sensor Lexus IS300 2001 Maintenance Schedule / LEXUS 2001 IS300 OWNER'S MANUAL (OM53437)

SWITCHES
22
HEADLIGHT SWITCH
SS12002a
To turn the lights on, twist the knob on the end of the lever.
FIRST CLICKSTOP: Only the parking, tail, license plate, side
marker and instrument panel lights turn on.
SECOND CLICKSTOP: Headlights also turn on.
THIRD CLICKSTOP (ºAUTOº): The headlights and all other
lights automatically turn on depending on the darkness of the
surroundings.*
Manually twist the knob to the second clickstop to turn on
the headlights if they are needed immediately when
entering a dark tunnel, parking structure, etc.
When the headlight switch is turned to the first or second
clickstop, the brightness of the instrument cluster will be
reduced slightly unless the instrument panel light control knob
is turned fully on.
NOTE: *The operating condition or sensitivity can be changed. Ask your Lexus dealer for details.
SV12015
The automatic light control sensor is on top of the driver's side
instrument panel.
Do not place anything on the instrument panel, and/or do not
affix anything on the windshield to block this sensor.
When the headlights come on, the lights automatically turn off
about 30 seconds after any of the doors is opened and closed
with the ignition key turned to the ºACCº or ºLOCKº position\
.*
When only the taillights come on: The lights automatically turn
off with the driver's door opened and the ignition key turned to
the ºACCº or ºLOCKº position.
To turn them on again, turn the ignition key to the ºONº position,
or turn the headlight switch off and then twist the knob until the
first or second clickstop. If you are going to park for over one
week, make sure the headlight switch is off.
NOTE: *The time before turning off the lights can be changed. Ask your Lexus dealer for details.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
40
The light does not come on even if the parking brake is
applied when the ignition key is in the ºONº position.
 The light does not come on even if the ignition key is turned
on with the parking brake released.
A warning light turning on briefly during operation does not
indicate a problem.
CAUTION
If either of the following conditions occurs, immediately
stop your vehicle at a safe place and contact your Lexus
dealer.
 The light does not turn off even after the parking
brake is released while the engine is running.
In the case, the brakes may not work properly and
your stopping distance will become longer. Depress
the brake pedal firmly and bring the vehicle to an
immediate stop.
 The brake system warning light remains on together
with the ºABSº warning light.
In this case, not only the anti±lock brake system will
fail but also the vehicle will become extremely
unstable during braking.
(b) Driver's Seat Belt Reminder Light and
Buzzer
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.
If luggage 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.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
41
(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 warning light system monitors the airbag sensor
assembly, front airbag sensors, side airbag sensors, door side
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 parts 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 airbags
and/or seat belt pretensioners fail.
(e) Discharge Warning Light
This light warns that the battery is being discharged.
If it comes on while you are driving, stop the vehicle, turn off the
engine, and check for the cause. Look first at the engine drive
belt.
 If it is loose or broken, the generator will not charge the
battery properly.
 If the belt is O.K., there is a problem somewhere in the
charging system.
The engine ignition will continue to operate, however, until the
battery is discharged. Turn off the air conditioning, blower,
radio, etc., and drive directly to the nearest Lexus dealer or
repair shop.
NOTICE
Do not continue driving if the engine drive belt is broken or loose.

COMFORT ADJUSTMENT
86
CAUTION
After inserting the tab, make sure the tab and buckle
are locked and that the belt is not twisted.
 Do not insert coins, clips, etc. in the buckle as this
may prevent you from properly latching the tab and
buckle.
 If the seat belt does not function normally,
immediately contact your Lexus dealer. Do not use
the seat until the seat belt is fixed. It cannot protect
an adult occupant or your child from injury.
Front seat belt pretensioners
SV16069
The driver and front passenger's seat belt pretensioners
are designed to be activated in response to a severe
frontal impact.
When the airbag sensor detects the shock of a severe frontal
impact, the front seat belts are quickly drawn back by the
retractor so that the belts snugly restrain the front seat
occupants.
The front seat belt pretensioners are activated even with no
passenger in the front seat.
Collisions occurring at certain speeds and angles may cause
the seat belt pretensioners and SRS airbags not to operate all
together.

COMFORT ADJUSTMENT
87
SV16061
This 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 front seat belt pretensioners are
operating properly.
The warning light system monitors the airbag sensor
assembly, front airbag sensors, side airbag sensors, door side
airbag sensors, front seat belt pretensioner assemblies,
inflators, warning light, interconnecting wiring and power
sources. (For details, see ºService reminder indicators and
warning buzzersº on page 38.)
SV16068

1Front airbag sensors
2Seat belt pretensioner assemblies
3SRS warning light
4Airbag sensor assembly
The front seat belt pretensioner system consists mainly of the
above components and their locations are shown in the
illustration.
The front seat belt pretensioners are controlled by the airbag
sensor assembly. The airbag sensor assembly consists of a
safing sensor and airbag sensor.
When the front seat belt pretensioners are activated, an
operating noise may be heard and a small amount of
smoke±like gas may be released. This gas is harmless and
does not indicate that a fire is occurring.
Once the front seat belt pretensioners have been activated, the
seat belt retractors remain locked.

COMFORT ADJUSTMENT
88
CAUTION
Do not modify, remove, strike or open the front seat belt
pretensioner assemblies, airbag sensor or surrounding
area or wiring. Doing any of these may cause sudden
operation of the front seat belt pretensioners or disable
the system, which could result in death or serious
injury.
Failure to follow the instruction can result in death or
serious injury.
NOTICE
Do not perform any of the following changes without consulting your Lexus dealer. Such changes caninterfere with proper operation of the front 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.

COMFORT ADJUSTMENT
91
SS16039

Side airbags
In response to a severe side impact, the side airbags for
the driver or front passenger work together with the seat
belts to help reduce injury by inflating. The side airbags
help to reduce injuries mainly to the driver or front
passenger's chest.
The side airbag on the passenger seat is activated even with
no passenger in the front seat.
Be sure to wear your seat belt.
CAUTION
The side airbags inflate with considerable force. To
avoid potential death or serious injury when they inflate,
the driver and front passenger must:
 Wear their seat belts.
 Remain properly seated with their back upright and
against the seat at all times.
SV16061
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 are operating
properly.
The warning light system monitors the airbag sensor
assembly, front airbag sensors, side airbag sensors, door side
airbag sensors, front seat belt pretensioner assemblies,
inflators, warning light, interconnecting wiring and power
sources. (For details, see ºService reminder indicators and
warning buzzersº on page 38.)

COMFORT ADJUSTMENT
92
SS16042
The SRS airbag system is designed to activate in
response to a severe frontal impact within the shaded area
between the arrows in the illustration.
The SRS airbags will work if the severity of the impact is above
the designed threshold level, comparable to an approximate
25 km/h (15 mph) collision when impacting straight into a fixed
barrier that does not move or deform.
If the severity of the impact is below the above threshold level,
the SRS airbags may not work.
However, this threshold velocity will be considerably higher if
the vehicle strikes an object, such as a parked vehicle or sign
pole, which can move or deform on impact, or if it is involved
in an underride collision (e.g. a collision in which the nose of
the vehicle ºunderridesº, or goes under, the bed of a truck,
etc.).It is possible that in some collisions at the lower zone of airbag
sensor detection and activation the SRS airbags and seat belt
pretensioners will not operate all together.
For the safety of all occupants, always wear your seat belts
properly.SV16019

1Collision from the rear
2Vehicle rollover
The SRS airbags are not designed to inflate if the vehicle
is involved in a rear collision, if it rolls over, or if it is
involved in a low±speed frontal collision.
The side airbags are designed to inflate when the
passenger compartment area suffers a severe impact
from the side.

COMFORT ADJUSTMENT
94
SV16021

1Hitting a curb, edge of pavement or hard material
2Falling into or jumping over a deep hole
3Landing hard or vehicle falling
The SRS airbags may deploy if a serious impact occurs to
the underside of your vehicle. Some examples are shown
in the illustration.
SV16022

1Side airbag modules (airbag and inflator)
2Airbag module for front passenger (airbag and inflator)
3Side airbag sensor assemblies
4Airbag module for driver (airbag and inflator)
5SRS warning light
6Airbag sensor assembly
7Front airbag sensors
The SRS airbag system consists mainly of the above
components, and their locations are shown in the illustration.
The airbag sensor assembly consists of a safing sensor and
airbag sensors.
In a severe frontal impact, the driver and front passenger
airbag sensors detect deceleration and the system triggers the
front airbag inflators. In a severe side impact, the side airbag
sensor triggers the side airbag inflator. Then a chemical
reaction in the inflators quickly fills the airbags with non±toxic
gas to help restrain the forward or lateral motion of the
occupants.

COMFORT ADJUSTMENT
99
SV16066
Do not attach a cup holder or any other device or
object on or around the door. When the side airbag
inflates, the cup holder or any other device or object
will be thrown with great force, or the side airbag may
not activate correctly, resulting in death or serious
injury. Likewise, the driver and front passenger
should not hold things in their arms or on their knees.
Do not use accessories for the seats which cover the
parts where the side airbags inflate. Such
accessories may prevent the side airbags from
activating correctly, causing death or serious injury.
 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,
front passenger airbag cover, front seats or airbag
sensor assembly. Doing any of these may cause
sudden SRS airbag inflation or disable the system,
which could result in death or serious injury.
 Do not modify or replace the seats or upholstery of
the front seats with side airbags. Such changes may
disable the system or cause the side airbags to inflate
accidentally, resulting in death or serious injury.
Consult your Lexus dealer if you consider
modifications of this kind.
Failure to follow these instructions can result in death
or serious injury.