Lexus SC300 / Lexus SC400. Manual — part 178
WIRING DIAGRAM
Slide Motor Circuit
CIRCUIT DESCRIPTION
The passenger’s seat ECU control the slide motor.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Check slide motor.
NG
NG
OK
OK
Replace motor.
Repair or replace harness or
connector.
Check harness and connector between
ECU and motor (See page
Proceed to next circuit inspection shown
on matrix chart (See page
BE–328
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check Slide Motor.
C
OK
P
(1) Remove Seat
(2) Disconnect slide motor connector.
Check seat movement when battery voltage is applied
to slide motor.
Connect positive
(negative
) terminal to terminal 1
of slide motor connector and negative
(positive
)
terminal to terminal 2.
Terminal
Movement
Forward
Back
1
2
Replace motor.
2
Check for open and short in harness and connector between ECU and motor (See page
Repair or replace harness or connector.
Proceed to next circuit inspection shown on ma-
trix chart (See page
).
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
BE–329
WIRING DIAGRAM
Position Sensor Circuit
CIRCUIT DESCRIPTION
The position sensor senses movement of the seat and send
pulse signals to the ECU. The position sensor sends pulses
to the ECU in proportion to the amount of seat movement, as
shown in the diagram on the left.
If a malfunction occurs in a position sensor and a sensor sig-
nal is not input to the ECU even when the motor operates, the
ECU prohibits return operation.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Inspect the circuit which is malfunctioning.
Position sensor check.
OK
NG
OK
OK
NG
NG
Proceed to next circuit inspection
shown on matrix chart (See page
Replace position sensor.
Check position sensor.
Check harness and connectors between
ECU and position sensor (See page
Repair or replace harness or
connector.
Check and replace ECU.
BE–330
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
INSPECTION PROCEDURE
1
Position Sensor Check.
C
Hint
P
(1) Remove the passenger’s seat.
(2) Remove the bolts for seat rail and lift the seat cush-
ion up a little.
Notice: If the seat cushion is lifted too high, the har-
ness will be pulled and the clamp may come loose.
(3) Remove the ECU with the connector attached from
where it is installed to the underside of the seat
cushion.
Position sensor check
(1) Connect terminal CHK of the ECU to body ground
to put the ECU into check mode.
(2) Measure voltage between terminal DOUT of ECU
and body ground.
Use an analog type meter.
(3) Check that the “ready” code is output as shown in
the illustration.
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
BE–331
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