1991 LEXUS SC400 wheel bolts

5. Non±reusable parts(a) Always replace cotter pins, gaskets, O±rings and oilseals etc. with new ones.
(b) Non±reusable parts are indicated in the component
illustrations by the º º symbol.
6. Precoated parts Precoated parts are bolts and nuts, etc. that are coated with
a seal lock adhesive at the factory.
(a) If a precoated part is retightened, loosened or causedto move in any way, it must be recoated with the
specified adhesive.
(b) Recoating of precoated parts
(1) Clean off the old adhesive from the bolt, nut or threads.
(2) Dry with compressed air.
(3) Apply the specified seal lock adhesive to the bolt or nut threads.
(c) P re co a te d pa rts are in d ica te d in th e co m ponent
illustrations by the º
º symbol.
7. When necessary, use a sealer on gaskets to prevent leaks.
8. Carefully observe all specifications for bolt tightening
torques. Always use a torque wrench.
9. Use of special service tools (SST) and special service materials (SSM) may be required, depending on the nature
of the repair. Be sure to use SST and SSM where specified
and follow the proper work procedure. A list of SST and SSM
can be found in the preparation part at the front of each
section in this manual.
10. When replacing fuses, be sure the new fuse has the correct
amperage rating. DO NOT exceed the rating or use one with
a lower rating.
11. Care must be taken when jacking up and supporting the vehicle. Be sure to lift and support the vehicle at the proper
locations (See page IN±33).
(a) If the vehicle is to be jacked up only at the front or rear end, be sure to block the wheels at the opposite end in
order to ensure safety.
(b) After the vehicle is jacked up, be sure to support it on
stands. It is extremely dangerous to do any work on a
vehicle raised on a jack alone, even for a small job that
can be finished quickly.
±
INTRODUCTION General Repair InstructionsIN±5
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FRONT AIRBAG SENSOR
1. Never reuse the front airbag sensors involved in a collisionwhen the airbag has deployed. (Replace both the left and
right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated. When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag sensor is equipped with an electrical connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If the
connector is not securely locked, a malfunction code will be
detected by the diagnosis system (See page AB±10).
SPIRAL CABLE (IN COMBINATION
SWITCH)
The steering wheel must be fitted correctly to the steering column
with the spiral cable at the neutral position; otherwise cable dis-
connection and other troubles may result. Refer to page AB±15
of this manual concerning correct steering wheel installation.
STEERING WHEEL PAD (WITH AIRBAG)
1. When removing the steering wheel pad or handling a new steering wheel pad, it 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. And do not store a steer-
ing wheel pad on top of another one. (Storing the pad with its
metallic surface up may lead to a serious accident if the air-
bag inflates for some reason.)
2. Never measure the resistance of the airbag squib. (This
may cause the airbag to deploy, which is very
dangerous.)
IN±10±
INTRODUCTION Precautions for Vehicles Equipped with SRS Airbag
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3.14 X (Diameter)2
4
3. FIX STEERING WHEEL PAD TO DISC WHEEL WITH TIRE(a) Install bolts with washers in the four bolt holes in thesteering wheel pad.
Bolt: L 35.0 mm (1.4 in.) M 6.0 mm
Pitch 1.0 mm
NOTICE: Tighten the bolts by hand until the bolts
become difficult to turn.
Do not tighten the bolts too much.
(b) Using a service±purpose wire harness for vehicle, tie down the steering wheel pad to the disc wheel.
Wire harness: Stripped wire harness section 1.25 mm or
more (0.002 in. or more)
HINT: To calculate the square of the stripped wire harness
section ±
Square =
CAUTION: If a wire harness which is too thin or some oth-
er thing is used to tie down the steering wheel pad, it may
be snapped by the shock when the airbag is deployed,
this is highly dangerous. Always use a wire harness for
vehicle use which is at least 1.25 mm (0.002 in.).
(c) Using 3 wire harnesses, wrap the wire harnesses at least 2 times each around the bolts installed on the left
and right sides of the steering wheel pad.
CAUTION: Tightly wind the wire harness around the bolts
so that there is no slack.
If there is slackness in the wire harness, the steering
wheel pad may come loose due to the shock when the
airbag is deployed, this is highly dangerous.
(d) Face the upper surface of the steering wheel pad upward. Separately tie the left and right sides of the steering
wheel pad to the disc wheel through the hub nut holes.
Position the steering wheel pad connector so that it
hangs downward through a hub hole in the disc wheel.
CAUTION:
wMake sure that the wire harness is tight. It is very
dangerous if looseness in the wire harness results
in the steering wheel pad coming free through the
shock of the airbag deploying.
AB±94
±
SRS AIRBAG Disposal of Steering Wheel Pad (with Aribag)
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FRONT AIRBAG SENSOR
1. Never reuse the front airbag sensors involved in a collisionwhen the airbag has deployed. (Replace both the left and
right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated. When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag sensor is equipped with an electrical connection check mechanism. Be sur\
e to lock this mechanism securely when connecting the connector. If the connector is not securely locked, a malfunction
code will be detected by the diagnosis system (See page AB±7).
SPIRAL CABLE (in COMBINATION SWITCH)
The steering wheel must be fitted correctly to the steering column with the\
spiral cable at the neutral posi-
tion, otherwise cable disconnection and other troubles may result. Refer to pa\
ge AB±17 of this manual con-
cerning correct steering wheel installation.
STEERING WHEEL PAD (with AIRBAG)
1. When removing the steering wheel pad or handling a new steering wheel pad, it 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. And do not store a steering
wheel pad on top of another one. (Storing the pad with its me-
tallic surface up may lead to a serious accident if the airbag
inflates for some reason.)
2. Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is very dangerous.)
AB±3SRS AIRBAG ± General Description
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REMOVAL OF FRONT FENDER
(See page BO±92)
1. REMOVE FRONT BUMPER (See page BO±91)
2. REMOVE FRONT FENDER WHEEL OPENING MOULDING
(See page BO±102)
3. REMOVE FENDER LINER (a) Remove eight screws.
(b) Remove the liner with four clips.
4. REMOVE FRONT FENDER Remove eleven bolts and the fender.
CAUTION: Do not damage or shock the front airbag
sensor at all.
INSTALLATION OF FRONT FENDER
(See page BO±91)
1. INSTALL FRONT FENDER Install eleven bolts and the fender.
BO±92
±
BODY Front Fender
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REMOVAL OF HOOD LOCK CONTROL
(See page BO±24)
1. REMOVE FOLLOWING PARTS: (a) Front bumper
(b) LH front fender wheel opening moulding
(c) LH fender liner
(d) Fender splash shield
(e) Hood release lever
2. REMOVE HOOD LOCK (a) Remove two bolts, the nut and the hood lock.
(b) Disconnect the link from the lock.
3. REMOVE HOOD LOCK CONTROL CABLE (a) Disconnect the cable from clamps.
(b) Using the screwdriver, pry out the cable stopper fromgrommet.
HINT: Do not damage the grommet with the screwdriver.
±
BODY Hood (Hood Lock Control)BO±25
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(c) Pull the cable from front wheel housing to remove it.
INSTALLATION OF HOOD LOCK
CONTROL
(See page BO±24)
1. BEFORE INSTALLING PARTS, COAT LOCK WITH MP GREASE
Apply MP grease to the sliding surface of the lock.
2. INSTALL HOOD LOCK CONTROL CABLE (a) Push the rear side cable through the grommet.
(b) Using the screwdriver, push the cable stopper into thegrommet.
HINT: Do not damage the grommet with the screwdriver.
(c) Clamp the cable to the junction block.
(d) Pass the front side cable through the upper radiator
support.
3. INSTALL HOOD RELEASE LEVER
4. INSTALL HOOD LOCK TEMPORARILY
5. CHECK HOOD LOCK CONTROL FOR PROPER OPERATION
After checking for proper operation, tighten the nut and two
bolts to install the lock.
6. INSTALL FOLLOWING PARTS: (a) Hood release lever
(b) Fender splash shield
(c) LH fender liner
(d) LH front fender wheel opening moulding
(e) Front bumper
BO±26
±
BODY Hood (Hood Lock Control)
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Parts Inspection
(Horn Switch)
INSPECTION OF HORN SWITCH
INSPECT HORN SWITCH
(a) Disconnect the negative (±) terminal from the battery.
(b) Remove the left and right covers from the steering wheel.
(c) Using a torx wrench, loosen the four bolts.
(d) Pull up the horn pad and place it on the steering column as shown.
HINT: Do not disconnect the connector from the horn pad.
(e) Disconnect the connector from the slip ring.
(f) Check that there is no continuity between terminal 6 of the
connector and body ground.
(g) Check that there is continuity between terminal 6 of the connector and body ground when the horn contact plate is
pressed against the steering spoke assembly.
If continuity is not as specified, repair or replace the steering
wheel or wire harness as necessary.
(h) Install the horn pad in place and using a torx wrench, tighten the four bolts.
Torque: 7.1 N Vm (72 kgf Vcm, 62 in. Vlbf)
(i) Install the left and right covers.
(j) Connect the negative (±) terminal to the battery.
(Horn)
INSPECTION OF HORN
INSPECT HORN OPERATION
Connect the positive (+) lead from the battery to the terminal
and negative (±) lead to the horn body and check that the
horn blows.
If operation is not as specified, replace the horn.
±
BODY ELECTRICAL SYSTEM HORN SYSTEMBE±263
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