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Lexus SC300 / Lexus SC400. Service 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)

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BODY ELECTRICAL SYSTEM

Power Seat Control System (Driver’s Seat)

BE–269

CUSTOMER PROBLEM ANALYSIS CHECK SHEET

POWER SEAT Check Sheet

Inspector ’s
Name

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Registration No.

ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Customer’s Name

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Registration Year

ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Frame No.

ÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Date Vehicle
Brought In

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Odometer Reading

ÑÑÑÑÑÑÑÑÑÑÑ

Km
Miles

ÑÑÑÑÑÑÑÑÑ

Condition of
Problem

ÑÑÑÑÑÑÑÑÑÑ

Date Problem
Occurrence

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Problem
Occurrence

ÑÑÑÑÑÑÑÑÑÑ

How Often does
Problem Occur?

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Continuous

Intermittent (

times a day)

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

Manual Function
does not operate

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Slide

Front Vertical

Rear Vertical

Reclining

Lumbar Support

ÑÑÑÑÑÑÑÑÑ

Symptoms

ÑÑÑÑÑÑÑÑÑÑ

Return Function
does not operate

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

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

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Memory function does not operate.

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

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.

ÑÑÑÑÑÑÑÑÑ

k It

ÑÑÑÑÑÑÑÑÑÑ

Tilt & Telescopic

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑ

Check Item

ÑÑÑÑÑÑÑÑÑÑ

Outer Mirror

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

BE–270

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BODY ELECTRICAL SYSTEM

Power Seat Control System (Driver’s Seat)

Content .. 162 163 164 165 ..