Bounce the vehicle several times.
■ Adjusting the headlight aim
Turn bolt A in either direction
using a Phillips-head screw-
driver.
Remember the turning direction
and the number of turns in mind.
Turn bolt B the same number of
turns and in the same direction
as step 1 using a Phillips-head
screwdriver.
If the error is over the value
specified above, take the vehicle
to your Lexus dealer to adjust
the headlight aim.
STEP1
STEP2
STEP3
STEP4
STEP1
STEP2

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4-3. Do-it-yourself maintenance
Light bulbs
You may replace the following bulbs yourself. For more information about
replacing other light bulbs, contact your Lexus dealer.
■Preparing a replacement light bulb
Check the wattage of the light bulb being replaced. ( P. 420)
■ Removing the engine compartment cover
 P. 2 9 4
■ Front bulb locations
■ Rear bulb locations
Parking light
Headlight
high beam
Rear turn signal light
Back-up light

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4-3. Do-it-yourself maintenance
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Maintenance and care
Replacing light bulbs■ Headlight high beams
Release the lock and remove the
cover.
Turn the bulb base counterclock-
wise.
Unplug the connector while
depressing the lock release.
STEP1
STEP2
STEP3

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4-3. Do-it-yourself maintenance
■Parking lights
Release the lock and remove the
cover.
Turn the bulb base counterclock-
wise.
Remove the light bulb.
■ Back-up light
Open the trunk door and remove
the trunk panel cover clips.
STEP1
STEP2
STEP3
STEP1

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4-3. Do-it-yourself maintenance
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Maintenance and care
Partly remove the trunk panel
cover and turn bulb bases coun-
terclockwise.
Remove the light bulb.
■ Rear turn signal lights
Open the trunk door and remove
the cover.
Turn the bulb base counterclock-
wise.STEP2
STEP3
STEP1
STEP2

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4-3. Do-it-yourself maintenance
Remove the light bulb.
■ Bulbs other than the above
If any of the bulbs listed below has burnt out, have your Lexus dealer
replace it.
●Headlight low beams (halogen bulbs)
● Headlight high and low beams (discharge bulbs)
● Front fog lights
● Front turn signal lights
● Front side marker lights
● Stop/tail lights
● Tail lights
● Rear side marker lights
● High mounted stoplight
● License plate lightsSTEP3

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4-3. Do-it-yourself maintenance
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Maintenance and care
■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 inform ation 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 in side the headlight.
■Discharge headlights (if equipped)
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.

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4-3. Do-it-yourself maintenance
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 en tering 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 headligh t bulbs, connectors,
power supply circuits, or related components.
Doing so could result in electric shock and serious injury or death.
■Discharge headlights (if equipped)
●Contact your Lexus dealer be fore 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 wi ll 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.