1991 LEXUS SC300 headrest

SEAT
Front Seat
REMOVAL OF FRONT SEAT
1. REMOVE HEADRESTWhile pushing the lock button, pull up the headrest to remove
it.
2. REMOVE SEAT TRACK COVERS Using a screwdriver, pry out three covers.
HINT: Tape the screwdriver tip before use.
3. REMOVE SEAT TRACK COVER (Rear inner side)
(a) Lift up the rear part of the cover.
(b) Pull the cover straight back±wards.
BO±58
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BODY Seat (Front Seat)
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4. REMOVE FRONT SEAT(a) Remove five bolts.
(b) Disconnect the connector.
INSTALLATION OF FRONT SEAT
(See page BO±58)
1. INSTALL HEADREST TO SEAT
2. INSTALL FRONT SEAT (a) Connect the connector.
(b) Install five bolts.
Torque: 37 N Vm (375 kgf Vcm, 27 ft Vlbf)
3. CHECK SEAT ADJUSTER PROPER OPERATION
4. INSTALL SEAT TRACK COVERS
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BODY Seat (Front Seat)BO±59
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4. REMOVE SEAT CUSHION ASSEMBLY(a) Remove four bolts.
(b) Disconnect the connectors.
(c) Remove the seat cushion assembly.
5. REMOVE FRONT SEAT INNER BELT
6. REMOVE SEAT BACK COVER (a) Remove headrest grommet.
(b) Peel the seat back cover away from around the seatback cushion.
7. REMOVE SEAT TRUCK Remove four bolts and the seat truck.
8. REMOVE LUMBER SUPPORT MOTOR Remove two bolts and the motor.
BO±62
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BODY Seat (Front Seat)
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NGOK
1Position sensor check (Cont'd).
OK
Hint
(4) Operate the power seat manual switch and checkthe change in the voltage when the seat is moving.
(5) The changes in the output voltage when the input signal is normal and when it is abnormal are shown
in the illustrations. Compare the results with those
from (4) and diagnose the condition of each circuit.

The OK and NG codes continue to be output while the
manual switch is ON.

When the seat reaches the limit of movement, e.g.
when the headrest reaches the highest or lowest
position, the voltage changes from the OK code to
the NG code.
After operating any of the system functions with no
problem and confirming the OK code and NG code by
comparing the amount of wavering of the voltmeter
needle, inspect the function with a problem.

The amount of wavering of the voltmeter needle
depends on the meter.
OutputOK
NG
OK Code
NG Code
Proceed to next circuit inspection shown on the matrix
chart (See page BE±318).
Go to step [2].
BE±332±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passenger's Seat)
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