Toyota Sienna Service Manual: On-vehicle inspection
1. CHECK POWER SEAT FUNCTION

- Check the basic functions.
- Operate the power seat switches and check the
following seat functions:
- Sliding
- Reclining
- Front vertical (Driver side seat only)
- Lifter (Driver side seat only)
- Lumbar support (Driver side seat only)
2. CHECK POWER SEAT MOTOR ASSEMBLY (SLIDING,
FRONT VERTICAL, LIFTER AND RECLINING
FUNCTIONS)
- Inspect the PTC operation inside the power seat
motor.
NOTICE:
The inspection should be performed with the
seat installed in the vehicle.
- Move the seat to any of the maximum position
by operating the power seat switch, and keep
the seat there for approximately 60 seconds.
- Try to move the power seat beyond the
maximum position using the power seat switch.
Measure the time needed for shutting off the
electrical current after the lumbar support stops
moving. (motor operation sound will stop,
inspection of current shut-off).
Standard:
4 to 90 seconds
- Release the power seat switch, and wait for
approximately 60 seconds.
- Operate the power seat switch to move the
seat to the opposite position and check that the
motor operates.
3. CHECK LUMBAR SUPPORT ADJUSTER ASSEMBLY
- Inspect the PTC operation inside the power seat
motor.
NOTICE:
The inspection should be performed with the
seat installed in the vehicle.
- Move the lumbar support to either the foremost
or rearmost position by operating the lumbar
support switch, and keep it there for
approximately 60 seconds.
- Try to move the lumbar support beyond the
maximum position using the switch. Measure
the time needed for shutting off the electrical
current after the lumbar support stops moving.
(motor operation sound will stop, inspection of
current shut-off).
Standard:
4 to 90 seconds
- Release the lumbar support switch, and wait for
approximately 60 seconds.
- Operate the lumbar support switch to move the
lumbar support to the opposite position and
check that the motor operates.
4. CHECK MEMORY AND REACTIVATION FUNCTION
(w/ MEMORY)

- Turn the ignition switch on and move the shift lever
into the P position.
- Move the seat into the foremost position and
uppermost position using each seat switch.
- Check that the buzzer sounds for 0.5 seconds. The
seat position is recorded when the SW1 switch is
pressed while also pressing the SET switch.
- Move the seat out of the foremost position and
uppermost position using each seat switch.
- Check that the buzzer sounds for 0.5 seconds. The
seat position is recorded when the SW2 switch is
pressed while also pressing the SET switch.
- Check that the buzzer sounds for 0.1 seconds and
the seat automatically moves into the foremost
position and uppermost position (SET positions)
when the SW1 switch is pressed.
- Check that the buzzer sounds for 0.1 seconds and
the seat automatically moves out of the foremost
position and uppermost position (SET positions)
when the SW2 switch is pressed.
- Check that the seat automatically moves into the
SET position when the SW1 or SW2 switch is
pressed within 30 seconds after the ignition switch
is turned off, the key is pulled out from the key
cylinder and the driver side door is opened.
- Move the seat either forward or back as far as the
seat will move, and disconnect the negative terminal
of the battery while the memory switch is pressed.
Then leave the seat at the position for 3 minutes to
erase the seat position memory.
- Move the seat into all the maximum positions (front/
rear and up/down) using each seat switch.
- Check that the seat does not move (the seat
position is not recorded) by performing the following
steps while pressing the SET switch. Press either
the SW1 switch or the SW2 switch after pressing
SW1 and SW2 at the same time.
1. DATA LIST
HINT:
Using the intelligent tester's DATA LIST allows the status
of a switch, sensor, actuator and other items to be read
without removing any parts. Reading the DATA LIST
early in t ...
DESCRIPTION
When the power seat control switch is operated, a command signal is sent to
the position control ECU
and switch assembly (power seat control switch and ECU). The front power seat
swi ...
Other materials:
Engine Coolant Temperature / Intake Air Temperature Correlation
DESCRIPTION
The ECM calculates the difference between the readings of the coolant
temperature sensor and intake air
temperature sensor. If the difference is greater than 20°C (68°F), the ECM will
judge this as a malfunction
and will set this DTC.
HINT:
Waiting is required t ...
Vehicle tool kit
The onboard vehicle tool kit is located in the left
storage compartment of the cargo area under a
cover.
Wiper blades
Safety information
NOTICE The window may sustain damage if the wiper
falls onto it without the wiper blade installed.
There is a risk of damage to property. Hold the
wiper firmly w ...
If a warning light turns on
or a warning buzzer
sounds
Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your Toyota dealer.
Warnin ...