Lexus SC300 / Lexus SC400. Manual — part 164
PARTS LOCATION
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BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
BE–267
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.
CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet for reference, ask the customer in as much detail as
possible about the problem.
PROBLEM
SYMPTOM
CONFIRMATION,
SYMPTOM SIMULATION.
Confirm the problem symptoms. If the problem does not reappear, be sure to simulate the problem using
the ”Problem Simulation Methods”.
When checking the problem symptoms, pay attention to the following points to accurately define the symp-
toms and the extent of the problem:
For ”Not Functioning” problems:
(1) Is the problem only in one part (e.g. ”reclining only”), or everything?
(2) Is the problem only for manual operation, only for position return operation, or for both manual and
position return operation?
(3) Is tilt, telescopic and outer mirror operation normal?
(4) Does the problem occur with the ignition key inserted, or not inserted?
MATRIX CHART OF PROBLEM SYMPTOMS
Confirm the order of inspection on the matrix chart for the particular problem symptom involved. For ”Not
Functioning” problems, pay attention to the points in
. to find out the specifics of the problem, then choose
the most appropriate problem symptom from among those listed on the matrix chart, and proceed with trou-
bleshooting accordingly.
CIRCUIT
INSPECTION
Proceed with diagnosis of each circuit in accordance with the inspection order confirmed in
.
Determine whether the cause of the problem is in the sensor, actuators, wire harness and connectors, or
the ECU.
POSITION SENSOR CHECK
This function checks that the signal from each position sensor is correctly input into the ECU when the
manual switch is turned ON. The instructions for this diagnosis are included in the flow chart for the position
sensor circuit.
REPAIR
After the cause of the problem is located, perform repairs by following the inspection and replacement pro-
cedures is this manual.
CONFIRMATION
TEST
After completing repairs, confirm that the problem is eliminated and that tilt, telescopic and outer mirror
operation is normal.
BE–268
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BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
BE–269
CUSTOMER PROBLEM ANALYSIS CHECK SHEET
POWER SEAT Check Sheet
Inspector ’s
Name
:
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Registration No.
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Customer’s Name
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Registration Year
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/
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Frame No.
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Date Vehicle
Brought In
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Odometer Reading
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Km
Miles
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Condition of
Problem
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Date Problem
Occurrence
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/
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Problem
Occurrence
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How Often does
Problem Occur?
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Continuous
Intermittent (
times a day)
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Manual Function
does not operate
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Slide
Front Vertical
Rear Vertical
Reclining
Lumbar Support
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Symptoms
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Return Function
does not operate
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Slide
Front Vertical
Rear Vertical
Reclining
Does not operate in any conditions
Only with key inserted
Only with key not inserted
Only with memory & return switch 1 or 2
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Memory function does not operate.
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Position return function does not stop when brake pedal is depressed.
For “Return function does not operate” malfunctions, check the return operation of the items below.
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Ch
k It
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Tilt & Telescopic
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OK
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Check Item
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Outer Mirror
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OK
NG
BE–270
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BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
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