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72-4
SEAT - FRONT POWER SEAT CONTROL SYSTEM
7207I-03
ON-VEHICLE INSPECTION
1. CHECK POWER SEAT FUNCTION
Reclining Function
(a) Check the basic functions.
Lumbar Support (1) Operate the power seat switches and check that the
Function following seat functions work:
S Sliding
Lifter Function
S Front vertical (Driver side seat only)
S Lifter (Driver side seat only)
S Reclining
S Lumbar support (Driver side seat only)
Front Vertical
Function Sliding Function
B66944 B89047
2. CHECK POWER SEAT MOTOR ASSY
(SLIDING, FRONT VERTICAL, REAR VERTICAL AND RECLINING FUNCTIONS)
(a) Check PTC operation inside the power seat motor.
HINT:
The PTC thermistor's resistance increases when the power seat switch is held down even after the power
seat has been moved to the maximum in one direction. After the resistance increases, current is shut off to
prevent a short circuit.
NOTICE:
Perform steps (1) to (4) for the full range of motion for each power seat function.
(1) Choose a power seat function. Operate the power seat switch and move the seat to the maximum
in one direction. Keep the seat in that position for approximately 60 seconds.
(2) Operate the power seat switch again and continue to try to move the seat in the same direction
as in step (1). Measure the amount of time elapsed before the electrical current is automatically
cut. Check if the electrical current has shut off by making sure the sound of the motor has
stopped.
Standard: 4 to 90 seconds
(3) After the current has stopped, release the power seat switch and wait for approximately 60 se-
conds.
(4) Operate the same power seat switch and move the seat to the opposite extreme of the direction
in step (1). Check that the motor operates.
(5) Repeat steps (1) to (4) for the remaining power seat functions.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 3250
72-5
SEAT - FRONT POWER SEAT CONTROL SYSTEM
3. CHECK LUMBAR SUPPORT ADJUSTER ASSY LH
(a) Inspect PTC operation inside the power seat motor.
NOTICE:
The inspection should be performed with the seat installed in the vehicle.
(1) Move the lumbar support to either the foremost or rearmost position by operating the lumbar sup-
port switch, and hold it there for approx. 60 seconds.
(2) Try to move the lumbar support past the maximum position using the switch and measure the
time until the electrical current is shut off (motor operation sound will stop, inspection of current
shut-of f).
Standard: 4 to 90 seconds
(3) Turn off the lumbar support switch after the inspection of current shut-off, and keep that condition
for approx. 60 seconds.
(4) Operate the lumbar support switch to move the lumbar support to the opposite position and
check that the motor operates.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 3251
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