ect LEXUS SC300 1991 Service Repair Manual

19. INSTALL CONNECTOR BRACKET
Torque: 4.9 NVm (50 kgf Vcm, 43 in. Vlbf)
20. INSTALL PROTECTOR
21. INSTALL TURN SIGNAL BRACKET
Install the turn signal bracket so that its upper surface is par-
allel with upper surface of the capsule of the breakaway
bracket.
22. INSTALL UPPER BRACKET
(a) Install the upper bracket with 2 new tapered±head bolts.
(b) Tighten the 2 tapered±head bolts until the bolt heads break off.
23. INSTALL LOWER DUST COVER
(a) Using a press, install the dust seal.
±
STEERING STEERING COLUMNSR±25
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SECTIONAL VIEW
SR0EK±02
SR±28±
STEERING STEERING COLUMN
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6. REMOVE TURN SIGNAL BRACKET
7. REMOVE NO. 1 PROTECTOR AND NO. 2 PROTECTOR
8. REMOVE CONNECTOR BRACKET
9. REMOVE 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 2tapered±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 camp.
SR±30
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STEERING STEERING COLUMN
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(c) Remove the upper tube and main shaft from the lower tube.
12. REMOVE TILT STEERING HOUSING SUPPORT
13. 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.
(b) Remove the main shaft from the upper tube.
(c) Remove the spring, thrust collar and bearing.
STEERING COLUMN INSPECTION AND
REPLACEMENT
SR0EM±03
1. INSPECT KEY CYLINDER Check that the steering lock mechanism operates properly.
SR±32
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2. IF NECESSARY, REPLACE KEY CYLINDER
(a) Place the ignition key at the ACC position.
(b) Push down the stop pin with a thin rod, and pull out the keycylinder.
(d) Install a new key cylinder. HINT: Make sure the ignition key is at the ACC position.
3. INSPECT UPPER BEARING Check the upper bearing rotation condition and check for ab-
normal noise.
If the bearing is worn or damaged, replace the column upper
tube.
4. IF NECESSARY, ADJUST TELESCOPIC ADJUSTING SCREWS
(a) Using SST, remove the lock nuts.
SST 09617±14010
(b) Using SST, tighten the adjusting screws. SST 09923±00010
Torque: 6.9 N Vm (70 kgf Vcm, 64 in. Vlbf)
NOTICE:
w If the adjusting screw is tightened higher than the
specified torque, the telescopic mechanism may
malfunction. Conversely, if the torque applied is too low,
rattling may develop in the column, so the specified
torque should always be applied.
w When the adjusting screw and conical springs have been
removed, replace the conical springs facing in the
direction shown in the illustration.
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STEERING STEERING COLUMNSR±33
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6. INSTALL UPPER BRACKET
(a) Install the upper bracket with 2 new tapered±head bolts.
(b) Tighten the tapered±head bolts until the bolt heads break off.
7. INSTALL CONNECTOR BRACKET
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
8. INSTALL NO. 1 PROTECTOR AND NO. 2 PROTECTOR
9. INSTALL TURN SIGNAL BRACKET
Install the turn signal bracket so that its upper surface is par-
allel with upper surface of the capsule of the breakaway
bracket.
10. INSTALL TILT AND TELESCOPIC POSITION SENSORS
SR±36
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STEERING STEERING COLUMN
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ELECTRONIC CONTROL SYSTEM
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STEERING STEERING COLUMNSR±39
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DESCRIPTION
By operating the driving position memory and return switch the driver's seat, steering wheel and outer mir-
ror are moved to their respective memorized positions.
 

Parts Name\
 
\

\
Function 




Tilt & Telescopic ECU
\
 
\


\

\

Control the manual operation, return operation and memory and return ope\
ration for tilt
and telescopic of steering wheel.
 Auto Set Switch\
 \
This switch is a main switch for the away operation of tilt and telescop\
ic.
 




Manual Switch\
 
\


\

\

This switch is an operation switch to operate tilt and telescopic manual\
ly. When one of tilt
up, tilt down, telescopic Extension and telescopic Contraction is operat\
ed, steering wheel
will be able to set on the optional position within the extent of operat\
ing.
 


Driving Position
Memory and
Return Switch\
 
\

\

Operating this switch makes return operation that driver seat steering w\
heel and outer mirror
are set on the memorized position working together power seat and outer \
mirror.
 

Position Sensor
\
 
\

\
Tilt position sensor detect an amount of tilt and input it to ECU.
Telescopic position sensor detect an amount of slide and input it to ECU.\
 

Motor
\
 
\

\
There is a tilt motor and telescopic motor respectively. These are operated by a signal from
the ECU.
SR±40±
STEERING STEERING COLUMN
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HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.\

CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet for reference, obtain as much detail as possible about
the problem.
 PROBLEM SYMPTOM CONFIRMATION,  SYMPTOM SIMULATION
Confirm the problem symptoms. If the problem does not reappear, be sure to simulate the problem, using
the ªProblem Simulation Methodsº.
 MATRIX CHART OF PROBLEM SYMPTOMS
Confirm the order of inspection for each applicable problem symptom on t\
he matrix chart after first fully
confirming the scope of the problem symptoms. For example, if the tilt operation i\
s not working, check
whether the tilt is not working in manual, auto and return, and also check if the telescopic, seat or mirror
operation is not working in addition to the tilt operation.
 CIRCUIT INSPECTION
Proceed with diagnosis of each circuit in accordance with the inspection order \
confirmed in . Judge
whether the cause of the problem is in the sensor, actuators, wire harness and connectors, or the ECU.
6 REPAIR
After the cause of the problem is located, perform repairs by following the i\
nspection and replacement pro-
cedures in this manual.
7 CONFIRMATION TEST After completing repairs, confirm not only that the malfunction is eliminated,\
but also seat and mirror opera-
tions are normal.
SR±45
SR±52
SR±62 ~ SR±101 IN±26
SR±44
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HINT

If the instruction ªProceed to next circuit inspection shown on matrix chartº is given in the flo\
w chart
for each circuit, proceed to the circuit with the next highest number in th\
e table to continue the check.

If the trouble still reappears even through there are no abnormalities i\
n any of the other circuits, then
check and replace the Tilt & Telescopic ECU as the last step.
SR±76
SR±76
SR±80 SR±84
SR±88 SR±90
SR±92
SR±94
SR±96
SR±98
SR±100
IN±38
±
STEERING STEERING COLUMNSR±53
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