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 SUBASSEMBLY 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.
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.
Steering Column Assembly
DisassemblyCamshaft Position "B" - Timing Over
HINT:
If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve
Timing) system.
DESCRIPTION
Refer to DTC P0013 (See page ES-87).
MONITOR DESCRIPTION
DTC P0014 and P0024
The ECM compares current valve timing with target valve timing, while the
engine is running a ...
Disassembly
1. REMOVE CYLINDER BOOT
(a) Using a screwdriver, remove the set ring and
cylinder boot.
2. REMOVE REAR DISC BRAKE PISTON
(a) Place a shop rug, between the rear disc brake
piston and the disc brake cylinder.
(b) Use compressed air to remove the rear disc brake
piston from the disc brak ...
General information
A large number of ECU controlled systems are used in the
SIENNA. In general, ECU controlled systems are considered
to be very intricate, requiring a high level of technical
knowledge to troubleshoot. However, most problem checking
procedures only involve inspecting the ECU controlled
system's c ...