Toyota Sienna Service Manual: System description
1. DESCRIPTION OF POWER REAR NO. 2 SEAT WITH
STOWING FUNCTION
- A power rear no. 2 seat with stowing function has
been adopted for the third-row seats.
- The power rear no. 2 seat with stowing function
electrically stows and returns the seat when the
power folding seat switch is operated.
- This system is adopted for both the left and right
seats. Each system operates independently.
2. FUNCTIONS OF MAIN COMPONENTS
Components |
Function |
Folding Motor
(Cushion Position Sensor) |
The fold seat control ECU provides the voltage that is used to
operate
the folding motor. The folding motor stows and returns the third-row
seat. (A Hall type position sensor is installed in the folding motor to
detect the seat cushion position.) |
Reclining Motor
(Seatback Position Sensor) |
The fold seat control ECU provides the voltage that is used to
operate
the reclining motor. The reclining motor reclines the seatback of the
third-row seat back and forth. (A Hall type position sensor is installed
in the reclining motor to detect the seatback position.) |
Release Actuator |
The fold seat control ECU provides the voltage that releases the
actuator that locks the seat leg. |
Lock Switch |
Turns off when the third-row seat leg is secured to the floor and
sends
a signal to the fold seat control ECU. |
Fold Lock Switch |
Turns off when the third-row seat cushion is stowed and sends a
signal to the fold seat control ECU. |
Power Rear No. 2 Seat Switch |
Sends a seatback angle adjustment signal to the fold seat control
ECU when this switch is operated. The seatback angle is adjusted
based on this signal. |
Fold Seat Switch |
Sends a third-row seat folding-down, stowing, or return operation
signal to the fold seat control ECU when this switch is operated. The
third-row seat is folded down, stowed, or returned to the original
position based on this signal. |
3. SYSTEM OPERATION
- Original State
- Stowed State
- Folded-down State
- Manual Operation (Press and hold the switch)
- Automatic Operation (Press and release the switch)
- Return operation (from the stowed state to the
original state)
- Switch operation
Push the stowing/return switch to the left and
hold it to return the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- If the above conditions are not met, the
indicator on the switch will blink while the
switch is pressed.
- The buzzer will sound twice when the seat
cushion return operation begins.
- After the seat cushion return operation is
complete, the buzzer will sound twice to
indicate that the seatback auto return
operation has begun.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a return operation, the
return operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught
or detects that the motor is locked, the
system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- Stowing operation (from the original state to the
stowed state)
- Switch operation
Push the stowing/return switch to the right and
hold it to stow the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- The buzzer will sound twice when the
seatback folding-down operation begins.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a stowing operation, the
stowing operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught
or detects that the motor is locked, the
system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- The buzzer will sound twice when the
operation is complete.
- Stowing operation (from the folded-down state to
the stowed state)
- Switch operation
Push the stowing/return switch to the right and
hold it to stow the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- The buzzer will sound twice when the seat
cushion stowing operation begins.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a stowing operation, the
stowing operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught,
the system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- The buzzer will sound twice when the
operation is complete.
- Return operation (from the folded-down state to the
original state)
- Switch operation
- Press and release the folding switch.
- Push the stowing/return switch to the left and
release it.
- Press the power rear no. 2 seat switch to
recline the seat back and release it.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
- The seat cushion is secured.
HINT:
- The power rear no. 2 seat switch can be
operated in the cabin to perform the return
operation even while the vehicle is being
driven.
- If any other switch is pressed midway through
a return operation, the return operation will
stop. The buzzer will sound for 10 seconds
and the indicator on the switch will come on.
- If the system detects that an object is caught,
the system will stop the return operation. The
buzzer will sound for 10 seconds and the
indicator on the switch will blink.
- The indicator will go off when normal
operation resumes.
- Folding-down operation (from the original state to
the folded-down state)
- Switch operation
Press and release the folding switch.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
- The seat cushion is secured.
HINT:
- If any switch other than the folding switch is
pressed midway through a folding-down
operation, the folding operation will stop. The
buzzer will sound for 10 seconds and the
indicator on the switch will come on.
- If the system detects that an object is caught,
the system will stop the folding operation. The
buzzer will sound for 10 seconds and the
indicator on the switch will blink.
- The indicator will go off when normal
operation resumes.
- Reclining operation
- Switch operation
Press the power rear no. 2 seat switch.
- Conditions
- The seat cushion is secured.
- The seatback is within the reclining operation
range.
HINT:
The operation will stop when the power rear no.
2 seat switch is released or when the seatback
position reaches either end of the reclining
operation range.
3. SYSTEM OPERATION
- Original State
- Stowed State
- Folded-down State
- Manual Operation (Press and hold the switch)
- Automatic Operation (Press and release the switch)
- Return operation (from the stowed state to the
original state)
- Switch operation
Push the stowing/return switch to the left and
hold it to return the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- If the above conditions are not met, the
indicator on the switch will blink while the
switch is pressed.
- The buzzer will sound twice when the seat
cushion return operation begins.
- After the seat cushion return operation is
complete, the buzzer will sound twice to
indicate that the seatback auto return
operation has begun.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a return operation, the
return operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught
or detects that the motor is locked, the
system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- Stowing operation (from the original state to the
stowed state)
- Switch operation
Push the stowing/return switch to the right and
hold it to stow the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- The buzzer will sound twice when the
seatback folding-down operation begins.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a stowing operation, the
stowing operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught
or detects that the motor is locked, the
system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- The buzzer will sound twice when the
operation is complete.
- Stowing operation (from the folded-down state to
the stowed state)
- Switch operation
Push the stowing/return switch to the right and
hold it to stow the seat.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
HINT:
- The buzzer will sound twice when the seat
cushion stowing operation begins.
- If the switch is released, any other switch is
pressed, or required conditions are no longer
met midway through a stowing operation, the
stowing operation will stop. The buzzer will
sound for 10 seconds and the indicator on the
switch will come on.
- If the system detects that an object is caught,
the system will stop the seat operation, the
indicator will blink, and the buzzer will sound
for 10 seconds.
- The indicator will go off when normal
operation resumes.
- The buzzer will sound twice when the
operation is complete.
- Return operation (from the folded-down state to the
original state)
- Switch operation
- Press and release the folding switch.
- Push the stowing/return switch to the left and
release it.
- Press the power rear no. 2 seat switch to
recline the seat back and release it.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
- The seat cushion is secured.
HINT:
- The power rear no. 2 seat switch can be
operated in the cabin to perform the return
operation even while the vehicle is being
driven.
- If any other switch is pressed midway through
a return operation, the return operation will
stop. The buzzer will sound for 10 seconds
and the indicator on the switch will come on.
- If the system detects that an object is caught,
the system will stop the return operation. The
buzzer will sound for 10 seconds and the
indicator on the switch will blink.
- The indicator will go off when normal
operation resumes.
- Folding-down operation (from the original state to
the folded-down state)
- Switch operation
Press and release the folding switch.
- Conditions
- The back door is open.
- The ignition switch is off or the shift lever is in
the P position.
- The seat cushion is secured.
HINT:
- If any switch other than the folding switch is
pressed midway through a folding-down
operation, the folding operation will stop. The
buzzer will sound for 10 seconds and the
indicator on the switch will come on.
- If the system detects that an object is caught,
the system will stop the folding operation. The
buzzer will sound for 10 seconds and the
indicator on the switch will blink.
- The indicator will go off when normal
operation resumes.
- Reclining operation
- Switch operation
Press the power rear no. 2 seat switch.
- Conditions
- The seat cushion is secured.
- The seatback is within the reclining operation
range.
HINT:
The operation will stop when the power rear no.
2 seat switch is released or when the seatback
position reaches either end of the reclining
operation range.
1. Before operating the power rear no. 2 seat with
stowing function, make sure that there is nothing in
the path of the seat.
CAUTION:
If someone or something is caught between the seat
and other ...
HINT:
Use these procedures to troubleshoot the power folding
seat system.
*: Use the intelligent tester.
1 VEHICLE BROUGHT TO WORKSHOP
2 INSPECT BATTERY VOLTAGE
Standard volta ...
Other materials:
On-vehicle inspection
1. INSPECT FRONT AIRBAG SENSOR (VEHICLE NOT
INVOLVED IN COLLISION)
Perform a diagnostic system check.
2. INSPECT FRONT AIRBAG SENSOR (VEHICLE
INVOLVED IN COLLISION AND AIRBAG HAS NOT
DEPLOYED)
Perform a diagnostic system check.
When the front bumper of the vehicle o ...
Installation
1. INSTALL STABILIZER BAR FRONT
2. INSTALL FRONT STABILIZER BAR BUSH NO.1
(a) Install the front stabilizer bar bush No. 1.
HINT:
Install the bushing to the outer side of the bushing
stopper on the stabilizer bar as shown in the
illustration.
4. INSTALL RACK & PINION POWER STEERING GEA ...
Short to GND in Curtain Shield Squib RH Circuit
DTC B1162/81 Short to GND in Curtain Shield Squib RH Circuit
DESCRIPTION
The curtain shield squib RH circuit consists of the center airbag sensor
assembly and the curtain shield
airbag assembly RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1162/81 is ...