1991 LEXUS SC400 wire pin out

3. Grease should not be applied to the steering wheel pad andthe pad should not be cleaned with detergents of any kind.
4. Store the steering wheel pad where the ambient temperature remains below 93
C (200
F), without high humidity and
away from electrical noise.
5. When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) under the steering
column near the combination switch connector before
starting work.
6. When disposing of a vehicle or the steering wheel pad alone, the airbag should be deployed using an SST
before disposal (See page AB±91). Perform the
operation in a place away from electrical noise.
CENTER AIRBAG SENSOR ASSEMBLY
The connector to the center airbag sensor assembly should be
connected or disconnected with the sensor mounted on the floor.
If the connector is connected or disconnected while the center air-
bag sensor assembly is not mounted to the floor, it could cause un-
desired ignition of the airbag system.
WIRE HARNESS AND CONNECTOR
The airbag system's wire harness is integrated with the cowl wire
harness assembly. The wires for the airbag wire harness are en-
cased in a yellow corrugated tube. All the connectors for the sys-
tem are also a standard yellow color. If the airbag system wire har-
ness becomes disconnected or the connector becomes broken
due to an accident, etc., repair or replace it as shown on page
AB±22 .
±
INTRODUCTION Precautions for Vehicles Equipped with SRS AirbagIN±11
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3. Grease should not be applied to the steering wheel pad and the pad should not b\
e cleaned with detergents
of any kind.
4. Store the steering wheel pad where the ambient temperature remains below 93 °C (200 °F), without high
humidity and away from electrical noise.
5. When using electric welding, first disconnect the airbag connector (yellow \
color and 2 pins) under the steering column near the combination switch connector before starting work.
6. When disposing of a vehicle or the steering wheel pad alone, the airbag shou\
ld be deployed using an SST before disposal (See page AB±91). Perform the operation in a place away from electrical noise.
CENTER AIRBAG SENSOR ASSEMBLY
The connector of the center airbag sensor assembly should be connected or d\
isconnected with the sensor
mounted on the floor. It the connector is connected or disconnected while the center airbag \
sensor assem-
bly is not mounted to the floor, it could cause undesired ignition of the airbag system.
WIRE HARNESS AND CONNECTOR
The airbag system wire harness is integrated with the cowl wire harness ass\
embly. The wires for the airbag
wire harness are encased in a yellow corrugated tube. All the connectors\
for the system are also a standard
yellow color. If the airbag system wire harness becomes disconnected or the connecto\
r becomes broken
due to an accident, etc., repair or replace it as shown on page AB±20.
AB±4
SRS AIRBAG
± General Description
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(e) Pull the wheel pad out from the steering wheel anddisconnect the airbag connector.
NOTICE: When removing the wheel pad, take care not to
pull the airbag wire harness.
CAUTION:
wWhen storing the wheel pad, keep the upper surface of
the pad facing upward (See pages AB±3, 4).
wNever disassemble the wheel pad.
2. REMOVE STEERING WHEEL
(a) Disconnect the connector.
(b) Remove the set nut.
(c) Place matchmarks on the steering wheel and mainshaft.
(d) Using SST, remove the steering wheel.
SST 09213±31021
3. REMOVE AND INSTALL SPIRAL CABLE FROM/TO COMBINATION SWITCH (See page BE±41)
NOTICE: Do not disassemble the spiral cable or apply oil
to it.
4. CENTER SPIRAL CABLE (a) Check that the front wheels are facing straight ahead.
(b) Turn the spiral cable counterclockwise by hand until it
becomes harder to turn the cable.
(c) Then rotate the spiral cable clockwise about 3 turns to align the red mark.
HINT: The spiral cable will rotate about 3 turns to either left
or right of the center.
5. INSTALL STEERING WHEEL (a) Align matchmarks on the steering wheel and main shaft,
and install the steering wheel to the main shaft.
(b) Install and torque the set nut.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(c) Connect the connector.
6. INSTALL STEERING WHEEL PAD (a) Connect the airbag connector.
(b) I n s t a l l t h e w heel pad after confirming that the
circumference groove of the torx screws is caught on the
screw case.
(c) Using a torx wrench, tighten the four screws.
Torque: 7.4 N Vm (75 kgf Vcm, 65 in. Vlbf)
NOTICE:
wMake sure the wheel pad is installed to the specified
torque.
wIf the wheel pad has been dropped, or there are cracks,
dents or other defects in the case or connector, replace
the wheel pad with a new one.
wWhen installing the wheel pad, take care that the wirings
do not interfere with other parts and are not pinched
between other parts.
7. CHECK STEERING WHEEL CENTER POINT AB±15
SRS AIRBAG
± Removal and Installation of Component Parts
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3. PROTECT JOINED SECTIONWrap silicon tape around the joins to protect them from water.
HINT:
wBefore starting the operation, thoroughly wipe dirt and
grease off the sections to be joined.
wIf the adhesive surfaces of two tapes come in contact
they will stick together and will not come apart, so do not
remove the backing film except when using the tape.
wDo not let oil and dust, etc. get on the tape surface.
(a) Ready about 100 mm (3.94 in.) of silicon tape (Part No.
08231±00045) and peel off the film.
(b) Stretch the silicon tape until its width is reduced by half.
(c) About 10 mm (0.39 in.) from the end of the pressure±contact sleeve, wrap the silicon tape around
the sleeve three or more times while stretching the tape.
(d) Wrap the remaining part of sleeve with half of the tape overlapping at each turn.
(e) Firmly wrap the tape two times or more about 10 mm (0.39 in.) from the other end of the pressure±contact
sleeve, then wrap the tape back towards the start again
and firmly finish winding the tape around the center of
the sleeve.
(f) Fix the corrugated tube to the cabtire cable using silicon tape.
(g) After applying the silicon tape, apply vinyl tape on the corrugated tube of repair wire side over to the
corrugated tube of vehicle wire harness side.
AB±22
SRS AIRBAG
± Replacement of Repair Wire for Front Airbag Sensor
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(g) Connect the lead wire to terminal C, and install the nut.
PERFORMANCE TEST OF STARTER
NOTICE: These tests must be performed within 3 to 5 se-
conds to avoid burning out the coil.
1. PERFORM PULL±IN TEST (a) Disconnect the field coil lead wire from terminal C.
(b) C onnect battery to the magnetic switch as shown.
Check that the pinion gear moves outward.
If the pinion gear does not move, replace the magnetic
switch.
2. PERFORM HOLD±IN TEST While connected as above with the pinion gear out, discon-
nect the negative (±) lead from terminal C.
Check that the pinion gear remains out.
If the pinion gear returns inward, replace the magnetic switch.
3. INSPECT PLUNGER RETURN Disconnect the negative (+) lead from the switch body. Check
that the pinion gear returns inward.
If the pinion gear does not return, replace the magnetic
switch.
4. PERFORM NO±LOAD PERFORMANCE TEST (a) Connect battery and ammeter to the starter as shown.
(b) Check that the starter rotates smoothly and steadily with
the pinion gear moving out.
Check the reading on the ammeter.
Standard amperage: 120 A or less at 11.5 V
ST±24±
STARTING SYSTEM Starter
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(g) Connect the lead wire to terminal C, and install the nut.
PERFORMANCE TEST OF STARTER
NOTICE: These tests must be performed within 3 to 5 se-
conds to avoid burning out the coil.
1. PERFORM PULL±IN TEST (a) Disconnect the field coil lead wire from terminal C.
(b) C onnect battery to the magnetic switch as shown.
Check that the pinion gear moves outward.
If the pinion gear does not move, replace the magnetic
switch.
2. PERFORM HOLD±IN TEST While connected as above with the pinion gear out, discon-
nect the negative (±) lead from terminal C.
Check that the pinion gear remains out.
If the pinion gear returns inward, replace the magnetic switch.
3. INSPECT PLUNGER RETURN Disconnect the negative (+) lead from the switch body. Check
that the pinion gear returns inward.
If the pinion gear does not return, replace the magnetic
switch.
4. PERFORM NO±LOAD PERFORMANCE TEST (a) Connect battery and ammeter to the starter as shown.
(b) Check that the starter rotates smoothly and steadily with
the pinion gear moving out.
Check the reading on the ammeter.
Standard amperage: 120 A or less at 11.5 V
ST±24±
STARTING SYSTEM Starter
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5. REMOVE GLOVE COMPARTMENT DOOR LOCKMOUNTING BRACKET
Remove the 2 screws, disconnect the door lock mounting
bracket.
(a) Remove the 3 screws, 2 nuts and bolt.
6. REMOVE FRONT PASSENGER AIRBAG ASSEMBLY
(b) Pull out the front pass enger airbag assembly from the
instrument panel.
NOTICE: When removing the front passenger airbag as-
sembly, take care not to pull the airbag wire harness.
CAUTION:
w When storing the front passenger airbag assembly, keep
the upper surface of the front passenger airbag assembly
facing upward.
w Never disassemble the front passenger airbag assembly.
7. INSTALL FRONT PASSENGER AIRBAG ASSEMBLY
(a) Install and torque the 2 nuts and the bolt.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(b) Install the 3 screws.
NOTICE:
w Make sure the front passenger airbag assembly is
installed to the specified torque.
w If the front passenger airbag assembly has been
dropped, or there are cracks, dents or other defects in the
case or connector, replace the front passenger airbag
assembly with a new one.
w When installing the front passenger airbag assembly,
take care that the wiring do not interfere with other parts
and are not pinched between other parts.
RS±32±
SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLY
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(b) Move the SST to at least 10 m (33 ft) from the front of thevehicle.
(c) Close all the doors and windows of the vehicle. NOTICE: Take care not change the SST wire harness.
(d) Connect the SST red clip to the battery positive (+) terminal and the black clip to the battery negative (±) terminal.
5. DEPLOY AIRBAG
(a) Confirm that no±one is inside the vehicle or within 10 m (33ft) of the vehicle.
(b) Press the SST activation switch and deploy the airbag. HINT: The airbag deploys simultaneously as the LED of the
SST activation switch lights up.
6. DISPOSAL OF FRONT PASSENGER AIRBAG ASSEMBLY
NOTICE:
w The front passenger airbag assembly is very out not
when the airbag is deployed, so leave it alone for at least
30 minutes after deployment.
w Use gloves and safety glasses when handling a front
passenger airbag assembly with deployed airbag.
w Do not apply water, etc., to a front passenger airbag
assembly with deployed airbag.
w Always wash your hands with water after completing the
operation.
When scrapping a vehicle, deploy the airbag and scrap the
vehicle with the front passenger airbag assembly still
installed.
RS±36
±
SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLY
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