1991 LEXUS SC400 Service Repair Manual

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Page 729 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The door lock control system has a key±interlocked door lock and unlock f\ unction and a key±confinement pre- vention function. All doors can be locked and unlocked simultaneously by\$

Page 730 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±363
WhereEverybodyKnowsYourName

Page 731 of 4087

$LEXUS SC400 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING Perform troubleshooting in accordance with the procedure on the following page.\ CUSTOMER PROBLEM ANALYSIS Using the customer problem analysis check sheet for$

Page 732 of 4087

LEXUS SC400 1991 Service Repair Manual
Vehicle Brought to WorkshopProblem does
not occur
Problem
occurs Customer Problem Analysis
Problem Symptom Confirmation
Matrix Chart of Problem Symptoms P. BE±371 Symptom Simulation
P. IN±20
Char

Page 733 of 4087

$LEXUS SC400 1991 Service Repair Manual CUSTOMER PROBLEM ANALYSIS CHECK SHEET \ \ \ DOOR LOCK CONTROL System Check Sheet Inspector s Name : $

CUSTOMER PROBLEM ANALYSIS CHECK SHEET
\

\

\
DOOR LOCK CONTROL System Check Sheet
Inspector 's
Name :
Registration No.

Customer 's Name

Registration Year

//

Frame No.

Date Vehicle
Brought In

//

Odometer Reading

km
Miles
Date of Problem Occurrence\
\
//

Frequency of Problem Occurrence
\

\

\

\

Constant Sometimes ( times/per day, month)
Once only

Conditions at
Ti f P bl

Weather
\

\

\

Fine Cloudy Rainy Snowy
Various/Others

Time of Problem
Occurrence

Outdoor
Temperature
\

\

\

Hot Warm Cool
Cold (Approx. 5F ( 5C))

Malfunction in Door Lock/Unlock
Operation Using Door Lock
Control Switch

Driver's side door lock
control switch

Driver's side door
Passenger's side door

Passenger's side door lock
control switch

Driver's side door
Passenger's door

Malfunction in Door Lock/Unlock
Operation Using Key.

Driver's side door key
operated switch

Driver's side door
Passenger's side door

Passenger's side door key
operated switch

Driver's side door
Passenger's side door

\

\

\

\

2±operation unlock function of driver's side door key operated
switch.
\
\
Malfunction in Key Confinement Prevention Function.
\
\
Malfunction in Luggage Compartment Door Opener Function.

\

\

\

Others
Problem Symptom
BE±366±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName

Page 734 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±367
WhereEverybodyKnowsYourName

Page 735 of 4087

LEXUS SC400 1991 Service Repair Manual
TERMINALS OF ECU
No. Symbol Terminal Name No. Symbol Terminal Name T8±3 ACT ±

Page 736 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
T9±3
e T9±4 ACT e ACT+ L±W e L±R Ignition switch OFF 50 or less
T9±5 e T9±16 T0 e E B e W±B Ignition switch OFF 100 or less

T9 6 eT9 16

KSW eE

Ye WB
Key unlock warning switch ON.
(Key is inserted into key cylinder). 1 or less

T9±6
e T9±16

KSW
e E

Y
e W±B

Key unlock warning switch OFF.
(Key is not inserted into key cylinder).

1 M
or higher

T9±7
e T9±16

LSWP
e E

P±B
e W±B

Door unlock detection switch ON.
(Passenger's)

1
or less
Door unlock detection switch OFF. 1 M higher
T9±8 e T9±16 +B2 e E L±W e W±B Always 10±14 V

T9 10 eT9 16

UL3 eE

Ge WB
Door key lock and unlock switch ºunlockº
position. 1 or less

T9±10
e T9±16

UL3
e E

G
e W±B

Door key lock and unlock switch OFF or
ºlockº position.

1 M
or higher

T9 11 eT9 16

LSWD eE

WL eWB
Door unlock detection switch ON. (driver's) 1 or less
T9±11 e T9±16 LSWD e E W±L e W±B Door unlock detection switch OFF. (driver's) 1 M or higher

T9 12
eT9 16

DSWP
eE

RW
eWB

Door open detection switch (passenger's)
ON (door opened).

1
or less

T9±12
e T9±16

DSWP
e E

R±W
e W±B

Door open detection switch (passenger's)
OFF (door closed).

1 M
or higher

T9 13 eT9 16

DSWD eE

RB eWB
Door open detection switch (driver's)
ON (door opened). 1 or less

T9±13
e T9±16

DSWD
e E

R±B
e W±B

Door open detection switch (driver's)
OFF (Door closed).

1 M
or higher

T9 14
eT9 16

L1
eE

GY
eWB

Door key lock and unlock switch ºlockº
position.

1
or less

T9±14
e T9±16

L1
e E

G±Y
e W±B

Door key lock and unlock switch OFF or
ºunlockº position.

1 M
or higher

T9 15 eT9 16

UL1 eE

GW eWB
Door key lock and unlock switch ºunlockº
position. 1 or less

T9±15
e T9±16

UL1
e E

G±W
e W±B

Door key lock and unlock switch OFF or
ºlockº position.

1 M
or higher

T9±16
e Body
Ground

E
e Body
Ground

W±B
e Body
Ground

Always

1
or less
Door lock control switch ªlockº position. 1 or less

T9±17 e T9±16

L2 e E

R±B e W±B

Door lock control switch OFF or ªunlockº
position.

1 M or higher
Door lock control switch ªunlockº position 1 or less

T9±18
e T9±16

UL2
e E

G±L
e W±B

Door lock control switch OFF or ªlockº
position.

1 M
or higher
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±369
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