LEXUS SC400 1991 Service Repair Manual

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MAIN POINTS OF REMOVAL AND
INSTALLATION
NOTICE:
wIf the SRS (Supplemental Restraint System) connector is
disconnected with the ignition switch at ON or ACC,
diagnostic trouble codes will be recorded.
w Never use SRS parts from another vehicle. When
replacing parts, replace with new parts.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: W ork must be started after 90 seconds from the time
the ignition switch is turned to the ªLOCKº position and the
negative (±) terminal cable is disconnected from the battery.
(See RS section)
2. REMOVE STEERING WHEEL PAD
(a) Place the front wheels facing straight ahead.
(b) Remove the No.2 and No.3 covers.
(c) Using a torx wrench, loosen the 4 torx screws. Torx wrench: T30 (Part No. 09042±00010 or locally manufac-
tured tool)
HINT: Loosen the 4 screws until the groove along the screw
circumference catches on the screw case.
(d) P u l l t h e w heel pad out from the steering wheel and
disconnect the Airbag connector.
NOTICE: When removing the wheel pad, take care not to pull
the Airbag wire harness.
CAUTION:
w When storing the wheel pad, keep the upper surface of
the pad facing upward.
w Never disassemble the wheel pad.
3. REMOVE STEERING WHEEL
(a) Disconnect the connector.
(b) Remove the steering wheel set nut.
(c) Place matchmarks on the steering wheel and main shaft.
(d) Using SST, remove the wheel.
SC400:
SST 09213±31021
SC300:
SST 09609±20011
SR±10
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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 wheel to the shaft.
(b) Tighten the wheel 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) Install the pad after confirming that the circumference groove
of the torx screws is caught on the screw case.
(c) Using a torx wrench, tighten the 4 torx screws.
Torque: 7.4 N Vm (75 kgf Vcm, 65 in. Vlbf)
NOTICE:
w Make sure the wheel pad is installed to the specified
torque.
w If 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.
w When installing the wheel pad, take care that the wiring
does not interfere with other parts and is not pinched
between other parts.
7. CHECK STEERING WHEEL CENTER POINT
8. CONNECT NEGATIVE (±) TERMINAL CABLE TO
BATTERY
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MANUAL TILT AND MANUAL
TELESCOPIC STEERING COLUMN
SR0EP±07
(SC300)
COMPONENTS
SR±12±
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SECTIONAL VIEW
SR0EQ±02
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STEERING COLUMN DISASSEMBLY
SR0ER±03
NOTICE: When placing the breakaway bracket in a vise
during disassembly or assembly of the steering column,
use aluminum, etc. to prevent scratches to the tip of the
capsule.
1. REMOVE IGNITION KEY CYLINDER ILLUMINATION
2. REMOVE SLIDING YOKE Place matchmarks on the sliding yoke and main shaft.
3. REMOVE LOWER DUST COVER
(a) Remove the clip and dust cover.
(b) Using a screwdriver, remove the dust seal.
4. REMOVE COLUMN UPPER BRACKET
(a) U s i n g a c e n t e r i n g p u n c h , m a r k t h e c e n t e r o f t h e 2 tapered±head bolts.
(b) U s i n g a 4 ± 5 m m ( 0 . 16±0.20 in.) drill, drill into the 2
tapered±head bolts.
(c) Using a screw extractor, remove the 2 tapered±head bolts.
(d) Remove the bracket and column upper clamp.
SR±14
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5. REMOVE TURN SIGNAL BRACKET
6. REMOVE PROTECTOR
7. REMOVE CONNECTOR BRACKET
8. REMOVE TELESCOPIC LEVER SERRATIONATTACHMENT
Remove the nut and the serration attachment.
9. REMOVE TELESCOPIC LEVER
(a) Remove the bolt, collar, lever and washer.
(b) Remove the ball and compression spring.
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10. REMOVE TELESCOPIC LEVER LOCK BOLTInstall a double nut on the lock bolt, then remove the lock bolt.
11. REMOVE BREAKAWAY BRACKET
(a) Remove the steering column tube stopper bolt.
(b) Using snap ring pliers, remove the snap ring from the main shaft.
(c) Remove the breakaway bracket from the main shaft. Be careful the spline part of the main shaft does not come
loose.
12. REMOVE 2 LOCK WEDGES FROM BREAKAWAY BRACKET
13. REMOVE STEERING SHAFT THRUST STOPPER
14. REMOVE COMPRESSION SPRING
(a) Using a torx wrench, remove the bolt and spring. Torx wrench: T30 (Part No. 09042±00010 or locally manufac-
tured tool)
(b) Remove the 2 bushings from the spring.
SR±16
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15. REMOVE 3 TENSION SPRINGS
16. REMOVE TILT LEVER RETAINERS
(a) Using a hexagon wrench to hold the tilt memory bolt, removethe nut.
(b) Remove the nut and washer.
(c) Pull out the bolt.
(d) Remove the 2 E±rings and the spacer from the tilt lever lock shaft.
(e) Remove the 2 nuts from the tilt steering bolts.
(f) Remove the 2 tilt lever retainers.
(g) Remove the collar from the tilt memory bolt.
17. REMOVE RH TILT PAWL, PAWL STO PPER AND TILT
LEVER
18. REMOVE LH TILT PAWL, PAWL STOPPER, TILT SUB LEVER, TILT LEVER ASSEMBLY AND TILT LEVER LOCK
SHAFT
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19. REMOVE UPPER COLUMN TUBE
(a) Set SST, the nut (10 mm diameter, 1.25 mm pitch), platewasher (36 mm outer diameter) and bolt (10 mm diameter,
1.25 mm pitch, 50 mm length), as shown.
And then remove the 2 tilt steering bolts.
SST 09910±00015 (09911±00011, 09912±00010)
(Reference)
Nut 90170±10004
Plate washer 90201±10201
Bolt 91111±51050
(b) Remove the upper column tube from the lower column tube.
20. REMOVE TILT MEMORY BOLT Using a hexagon wrench, remove the tilt memory bolt and
square nut.
21. REMOVE MAIN SHAFT ASSEMBLY
(a) Secure the column upper tube in a vise. NOTICE: Do not tighten the vise too tight.
(b) Using SST, compress the compression spring. SST 09950±20017 (09956±00010)
(c) Using snap ring pliers, remove the snap ring.
SR±18
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