light LEXUS SC400 1991 Service Manual PDF

SRS AIRBAG
(See page AB±2)
The LEXUS SC300 is equipped with an SRS (Supplemental Restraint System)\
airbag.
Failure to carry out service operations in the correct sequence could cause the airbag system to deploy,
possibly leading to a serious accident.
When removal or installation of airbag parts and the yellow wire harness\
and connector for the airbag is
necessary, refer to the precautionary notices in the AB section before performing\
the operation.

Work must be started after 20 seconds or longer from the time the ignition switch is set to the LOCK
position and the negative (±) terminal cable is disconnected from the batte\
ry.
(The airbag system is equipped with a back±up power source so that if wor\
k is started within 20 se-
conds of disconnecting the negative (±) terminal cable of the batte\
ry, the airbag may be deployed.

To avoid erasing the memory of each memory system, never use a back±up power supply from
outside the vehicle.

Before repairs, remove the airbag sensors if shocks are likely to be applied t\
o the sensors during
repaires.

The front airbag sensor set bolt has been anti±rust treated. When the\
sensor is removed, always
replace the set bolt with a new one.

If the front airbag sensors, center airbag sensor or steering wheel pad ha\
ve been dropped, or if there
are cracks, dents or other defects in the case, bracket or connector, replace them with new ones.

Never use airbag parts from another vehicle. When replacing parts, repla\
ce them with new parts.

Do not expose the front airbag sensors, center airbag sensor or steering w\
heel pad directly to hot air
or flames.

The airbag system's wire harness is integrated with the cowl wire harness assembly. The wires for the
airbag wire harness are encased in a yellow corrugated tube. All the connector\
s for the system are
also a standard yellow color. If the airbag system wire harness becomes disconnected or the
connector becomes broken due to an accident, etc., repair or replace it as shown \
on page AB±20.

The steering wheel must be fitted correctly to the steering column with the\
spiral cable at the neutral
position; otherwise, cable disconnection and other troubles may result. \
Refer to page AB±14 of this
manual concerning correct steering wheel installation.

When removing the steering wheel pad or handling a new steering wheel pad, i\
t should be placed with
the pad top surface facing up. In this case, the twin±lock type connector lock lever should be in the
locked state and care should be taken to place it so the connector will not be damaged. (\
Storing the
pad with its metallic surface up may lead to a serious accident if the a\
irbag inflates for some reason.)

Grease should not be applied to the steering wheel pad and the pad should not \
be cleaned with
detergents of any kind.

Store the steering wheel pad where the ambient temperature remains below 93 C (200 F), without
high humidity and away from electrical noise.

Information labels are attached to the periphery of the airbag component\
s. Follow the notices.

When the ignition switch is at ACC or ON and the airbag warning light remains on, the cent\
er airbag
sensor assembly has detected a malfunction code. (See page AB±30).
BO±8
±
BODY General Information
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REMOVAL OF FRONT BUMPER
(See page BO±11)
1. REMOVE FENDER SPLASH SHIELD Remove fourteen screws, a bolt and the shield.
2. REMOVE NO. 2 ENGINE UNDER COVER Remove seven screws, five bolts and the cover.
3. REMOVE HEADLIGHT (Low Beam)
(a) Remove two nuts, a bolt and the headlight.
(b) Disconnect the connectors.
4. REMOVE UPPER BUMPER RETAINER (a) Remove the hood seal.
(b) Remove five screws and the retainer.
5. REMOVE BUMPER COVER ASSY (a) Remove six clips.
BO±12
±
BODY Bumper (Front Bumper)
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(b) Remove four clips.
(c) Remove the clip and ambient temperature sensor.
(d) Remove four nuts.
(e) Remove ten clips.
(f) Remove two bolts.
(g) Disconnect the connectors.
(h) Remove the bumper cover assy.
6. REMOVE REINFORCEMENT Remove six bolts and the reinforcement.
7. REMOVE UPPER REINFORCEMENT Remove eight bolts and the reinforcement.
8. REMOVE HEADLIGHT (High Beam)
(a) Remove two screws, a clip and the headlight.
(b) Disconnect the connector.
±
BODY Bumper (Front Bumper)BO±13
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INSTALLATION OF FRONT BUMPER
(See page BO±11)
INSTALL FRONT BUMPER PARTS BY FOLLOWING RE-
MOVAL SEQUENCE IN REVERSE HINT:
wWhen installing the bumper on the body, be careful
not to damage the serrated part of side bolts.
wAfter installing the headlight, adjust the light aiming.
(See page BE±38).
DISASSEMBLY AND ASSEMBLY OF
FRONT BUMPER
DISASSEMBLY AND ASSEMBLY BY
FOLLOWING PARTS:
(a) Cornering lights
(b) Side turn lights
(c) Bumper energy absorber
(d) Retainers
(e) License bracket
BO±14
±
BODY Bumper (Front Bumper)
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REMOVAL OF REAR BUMPER
(See page BO±15)
1. REMOVE FOLLOWING PARTS:
(See steps 1 to 6 on pages BO±79 to 80)
(a) Floor mat
(b) Door striker cover
(c) Trim rear cover
(d) Trim front cover
(e) LH side cover
(f) RH side cover
2. REMOVE REAR COMBINATION LIGHT (a) Remove four nuts and disconnect the connectors.
(b) Remove the light.
3. REMOVE VENTILATION DUCT Remove three screws and the duct.
4. REMOVE REAR BUMPER COVER
(a) Remove sixteen clips and six nuts.
(b) Remove the cover.
BO±16±
BODY Bumper (Rear Bumper)
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5. REMOVE LICENCE LIGHT AND BUMPER EXTENSION(a) Remove the bumper energy absorber from the bumpercover.
(b) Remove three screws and the light.
(c) Remove the nut and the extension.
6. REMOVE BUMPER REINFORCEMENT Remove six bolts and the reinforcement.
INSTALLATION OF REAR BUMPER
(See page BO±15)
INSTALL REAR BUMPER PARTS BY FOLLOWING
REMOVAL SEQUENCE IN REVERSE
±
BODY Bumper (Rear Bumper)BO±17
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2. ADJUST FRONT DOOR IN LEFT/RIGHT AND VERTICALDIRECTIONS
Loosen the door side hinge bolts to adjust.
3. ADJUST FRONT DOOR LOCK STRIKER (a) Check that the door fit and door lock link ages are
adjusted correctly.
(b) Using a screwdriver, remove the striker cover.
HINT: Tape the screwdriver tip before use.
(c) Adjust the striker position by slightly loosening the striker mounting screws, and hitting the striker with a
hammer. Tighten the striker mounting screws again.
(d) Install the striker cover.
BO±30
±
BODY Front Door (Fitting Adjustments)
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DISASSEMBLY OF FRONT DOOR
(See page BO±31)
1. REMOVE ARMREST BASE PANEL (a) Using the screwdriver, remove the clip.
(b) Pull the panel forward and disconnect the connector.
2. REMOVE DOOR INSIDE HANDLE BEZEL COVER Using the small screwdriver, pry outward the cover.
3. REMOVE DOOR TRIM (a) Remove two caps and eight screws.
(b) Insert the screwdriver between the panel and the trimand remove clips.
HINT: Do not scratch the panel with the screwdriver.
(c) Remove the trim by pulling all of the trim.
(d) Remove the two cables from the door inside handle.
(e) Disconnect the connector from the door curtesy light.
±
BODY Front DoorBO±33
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(f) Remove twelve nuts, the front door trim ornament andthe door inside handle.
(g) Remove eight screws and armrest.
(h) Remove the door courtesy light.
4. REMOVE DOOR SPEAKER GRILLE Using a screwdriver, pry loose two clips and remove the cov-
er.
HINT: Tape the screwdriver tip before use.
5. REMOVE DOOR TRIM UPPER PANEL Remove six screws and pry out the panel.
6. REMOVE FRONT DOOR WEATHERSTRIP While pulling the weatherstrip by hand, remove the nine clips
using a clip remover.
HINT: Do not pull strongly on the weatherstrip as it may
tear.
7. REMOVE OUTSIDE REAR VIEW MIRROR AND SPEAKER
(a) Remove two bolts and the speaker, disconnect the connector.
(b) Remove two bolts and the mirror, disconnect the connector.
BO±34
±
BODY Front Door
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2. INSPECT BRAKE WARNING LIGHT(a) Disconnect the connector from the brake fluid warningswitch.
(b) Release the parking brake pedal.
(c) Connect terminals on the wire harness side of the level warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
(Parking Brake Switch)
REMOVAL AND INSTALLATION OF PARKING
BRAKE SWITCH
1. REMOVE PARKING BRAKE SWITCH
(a) Remove the driver's seat.
(See page BO±58)
(b) Disconnect the connector and remove switch.
2. INSTALL PARKING BRAKE SWITCH For installation follow the removal procedure in reverse.
INSPECTION OF PARKING BRAKE SWITCH
1. INSPECT PARKING BRAKE SWITCH
(a) Check that there is continuity between terminal andswitch body with the switch ON (switch pin released).
(b) Check that there is no continuity between terminal and switch body with the switch OFF (switch pin pushed in.)
If continuity is not as specified, replace the switch or inspect
ground point.
2. INSPECT BRAKE WARNING LIGHT (a) Disconnect the connector from the parking brake switchand brake fluid warning switch.
(b) Ground terminal on the wire harness side connector.
(c) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or inspect
wire harness.
BE±116
±
BODY ELECTRICAL SYSTEM Combination Meter
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