Page 2673 of 3000
STEERING COLUMN – STEERING COLUMN ASSEMBLYSR–9
SR
(c) Disengage the secondary locking device.
(d) Using a screwdriver, disengage the locking lug of
terminals 1 and 2, and pull the terminals out from
the rear side of the un-lock warning switch
assembly.
7. REMOVE KEY INTER LOCK SOLENOID
(a) Remove the 2 screws and solenoid from the
steering column bracket assembly.
8. REMOVE IGNITION OR STARTER SWITCH
ASSEMBLY
(a) Remove the 2 screws and ignition or starter switch
assembly from the steering column bracket
assembly UPR.
C083844
Page 2674 of 3000

SR–10STEERING COLUMN – STEERING COLUMN ASSEMBLY
SR
REASSEMBLY
1. INSTALL IGNITION OR STARTER SWITCH
ASSEMBLY
(a) Install the ignition or starter switch assembly to the
steering column bracket assembly UPR with the 2
screws.
2. INSTALL KEY INTER LOCK SOLENOID
(a) Install the solenoid to the steering column bracket
assembly with the 2 screws.
3. INSTALL UN-LOCK WARNING SWITCH ASSEMBLY
(a) Install the un-lock warning switch assembly.
(b) Connect terminals 1 and 2 of the un-lock warning
switch assembly connector.
(c) Connect the un-lock warning switch assembly
connector to the ignition or starter switch assembly.
4. INSTALL IGNITION SWITCH LOCK CYLINDER
ASSEMBLY
(a) Make sure that the ignition switch lock cylinder
assembly is in the ACC position.
(b) Install the ignition switch lock cylinder assembly.
5. INSTALL STEERING LOCK OPERATION
(a) Check that the steering lock mechanism is activated
when removing the key.
(b) Check that the steering lock mechanism is
deactivated when inserting the key and turning it to
the ACC position.
6. INSTALL STEERING COLUMN BRACKET ASSEMBLY
UPPER
(a) Temporarily install the steering column upper w/
switch bracket assembly and steering column upper
clamp with 2 new tapered-head bolts.
(b) Tighten the 2 tapered-head bolts until the bolt heads
break off.
7. INSTALL KEY CYLINDER LIGHT ASSEMBLY (w/o
Engine Immobiliser System)
8. INSTALL TRANSPONDER KEY AMPLIFIER (w/
Engine Immobiliser System)
(a) Align the transponder key amplifier with the
installation position of the upper bracket with the
amplifier inclined.
(b) Push the transponder key amplifier up and connect
it to the upper bracket.
NOTICE:
Take care not to push the amplifier up with
excessive force to prevent it from being
damaged.
C083845
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Page 2675 of 3000

STEERING COLUMN – STEERING COLUMN ASSEMBLYSR–11
SR
9. INSTALL STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Align the matchmarks on the steering intermediate
shaft assembly and main shaft.
(b) Temporarily install the steering intermediate shaft
assembly with the bolt.
Torque: 36 N*m (370 kgf*cm, 27 ft.*lbf)
INSTALLATION
1. INSTALL STEERING COLUMN ASSEMBLY
(a) Install the steering column assembly with the 3
bolts.
Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf)
(b) Connect the connectors.
(c) Connect the wire harness clamps to the steering
column tube.
2. CONNECT STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Align the matchmarks on the intermediate shaft
assembly and steering gear assembly.
(b) Install the steering intermediate shaft assembly with
the bolt.
Torque: 36 N*m (370 kgf*cm, 27 ft.*lbf)
(c) Install the dust cover to the hole cover. Check that
the 3 clips of the dust cover are securely fitted into
the groove on the hole cover.
3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
4. INSTALL SPIRAL CABLE SUB-ASSEMBLY (See page
RS-434)
5. INSTALL STEERING COLUMN COVER
6. CENTER SPIRAL CABLE (See page RS-435)
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Page 2676 of 3000
SR–12STEERING COLUMN – STEERING COLUMN ASSEMBLY
SR
7. INSTALL STEERING WHEEL ASSEMBLY
(a) Align the matchmarks on the steering wheel
assembly and steering main shaft assembly.
(b) Install the steering wheel assembly set nut.
Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf)
(c) Connect the connector.
8. INSPECT STEERING WHEEL CENTER POINT
9. INSPECT HORN BUTTON ASSEMBLY (See page RS-
425)
10. INSTALL HORN BUTTON ASSEMBLY (See page RS-
424)
11. INSTALL STEERING WHEEL COVER LOWER NO.3
(See page RS-425)
12. INSTALL STEERING WHEEL COVER LOWER NO.2
(See page RS-425)
13. CONNECT BATTERY NEGATIVE TERMINAL
14. INSPECT SRS WARNING LIGHT (See page RS-436)
Page 2677 of 3000
STEERING COLUMN – STEERING SYSTEMSR–1
SR
STEERING SYSTEM
PRECAUTION
1. HANDLING PRECAUTIONS ON STEERING SYSTEM
(a) Be careful to replace the parts properly because
they could affect the performance of the steering
system and result in a driving hazard.
2. HANDLING PRECAUTIONS ON SRS AIRBAG
SYSTEM
(a) The SIENNA is equipped with SRS (Supplemental
Restraint System) such as the driver airbag and
front passenger airbag. Failure to carry out service
operation in correct sequence could cause the SRS
to unexpectedly deploy during servicing, possibly
leading to a serious accident. Before servicing
(including removal or installation of parts, inspection
or replacement), be sure to read the precautionary
notice for the supplemental restraint system (See
page RS-1).
Page 2678 of 3000

SR–2STEERING COLUMN – STEERING SYSTEM
SR
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the
problem. Likely causes of the problem are indicated in
descending order. Check each suspected area in order.
Repair or replace the faulty parts or perform adjustments as
necessary.
STEERING SYSTEM
ON-VEHICLE INSPECTION
1. CHECK STEERING WHEEL FREEPLAY
(a) Stop the vehicle and face the tires straight ahead.
(b) Rock the steering wheel gently up and down with
your hand, check the steering wheel freeplay.
Maximum freeplay:
30 mm (1.18 in.)
Symptom Suspected Area See page
Hard steeringTires (Improperly inflated)TW-2
Power steering fluid level (Low)PS-2
Drive belt (Loose) -
Front wheel alignment (Incorrect)SP-4
Steering system joints (Worn) -
Suspension arm ball joints (Worn)SP-24
Steering column (Binding)SR-6
Power steering vane pumpPS-9
Power steering gearPS-24
Poor returnTires (Improperly inflated)TW-2
Front wheel alignment (Incorrect)SP-4
Steering column (Binding) -
Power steering gearPS-24
Excessive playSteering system joints (Worn) -
Suspension arm ball joints (Worn)SP-24
Intermediate shaft, Sliding yoke (Worn) -
Front wheel bearing (Worn)AH-5
Power steering gearPS-24
Abnormal noisePower steering fluid level (Low)PS-2
Steering system joints (Worn) -
Power steering vane pumpPS-9
Power steering gearPS-24
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Page 2679 of 3000

SR–6STEERING COLUMN – STEERING COLUMN ASSEMBLY
SR
REMOVAL
1. PRECAUTION
HINT:
See page RS-1
2. DISCONNECT BATTERY NEGATIVE TERMINAL
Wait for 90 seconds after disconnecting the battery
terminal to prevent the airbag working.
3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
4. REMOVE STEERING WHEEL COVER LOWER NO.2
(See page RS-424)
5. REMOVE STEERING WHEEL COVER LOWER NO.3
(See page RS-424)
6. REMOVE HORN BUTTON ASSEMBLY (See page RS-
424)
7. REMOVE STEERING WHEEL ASSEMBLY
(a) Remove the steering wheel assembly set nut.
(b) Put matchmarks on the steering wheel assembly
and main shaft assembly.
(c) Using SST, remove the steering wheel assembly.
SST 09950-50013 (09951-05010, 09952-05010,
09953-05020, 09954-05021)
8. REMOVE STEERING COLUMN COVER
(a) Remove the 2 screws and steering column cover.
9. REMOVE SPIRAL CABLE SUB-ASSEMBLY (See page
RS-434)
10. REMOVE HEADLIGHT DIMMER SWITCH ASSEMBLY
(See page LI-102)
11. REMOVE WINDSHIELD WIPER SWITCH ASSEMBLY
(See page WW-17)
12. REMOVE FRONT DOOR SCUFF PLATE LH
13. REMOVE COWL SIDE TRIM BOARD LH
14. REMOVE INSTRUMENT PANEL FINISH PANEL SUB-
ASSEMBLY LOWER LH (See page IP-6)
15. REMOVE INSTRUMENT PANEL SAFETY PAD
INSERT SUB-ASSEMBLY NO.1 (See page IP-6)
16. REMOVE HEATER TO FOOT DUCT NO.3
(a) Disengage the 3 claws and remove the sir duct No.
3.
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Page 2680 of 3000
STEERING COLUMN – STEERING COLUMN ASSEMBLYSR–7
SR
17. SEPARATE STEERING INTERMEDIATE SHAFT
ASSEMBLY
(a) Loosen the bolt.
(b) Release the 3 clips and separate the dust cover.
(c) Align the matchmarks on the steering intermediate
shaft assembly and steering gear assembly.
(d) Remove the bolt and separate the steering
intermediate shaft assembly.
18. REMOVE STEERING COLUMN ASSEMBLY
(a) Disconnect the connectors and wire harness
clamps.
(b) Remove the 3 bolts and steering column assembly
from the instrument panel reinforcement assembly.
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