2004 Lexus IS300 wiring

GAUGES, METERS AND SERVICE REMINDER INDICATORS
51
(b) Driver's Seat Belt Reminder Light andBuzzer
This light and buzzer remind you to buckle up the driver's seat
belt.
Once the ignition key is turned to ºONº or ºSTARTº, the
reminder light flashes and buzzer sounds if the driver's seat
belt is not fastened. Unless the driver fastens the belt, the light
stays flashing and the buzzer stops after about 4 to 8 seconds.
(c) Front Passenger's Seat Belt Reminder Light
This light reminds you to buckle up the front passenger's seat
belt.
Once the ignition key is turned to ºONº or ºSTARTº, the
reminder light flashes if a passenger sits in the front passenger
seat and does not fasten the seat belt. Unless the front
passenger fastens the belt, the light stays flashing. However,
if a front passenger uses an additional seat cushion, the light
may not flash even when the seat belt is not buckled up.
If luggage or other load is placed on the front passenger seat,
depending on its weight and how it is placed on the seat,
built-in sensors in the seat cushion may detect the pressure,
causing the reminder light to come on.
(d) SRS Warning Light
The indicator comes on when the ignition key is turned to
the ºACCº or ºONº position. It goes off after about 6
seconds. This means the SRS airbags and front seat belt
pretensioners are operating properly.
The SRS warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensors, front seat belt pretensioner assemblies, inflators,
warning light, interconnecting wiring and power sources.
If either of the following conditions occurs, this indicates a
malfunction somewhere in the components monitored by the
warning light system. Contact your Lexus dealer as soon as
possible to service the vehicle.
 When the ignition key is turned to the ºACCº or ºONº
position, the light does not come on, remains on or flashes.
 The light comes on or starts flashing while driving.
If the light stays on, it indicates that the driver and front
passenger airbags fail. If the light flashes, the side and curtain
shield airbags and/or seat belt pretensioners fail.
03 07.09

OCCUPANT RESTRAINT SYSTEMS
121
SV16068

1SRS warning light
2Seat belt pretensioner assemblies
3Airbag sensor assembly
4Front airbag sensors
The seat belt pretensioner system consists mainly of the
above components, and their locations are shown in the
illustration.
The seat belt pretensioners are controlled by the airbag sensor
assembly. The airbag sensor assembly consists of a safing
sensor and airbag sensor.
When the seat belt pretensioners are activated, an operating
noise may be heard and a small amount of non-toxic gas may
be released. This does not indicate that a fire is occurring. This
gas is normally harmless.
Once the seat belt pretensioners have been activated, the seat
belt retractors remain locked.
CAUTION
Do not modify, remove, strike or open the seat belt
pretensioner assemblies, airbag sensor or surrounding
area or wiring. Failure to follow these instructions may
prevent the seat belt pretensioners from activating
correctly, cause sudden operation of the system or
disable the system, which could result in death or
serious injury. Consult your Lexus dealer about any
repair and modification.
03 07.09

OCCUPANT RESTRAINT SYSTEMS
122
NOTICE
Do not perform any of the following changes withoutconsulting your Lexus dealer. Such changes caninterfere with proper operation of the seat beltpretensioners in some cases.
Installation of electronic devices such as a mobiletwo-way radio, cassette tape player or compact disc
player.
Repairs on or near the front seat belt retractor assemblies.
Modification of the suspension system.
Modification of the front end structure.
Attachment of a grille guard (bull bar, kangaroo bar,etc.), snowplow, winches or any other equipment tothe front end.
Repairs made on or near the front fenders, front endstructure or console.
SV16061
This indicator comes on when the ignition switch is turned
to the ºACCº or ºONº position. It goes off after about 6
seconds. This means the seat belt pretensioners are
operating properly.
The warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensors, seat belt pretensioner assemblies, inflators, warning
light, interconnecting wiring and power sources. (For details,
see ºService reminder indicators and warning buzzersº on
page 48.)
If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
 When the ignition switch is turned to the ºACCº or ºONº
position, the light does not come on, remains on or flashes.
 The light comes on or starts flashing while driving.
03 07.09

OCCUPANT RESTRAINT SYSTEMS
130
Do not modify or remove any wiring. Do not modify,
remove, strike or open any components, such as the
steering wheel pad, steering wheel, column cover,
dashboard near the front passenger airbag, front
passenger airbag cover, front passenger airbag or
airbag sensor assembly. Doing so may prevent the
front airbag system from activating correctly, cause
sudden activation of the system or disable the
system, which could result in death or serious injury.
Failure to follow these instructions can result in death
or serious injury. Consult your Lexus dealer about any
repair and modification.NOTICE
Do not perform any of the following changes without consulting your Lexus dealer. Such changes caninterfere with proper operation of the SRS front airbagsystem in some cases.
Installation of electronic devices such as a mobiletwo-way radio, cassette tape player or compact disc
player.
Modification of the suspension system.
Modification of the front end structure.
Attachment of a grille guard (bull bar, kangaroo bar, etc.), snowplow, winches or any other equipment tothe front end.
Repairs made on or near the front fenders, front endstructure, console, steering column, steering wheelor dashboard near the front passenger airbag.
03 07.09

OCCUPANT RESTRAINT SYSTEMS
131
SV16061
The indicator comes on when the ignition switch is turned
to the ºACCº or ºONº position. It goes off after about 6
seconds. This means the SRS front airbags are operating
properly.
This warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensors, seat belt pretensioner assemblies, inflators, warning
light, interconnecting wiring and power sources. (For details,
see ºService reminder indicators and warning buzzersº on
page 48.)If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioner. Contact
your Lexus dealer as soon as possible.

When the ignition switch is turned to the ºACCº or ºONº
position, the light does not come on, remains on or flashes.
 The light comes on or starts flashing while driving.
If the light stays on, it indicates that the front airbags have a
problem. If the light flashes, the side and curtain shield airbags
have a problem.
03 07.09

OCCUPANT RESTRAINT SYSTEMS
139
NOTICE
Do not perform any of the following changes withoutconsulting your Lexus dealer. Such changes caninterfere with proper operation of the SRS side airbagand curtain shield airbag system in some cases.
Installation of electronic devices such as a mobiletwo-way radio, cassette tape player or compact disc
player.
Modification of the suspension system.
Modification of the side structure of the passenger compartment.
Repairs made on or near the console or front seat.
SV16061
The indicator comes on when the ignition switch is turned
to the ºACCº or ºONº position. It goes off after about 6
seconds. This means the SRS side airbags and curtain
shield airbags are operating properly.
The warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensors, seat belt pretensioner assemblies, inflators, warning
light, interconnecting wiring and power sources. (For details,
see ºService reminder indicators and warning buzzersº on
page 48.)
If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
 When the ignition key is turned to the ºACCº or ºONº
position, the light does not come on, remains on or flashes.
 The light comes on or starts flashing while driving.
03 07.09

STARTING AND DRIVING
237
HOW TO START THE ENGINE
Before cranking
1. Apply the parking brake firmly.
2. Turn off unnecessary lights and accessories.
3.Manual transmission : Press the clutch pedal to the floor
and shift the transmission into neutral. Hold the clutch pedal
to the floor until the engine is started. A starter safety device
will prevent the starter from operating if the clutch pedal is not
fully depressed.
Automatic transmission : Put the selector lever in ºPº. If you
need to restart the engine while the vehicle is moving, put the
selector lever in ºNº. A starter safety device will prevent the
starter from operating if the selector lever is in any drive
position.
4. For automatic transmission only :Depress the brake
pedal and hold it to the floor until driving off.
Starting the engine
Before starting the engine, be sure to follow the instructions in
ºBefore crankingº.
Normal starting procedure
The multiport fuel injection system/sequential multiport fuel
injection system in your engine automatically controls the
proper air-fuel mixture for starting. You can start a cold or hot
engine as follows:
With your foot off the accelerator pedal, crank the engine by
turning the key to ºSTARTº. Release it when the engine starts. Engine should be warmed up by driving, not in idle. For
warming up drive with smoothly turning engine until engine
coolant temperature is within normal range.
If the engine stalls ...
Simply restart it , using the correct procedure given in normal
starting.
If the engine will not start
See ºIf your vehicle will not startº on page 281.
NOTICE
Do not crank for more than 30 seconds at a time. This
may overheat the starter and wiring systems.
Do not race a cold engine.
If the engine becomes difficult to start or stallsfrequently, have the engine checked immediately.
03 07.09

IN CASE OF AN EMERGENCY
282
(b) Starting a flooded engine
If the engine will not start, your engine may be flooded
because of repeated cranking.
If this happens, turn the key to ºSTARTº with the accelerator
pedal fully depressed. Continue this operation for 30 seconds
and then stop cranking. Then try starting the engine with your
foot off the accelerator pedal.
If the engine does not start after 30 seconds of cranking,
release the key, wait a few minutes and try again.
If the engine still will not start, it needs adjustment or repair.
Call a Lexus dealer, Roadside Assistance or Customer
Service Assistance. (See ºForewordº.)
NOTICE
Do not crank for more than 30 seconds at a time. This may overheat the starter and wiring systems.
(c) Jump starting
To avoid serious personal injury and damage to your
vehicle which might result from battery explosion, acid
burns, electrical burns, or damaged electronic
components, these instructions must be followed
precisely.
If you are unsure about how to follow this procedure, we
strongly recommend that you seek help from your Lexus
dealer, Roadside Assistance or Customer Service Assistance.
(See ºForewordº.)
CAUTION
 Batteries contain sulfuric acid which is poisonous
and corrosive. Wear protective safety glasses when
jump starting, and avoid spilling acid on your skin,
clothing, or vehicle.
 If you should accidentally get acid on yourself or in
your eyes, remove any contaminated clothing and
flush the affected area with water immediately. Then
get immediate medical attention. If possible,
continue to apply water with a sponge or cloth while
en route to the medical office.
 The gas normally produced by a battery will explode
if a flame or spark is brought near. Use only
standardized jumper cables and do not smoke or
light a match while jump starting.
03 07.09