Lexus SC300 / Lexus SC400. Service manual — part 1017

87

EA

BM

E 4

B15

B15

B14

B14

1

2

1

2

1C

2

1E

12

3D

13

3A

4

B

11

A

1

G

G

W–B

G

G

W–B

W–B

Y

Y

V–

G

V–

G

YY

G

G

G

W–

B

W–

B

W–

B

W–

B

G–

R

G–

R

W–

B

W–

B

W–

B

G

G

9

11

3

8

4

1

1

1

2

5

5

G–

R

W–

B

F

R

O

N

T

C

L

EAR

AN

C

E

LI

G

H

T

R

H

LIGHT FAILURE
SENSOR

10A
GAUGE

R

EAR

L

IG

H

T

W

A

RN

ING

L

IG

H

T

[C

O

M

B

.

ME

T

E

R

]

TA

IL

L

IG

H

T

[R

EAR

C

O

M

B.

L

IG

H

T

]

L

ICE

NC

E

P

L

A

T

E

LI

G

H

T

L 3

L2

R11

R10

RH

LH

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

HO

L

D

C

IRC

UI

T

BU1

9

C1

3

,

C

14

B

A

+

–

FR

O

N

T

S

ID

E

M

A

R

K

E

R

LI

G

H

T

R

H

F6

F4

E 1

E 1

B

+PK

–PK

WRN

W–B

88

TAILLIGHT

WHEN THE LIGHT CONTROL SW IS TURNED TO TAIL OR HEAD POSITION. THE CURRENT FLOWS TO TERMINAL 3 OF THE LIGHT
FAILURE SENSOR THROUGH THE TAIL FUSE.

WHEN THE IGNITION SW IS TURNED ON, THE CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 8 OF THE LIGHT FAILURE
SENSOR, AND ALSO FLOWS THROUGH THE REAR LIGHT WARNING LIGHT TO TERMINAL 4 OF THE LIGHT FAILURE SENSOR.

TAILLIGHT DISCONNECTION WARNING

WITH THE IGNITION SW ON AND THE LIGHT CONTROL SW TURNED TO TAIL OR HEAD POSITION. IF THE TAILLIGHT CIRCUIT IS
OPEN, THE LIGHT FAILURE SENSOR DETECTS THE FAILURE BY THE CHANGE IN CURRENT FLOWING FROM TERMINAL 3 OF THE
LIGHT FAILURE SENSOR TO TERMINAL 9, 11 AND THE WARNING CIRCUIT OF THE LIGHT FAILURE SENSOR IS ACTIVATED.

AS A RESULT, THE CURRENT FLOWS FROM TERMINAL 4 OF THE LIGHT FAILURE SENSOR

→

TERMINAL 11

→

GROUND AND TURNS

THE REAR LIGHT WARNING LIGHT ON, WHICH REMAINS ON UNTIL THE LIGHT CONTROL SW IS TURNED OFF.

TAILLIGHT RELAY

5–3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION

L 3

LIGHT FAILURE SENSOR

4, 8–GROUND: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
3–GROUND: APPROX. 12 VOLTS WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
11–GROUND : ALWAYS CONTINUITY

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C13

B

28

F 5

26

L 2

30

C14

A

28

F 6

26

L 3

30

C15

28

F 9

26

R10

31

F 3

26

I16

A

29 (USA)

R11

31

F 4

26

I16

B

29 (CANADA)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1A

20

ENGINE ROOM MAIN WIRE

1B

20

ENGINE ROOM MAIN WIRE

1C

20

FLOOR WIRE

1E

20

INSTRUMENT PANEL WIRE

1J

20

COWL WIRE

1K

20

COWL WIRE

3A

22

INSTRUMENT PANEL WIRE

3D

22

INSTRUMENT PANEL WIRE

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

BU1

40

FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

EA

34

FRONT SIDE OF RIGHT FENDER

IF

36

LEFT KICK PANEL

BM

40

BACK PANEL CENTER

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

E 1

E11

34

ENGINE ROOM MAIN WIRE

E 4

34

ENGINE ROOM MAIN WIRE

B14

40

FLOOR MAIN WIRE

E 5

34

ENGINE ROOM MAIN WIRE

B15

40

FLOOR MAIN WIRE

SYSTEM OUTLINE

SERVICE HINTS

89

112

THEFT DETERRENT AND DOOR LOCK CONTROL

2

1I

14

1K

13

1K

11

2

3A

1

1J

1

1B

2

2

1H

13

3F

7

1E

18

1I

16

4

4

1D

8

1H

10

1B

5

1D

10

I 8

I11

I11

B 4

9

10

1

2

IE1

6

IG1

17

IF2

15

IF2

14

IF2

16

IF2

18

IF2

5

IF2

4

IF2

7

B

13

TAIL

B

5

HEAD

A

2

IG

B

7

ACC

A

20

+B1

A

16

E

A

6

KSW

A

19

TSW

A

14

L1

A

10

UL3

A

13

DSWD

A

11

LSWD

A

17

L2

A

18

UL2

1

1

3

6

4

7

2

4

2

3

1

8

2

1

IF

2

1

M

6

4

5

3

1

2

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

60

A

M

A

IN

12

0A

A

LT

1

00A

A

M

1

LO

C

K

UN

L

O

C

K

LO

C

K

UN

L

O

C

K

15A
ECU–IG

15A
CIG

10A
DOME

HE

A

DL

IG

H

T

RE

L

A

Y

G–Y

G–Y

G–L

R–B

L–W

L–R

W–B

W–B

W–B

W–

L

W

W

B–

R

L–

R

R

R

R–

Y

G–

W

W–

B

Y

L

G–

Y

G

G–

Y

R–

B

W–

L

R–

B

G–

L

R–

B

G–

L

L–W

L–W

R–

W

L–

W

L–

W

R–

B

G–

L

W–

B

L–

R

W–

B

W–

B

W–

B

G

G–

Y

L

W–

B

W–

B

W–

B

R–

Y

TA

IL

L

IG

H

T

RE

L

A

Y

W–L

W

TO

F

U

S

E

”

1

5

A

TA

IL

”

THEFT DETERRENT AND DOOR LOCK ECU

U

N

L

O

CK

W

A

RN

IN

G

S

W

[IG

N

IT

IO

N

S

W

]

L

U

GGA

G

E

C

OM

P

A

R

T

M

E

N

T

D

O

O

R

O

PEN

ER

S

W

D

OOR

K

E

Y

L

OC

K

A

N

D

U

N

LO

C

K

S

W

LH

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

L

H

P

O

W

E

RW

IN

D

O

W

M

A

S

T

E

RA

N

D

DO

O

R

L

O

C

K

CO

NT

R

O

L

S

W

L

H

FUSE BLOCK

L–

R

BATTERY

F 9

I15

L1

D7

D1

0

P5

T 8

,

T 9

B

A

DI

O

D

E

3

2

5

1

2

W–

B