Lexus SC300 / Lexus SC400. Service manual - part 1018

113

M

6

4

5

3

1

2

1K

4

2

2

2

2

I11

B 7

B 7

I11

EB1

3

IE1

15

IP1

20

IP1

8

IP1

19

IP1

15

IP1

6

IP1

18

IP1

5

IP1

14

IE1

14

BT1

9

IP1

7

A

15

UL1

A

12

DSWP

A

7

LSWP

A

3

ACT–

A

4

ACT+

B

12

DSWH

A

5

TO

A

1

SRLY

2

5

1

3

2

3

1

2

3

1

IJ

EA

2

1

P

R

N

D

2

L

1

4

6

5

7

8

9

GR

R–

B

L

G–

W

G

W

A/T INDICATOR SW
[NEUTRAL START SW AND

BACK–UP LIGHT SW]

N 1

2

3

FROM POWER SOYURCE SYSTEM (SEE PAGE 56)

7. 5A
ST

P

N

STARTER
RELAY

THEFT DETERRENT AND DOOR LOCK ECU

LO

C

K

UN

L

O

C

K

LO

C

K

UN

L

O

C

K

D

O

O

R

KEY

L

O

C

K

A

N

D

UN

L

O

C

K

S

W

RH

D

O

O

R

L

O

CK

M

O

T

O

R,

D

O

O

R

U

N

L

O

CK

D

E

T

E

CT

IO

N

A

ND

D

OOR

OP

E

N

D

E

T

E

C

T

ION

S

W

R

H

D

OOR

L

OC

K

C

O

NT

RO

L

S

W

R

H

E

N

GI

N

E

H

OOD

C

O

U

R

T

ESY

S

W

L

U

GGA

GE

C

OM

P

A

R

T

M

E

N

T

D

O

O

R

O

PEN

ER

M

O

T

O

R

G–Y

G–L

R–B

L–W

L–R

W–B

L–R

L–R

B

Y

W

B

L–

O

B

B

L–O

B

G–

L

L–R

G–

L

B

W–

B

W–

B

L–

R

W–

B

W–

B

W–

B

W–

B

W–

B

L–

R

R–

B

G–

L

L–

W

P–

B

R–

W

G–

W

G–

Y

G–

Y

G–

W

R–

W

P–

B

L–

W

R–

B

G–

L

L–W

P–

B

R–

W

G–

W

L4

E5

D9

D1

1

D8

T 8

, T 9

B

A

M

1

IJ1

6

B–W

(A/T)

IJ2

8

B–W

B

(M/T)

(M/T)

B–

W

(A/

T

)

B–W

(M/T)

CL

UT

CH

S

T

A

RT

SW

(M/

T

)

C2

3

(A/

T

)

B33

W–

B

W–B

114

THEFT DETERRENT AND DOOR LOCK CONTROL

2

5

1K

7

1E

5

4

4

1I

7

1J

1

3

1

1

IE1

9

2

1

BM

IF

BL

BT1

8

BT1

7

IG1

2

IJ1

4

IJ1

9

B

11

HORN

B

4

SH

B

8

PRLY

A

8

+B2

B

1

LUG

B

10

DSWL

A

9

IND

4

I 7

2

1

2

1

4

3

3

15

10

1

2

BY1

8

IH

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

25A
HAZ–HORN

30A
POWER

30A
DOOR

POWER
MAIN
RELAY

W

W

W

W

G–

R

WW

B–

O

B–

O

Y–

R

W–

B

L–

W

L–

W

L–R

L–R

W–

B

W–

B

G–

B

R–

W

L–G

L–G

R–

W

G–

B

R

BR

W–

B

TRIP SW AND
THEFT DETERRENT
INDICATOR LIGHT

COMBINATION
METER

FU

E

L

L

ID

O

PEN

ER

SO

L

EN

O

ID

FU

E

L

L

ID

O

PEN

ER

S

W

THEFT
DETERRENT
HORN

HORN
RELAY

L

U

GGA

GE

C

OM

P

A

R

T

M

E

N

T

LIG

H

T

S

W

L

U

GGA

GE

C

OM

P

A

R

T

M

E

N

T

K

E

YU

N

L

O

C

KS

W

THEFT DETERRENT AND DOOR LOCK ECU

T 8

,

T 9

T 1

F1

0

F1

4

T15

C14

L6

L5

B

A

B

6

5

2

3

1

115

CURRENT ALWAYS FLOWS TO TERMINAL (A)8 OF THE DOOR LOCK ECU THROUGH THE DOOR FUSE, AND TO TERMINAL (A)20
THROUGH THE DOME FUSE.

WHEN THE IGNITION SW IS TURNED ON, THE CURRENT FLOWING THROUGH THE ECU–IG FUSE 

→

 TERMINAL (A)2 OF THE ECU 

→

TERMINAL (B)8 FLOWS THROUGH THE COIL SIDE OF THE POWER MAIN RELAY TO GROUND, CAUSING THE RELAY TO OPERATE.
THE CURRENT FLOWING THROUGH THE POWER FUSE FLOWS TO THE DOOR LOCK CONTROL SW LH, CAUSING THE INDICATOR
LIGHT TO LIGHT UP.

1. MANUAL LOCK OPERATION

WHEN THE DOOR CONTROL SW OR KEY SW ARE PUSHED TO LOCK POSITION, A LOCK SIGNAL IS INPUT TO TERMINAL (A)17, (A)14
(FOR KEY SW) OF THE DOOR LOCK ECU AND CAUSES THE ECU TO FUNCTION. CURRENT FLOWS FROM TERMINAL (A)8 OF THE
ECU 

→

 TERMINAL (A)4 

→

 TERMINAL 5 OF THE DOOR LOCK MOTORS 

→

 TERMINAL 2 

→

 TERMINAL (A)3 OF THE ECU 

→

 TERMINAL

(A)16 

→

 TO GROUND AND THE DOOR LOCK MOTOR CAUSES THE DOOR TO LOCK.

2. MANUAL UNLOCK OPERATION

WHEN THE DOOR LOCK CONTROL SW OR KEY ARE PUSHED TO UNLOCK POSITION, AN UNLOCK SIGNAL IS INPUT TO TERMINAL
(A)18, (A)10 (FOR KEY SW LH) OR (A)15 (FOR KEY SW RH) OF THE DOOR LOCK ECU AND CAUSES THE ECU TO FUNCTION.
CURRENT FLOWS FROM TERMINAL (A)8 OF THE ECU 

→

 TERMINAL (A)3 

→

 TERMINAL 2 OF THE DOOR LOCK MOTORS 

→

 TERMINAL

5 

→

TERMINAL (A)4 OF THE ECU 

→

TERMINAL (A)16 

→

TO  GROUND  AND THE DOOR LOCK MOTOR CAUSES THE DOOR TO

UNLOCK.

WHEN UNLOCK OPERATION OCCURS USING THE LH DOOR KEY SW, PERFORMING THE UNLOCK OPERATION ONCE UNLOCKS
ONLY THE DRIVER’S DOOR. TO UNLOCK ALL THE OTHER DOORS TOGETHER, UNLOCK OPERATION MUST BE PERFORMED AGAIN
WITHIN 3 SECONDS OF THE FIRST OPERATION.

3. IGNITION KEY REMINDER OPERATION

* OPERATION OF DOOR LOCK BUTTON (OPERATION OF DOOR LOCK MOTORS)

WHEN THE IGNITION KEY IS IN THE CYLINDER (UNLOCK WARNING SW ON) AND THE DOOR IS OPENED AND LOCKED USING
DOOR LOCK BUTTON (DOOR LOCK MOTOR), THE DOOR IS LOCKED ONCE BUT EACH DOOR IS UNLOCKED SOON BY THE
OPERATION OF THE ECU. AS A RESULT OF ECU ACTIVATION, THE CURRENT FLOWS FROM TERMINAL (A)8 OF THE ECU 

→

TERMINAL (A)3 

→

 TERMINAL 2 OF THE DOOR LOCK MOTORS 

→

 TERMINAL 5 

→

 TERMINAL (A)4 OF THE ECU 

→

 TERMINAL (A)16

→

 TO GROUND AND CAUSES ALL THE DOORS TO UNLOCK.

THE SAME APPLIES TO OPERATION OF THE DOOR LOCK CONTROL SW AND DOOR LOCK KEY SW.

* KEY LESS LOCK OPERATION

WHEN THE IGNITION KEY IS STILL INSERTED IN THE CYLINDER (UNLOCK WARNING SW ON), THE DOOR IS OPEN AND UNLOCK
OPERATION IS PREVENTED BY KEEPING THE DOOR LOCK BUTTON PRESSED TO THE LOCK SIDE, THE DOOR IS KEPT IN THE
LOCK CONDITION. IF THE DOOR IS THEN CLOSED, A SIGNAL IS INPUT TO THE ECU FROM THE DOOR COURTESY SW. THIS
ACTIVATES THE ECU AND EACH DOOR IS UNLOCKED.

SYSTEM OUTLINE

116

THEFT DETERRENT AND DOOR LOCK CONTROL

D 7, D 8

 

 

DOOR KEY LOCK AND UNLOCK SW LH, RH

1–2 : CLOSED WITH DOOR LOCK CYLINDER UNLOCKED WITH KEY
3–2 : CLOSED WITH DOOR LOCK CYLINDER LOCKED WITH KEY

D10, D11

  DOOR LOCK MOTOR, DOOR UNLOCK DETECTION SW AND DOOR OPEN DETECTION SW LH, RH

1–4: CLOSED 

WITH 

UNLOCK POSITION

E 5

 

 ENGINE HOOD COURTESY SW

1–2:

CLOSED WITH ENGINE HOOD OPEN

I15

  UNLOCK WARNING SW [IGNITION SW]

9–10: CLOSED WITH IGNITION KEY IN CYLINDER

L 5

 

 LUGGAGE COMPARTMENT KEY UNLOCK SW

1–3:

CLOSED WITH DOOR LOCK CYLINDER UNLOCK WITH KEY

L 6

  LUGGAGE COMPARTMENT LIGHT SW

1–GROUND: CLOSED WITH DOOR OPEN

T 8

(B)  THEFT DETERRENT AND DOOR LOCK ECU

 1–GROUND:

CONTINUITY WITH LUGGAGE COMPARTMENT DOOR TO UNLOCK POSITION

12–GROUND:  CONTINUITY WITH ENGINE HOOD OPEN
10–GROUND:  CONTINUITY WITH LUGGAGE COMPARTMENT DOOR OPEN
 7–GROUND: 

APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION

T 9

(A)

 

 THEFT DETERRENT AND DOOR LOCK ECU

 1–GROUND: 

APPROX. 12 VOLTS WITH SHIFT LEVER IN N OR P POSITION AND IGNITION SW AT ST POSITION

 2–GROUND: 

APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION

 6–GROUND: 

CONTINUITY WITH IGNITION KEY IN CYLINDER

 7–GROUND: 

CONTINUITY WITH FRONT RH DOOR TO UNLOCK POSITION

 8–GROUND: 

ALWAYS APPROX. 12 VOLTS

10–GROUND:  CONTINUITY WITH DOOR LOCK KEY SW LH TO UNLOCK POSITION
11–GROUND:  CONTINUITY WITH FRONT LH DOOR TO UNLOCK POSITION
12–GROUND:  CONTINUITY WITH FRONT RH DOOR OPENED
13–GROUND:  CONTINUITY WITH FRONT LH DOOR OPENED
14–GROUND:  CONTINUITY WITH DOOR LOCK KEY SW RH TO LOCK POSITION
15–GROUND:  CONTINUITY WITH DOOR LOCK KEY SW RH TO UNLOCK POSITION
20–GROUND: ALWAYS 

APPROX. 

12 

VOLTS

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C14

28

F 9

26

N 1

27

C23

28

F10

28

P 5

31

D 7

30

F14

30

T 1

27

D 8

30

I15

29

T 8

B

29

D 9

30

L 1

29

T 9

A

29

D10

30

L 4

30

T15

29

D11

30

L 5

30

E 5

26

L 6

30

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

2

19

ENGINE COMPARTMENT LEFT

4

22

LEFT KICK PANEL (J/B NO.1 LEFT)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1B

20

ENGINE ROOM MAIN WIRE

1D

20

FRONT DOOR LH WIRE

1E

20

INSTRUMENT PANEL WIRE

1H

1I

20

COWL WIRE

1J

20

COWL WIRE

1K

3A

22

INSTRUMENT PANEL WIRE

3F

22

INSTRUMENT PANEL WIRE

SERVICE HINTS