1991 LEXUS SC400 Service Repair Manual

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Page 697 of 4087

$LEXUS SC400 1991 Service Repair Manual CUSTOMER PROBLEM ANALYSIS CHECK SHEET \ \ \ POWER WALK±IN Check Sheet Inspector s Name : $

Page 698 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
Terminal of ECU
No.SymbolTerminal NameNo.SymbolTerminal Name
P12±1SYSBPower SourceP12±10PFSWReclining Front Limit Switch
2SLSWSlide Limit Switch11SSRSSlide Sensor
3PVCCPosition Senso

Page 699 of 4087

LEXUS SC400 1991 Service Repair Manual
STANDARD VALUE OF ECU TERMINAL

Terminals

Symbols

Wiring
Color

Condition

STANDARD VALUE OF ECU TERMINAL

Terminals

Symbols

Wiring
Color

Condition

Standard Value
P12±1
eP12±16 SYS eBGND Re W±B Always 10 ~ 14 V

P12±2
e

SLSW
e

V±W
e

Slide neutral limit switch OFF
(Passenger's seat is slided at most back position, when
power seat operation)

10 ~ 14 V

P12 2
e
Body Ground

SLSW
e
Body Ground

VW
e
Body Ground

Slide neutral limit switch ON
(Passenger's seat is slided 120 mm or more from most
back position, when power seat operation)

Below 1 V
P12±3
eP12±15PVCC eSGNDVe BRAlways (When power seat operation)10 ~ 14 V P12±4 DOUT ' ' '
P12 eP12 16

SLDR eGND

LR eWB
Slide switch is pushed back 10 ~ 14 V P12 eP12±16 SLDR eGND L±R eW±B Others Below 1 V

P12 6 eP12 16

SLDF eGND

LY eWB
Slide switch is pushed forward 10 ~ 14 V
P12±6 eP12±16 SLDF eGND L±Y eW±B Others Below 1 V
P12 7 eP12 16 SLD+ eGND Le WB Slide switch is pushed forward 10 V ~ 14 V
P12±7 eP12±16 SLD+ eGND Le W±B Others Below 1 V
P12±8 eP12±16+B eGNDL±W eW±BAlways10 ~ 14 V

P12±9
e

PRDC
e

B
e

Passenger's buckle switch ON and ignition switch ON
(Tung plate is inserted into buckle switch)

Below 1 V

P12 9
e
Body Ground

PRDC
e
Body Ground

B
e
Body Ground

Passenger's buckle switch OFF and Ignition switch ON
(Tung plate is not inserted into buckle switch)

10 ~ 14 V

P12±10
e

RFSW
e

Y
e

Reclining front limit switch OFF (Passenger's seat
back is moved backward, when power seat operation)

10 ~ 14 V

P12 10
e
Body Ground
RFSWe
Body Ground
Ye
Body Ground Reclining front limit switch ON (Passenger's seat
back is moved forward, when power seat operation) Below 1 V

P12±11
eP12±15

SSRS
eSGND

LG
eBR

When passenger's seat is sliding back and forth,
when power seat operation

0
e 12 V

P12±12
e

PBCL
e

B±Y
e

Passenger's buckle switch OFF (Tung plate is not
inserted into buckle switch, when power seat operation)

10 ~ 14 V

P12 12
e
Body Ground
PBCLe
Body Ground
BYe
Body Ground Passenger's buckle switch ON (Tung plate is inserted
into buckle switch, when power seat operation) Below 1 V

P12 13
eP12 16

PRSW
eGND

LG R
eWB

Reclining rear limit switch OFF (Passenger's seat
back is moved backward, when power seat operation)

10 ~ 14 V

P12±13
eP12±16

PRSW
eGND

LG±R
eW±B

Reclining rear limit switch ON (Passenger's seat
back is moved forward, when power seat operation)

Below 1 V
P12±14 CHK ' ' '
P12±15
eSGNDeBReAlways1 or less Body Ground Body Ground Body Ground Always 1 or less
P12±16 e GNDe W±Be
Always

1 or less Body Ground Body Ground Body Ground Always 1 or less

P12 17 eP12 16

SLD eGND

LB eWB
Slide switch is pushed back 10 ~ 14 V
P12±17 eP12±16 SLD± eGND L±B eW±B Others Below 1 V
P12±18 ' ' ' '
BE±318±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passenger's Seat)
WhereEverybodyKnowsYourName

Page 700 of 4087

LEXUS SC400 1991 Service Repair Manual
See page
BE±326
BE±32
4
BE±32 8
BE±33
0
BE±33 4
BE±33 8
BE±34 0
BE±34 4
IN±32
MATRIX CHART OF PROBLEM SYMPTOMS
Perform troubleshooting the circuits for the applicable problem symptom in the

Page 701 of 4087

LEXUS SC400 1991 Service Repair Manual
LOCATION OF CONNECTORS
Location of Connectors in Engine Compartment
BE±320±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)
WhereEverybodyKnowsYourName

Page 702 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Instrument Panel
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)BE±321
WhereEverybodyKnowsYourName

Page 703 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Body
BE±322±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)
WhereEverybodyKnowsYourName

Page 704 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Seat
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)BE±323
WhereEverybodyKnowsYourName

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