1991 LEXUS SC400 Service Repair Manual

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LEXUS SC400 1991  Service Repair Manual 
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Drivers Seat)BE±281 
WhereEverybodyKnowsYourName

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LEXUS SC400 1991  Service Repair Manual 
Location of Connectors in Seat
BE±282±
BODY ELECTRICAL SYSTEM Power Seat Control System (Drivers Seat) 
WhereEverybodyKnowsYourName

Page 667 of 4087

LEXUS SC400 1991  Service Repair Manual 
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Drivers Seat)BE±283 
WhereEverybodyKnowsYourName

Page 668 of 4087

LEXUS SC400 1991  Service Repair Manual 
CIRCUIT INSPECTION
+B Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for motors such as the slide motor and reclining mo\
tor.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Check Door fuse.NG
C

Page 669 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
NGOK
OKNG
INSPECTION PROCEDURE
1Check DOOR fuse.
Check for short in all the harness and components con-
nected to the DOOR fuse (See attached wiring diagram).
2Check voltage between terminals +B

Page 670 of 4087

LEXUS SC400 1991  Service Repair Manual 
WIRING DIAGRAM
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power for ECU operation and is also the power source f\
or the sensors.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Check DOME f

Page 671 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
NGOK
OKNG
INSPECTION PROCEDURE
1Check DOME fuse.
Check for short in all the harness and components con-
nected to the DOME fuse (See attached wiring diagram).
2Check voltage between terminals SY

Page 672 of 4087

LEXUS SC400 1991  Service Repair Manual 
WIRING DIAGRAM
Motor Circuit
CIRCUIT DESCRIPTION
The drivers seat ECU controls the 4 motors for slide, front vertical, rear vertica\
l and reclining.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Inspect the cir