Lexus SC300 / Lexus SC400. Manual — part 169
INSPECTION PROCEDURE
1
Check Motor
Slide
Front vertical
Rear vertical
OK
P
OK
OK
C
(1) Remove seat.
(2) Disconnect each motor connector.
Check seat movement when battery voltage is applied
to each motor.
Slide
Front vertical
Rear vertical
Terminal
Terminal
Terminal
Movement
Movement
Movement
Cushion rises
Forward
Back
Cushion lowers
Cushion rises
Cushion lowers
1
2
2
2
1
1
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
BE–289
OK
NG
OK
NG
Reclining
OK
Reclining
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
).
BE–290
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
WIRING DIAGRAM
Position Sensor Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to the slide, front vertical, rear vertical and reclining sensors.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Check voltage between terminals PVCC
of ECU connector and body ground.
OK
Proceed to next circuit inspection
shown on matrix chart (See page
NG
NG
OK
Check harness and connector connected to
terminal PVCC of ECU (See page
Repair or replace harness or
connector.
Check and replace ECU.
BE–292
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminal PVCC of ECU connector and body ground.
C
OK
P
Remove ECU with connectors still connected.
While operating the manual switch and moving the seat,
check voltage between terminal PVCC of ECU connec-
tor and body ground.
Voltage:
7 – 9 V
Proceed to next circuit inspection shown on matrix chart
(See page
2
Check for open and short in harness and connector connected to terminal PVCC of ECU (See
page
).
Check for open or short in the har-
nesses or connectors for the position
sensor power source circuit outlined
in the diagram with a thick line (
).
Repair or replace harness or connector.
Check and replace ECU.
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Driver’s Seat)
BE–293
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