Toyota Highlander Service Manual: On-vehicle inspection
1. CHECK POWER SEAT FUNCTION
(a) Check the basic functions.
- Operate the power seat switches and check to
make sure each seat function works:
- Sliding
- Front vertical (driver's seat only)
- Rear vertical (driver's seat only)
- Reclining
- Lumbar support (driver's seat only)
2. CHECK POWER SEAT MOTOR ASSY
(SLIDING, FRONT VERTICAL, REAR VERTICAL AND RECLINING FUNCTIONS)
HINT:
The front vertical function and rear vertical function are only available for
the driver's seat.
(a) Check the 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.
- 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.
- 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 electrical current has shut off by making sure the sound of
the motor has stopped.
Standard: 4 to 90 seconds
- After the current has stopped, release the power seat switch and
wait for approximately 60 seconds.
- 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.
- Repeat steps (1) to (4) for the remaining power seat functions.
3. Driver's seat only:
CHECK LUMBAR SUPPORT ADJUSTER ASSY LH
(a) Check the PTC operation inside the power seat motor.
NOTICE:
The inspection should be performed with the seat installed in the vehicle.
- Operate the lumbar support switch and move the lumbar support to
either the foremost or rearmost
position. Keep the seat in that position for approximately 60 seconds.
- Operate the lumbar support switch again and continue to try to
move the lumbar support in the
same direction as in step (1). Measure the amount of time elapsed before the
electrical current
is automatically cut. Check if electrical current has shut off by making
sure the sound of the motor
has stopped.
Standard: 4 to 90 seconds
- After the current has stopped, release the lumbar support switch
and wait for approximately 60
seconds.
- Operate the lumbar support switch and move the seat to the
opposite extreme of the direction
in step (1). Check that the motor operates.
PROBLEM SYMPTOMS TABLE
Symptom
Suspected Area
All power seat functions do not operate
POWER M-fuse
Wire harness
Only slide operation fu ...
1. INSPECT FRONT POWER SEAT SWITCH LH
(a) Check the resistance between the terminals when each
switch is operated.
Standard:
Slide switch
Driver's seat only:
Front vertical switch
D ...
More about Toyota Highlander:
Driving assist systems
To help enhance driving safety and performance, the following
systems operate automatically in response to various driving
situations. Be aware, however, that these systems are supplementary
and should not be relied upon too heavily when operating
the vehicle.
Abs (anti-lock brake system)
Help ...
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