Lexus SC300 / Lexus SC400. Manual — part 989

OVERALL ELECTRICAL WIRING DIAGRAM

1

2

34

1J
7

1J
31

J

6

22

1B
4

1I

51

K

42

22

22

2

4

AC

C

IG

1

ST

1

IG

2

AM

1

2

1

6

11

A

M

2

3

2

4

1

3

1

4

2

21

21

21

21

16

IE

1

15

IE

1

1

E

B

2

2

1B

T

1

2B

T

1

3

B

T

1

N

P

2

3

2

1

41

3

6

14

7

9

17

B

T

1

21

21

BK

E

B

1J
5

1E

12

7

8

4

15

12

13

1

81

4

25

1

7I

J2

9

IK

2

IK

1

3A
4

3D

13

3B

1A

IK1

IK

1

2

1

M

3

W

W–R

W–

R

W

B–

Y

B–

R

B–

R

B–

Y

B

–

Y

B–

R

B–

R

L–

Y

G–

W

B–

W

B–

O

B–

O

L–

R

W

B–

R

B–

Y

B

Y

B–

O

B–

O

B–

O

B–

O

B–

O

B–

O

G R

–Y

B–

R

B–

Y

B–

O

G

G

B

L–O

L–O

B

R–G

P

G

G

W–B

G

P

R –G

W–B

W–B

L–Y

G–W

Y

Y

W–B

B–

R

B–Y

B–W

B–W

W–R

B–O

B–O

B–O

B–O

B–O

W

W–

B

B–R

3

4

G–W

W–L

LG

B–Y

B–W

G –R

G–Y

LG

L–Y

B–R

G –Y

G–R

LG

GR –Y

B–

O

B–

W

B–

O

B–

R

B–

R

B–

Y

R–

G

L–

Y

G–

W

B

Y

B

B–

Y

B–

R

W

L–

R

B–

Y

LG

GR

–

Y

R–

L

W

TE

1

TE

2

TT

EN

G

OX

2

OX

1

VF

1

FP

+B

5

G

3

B

W

T6

T

D

C

L

C3

C H

EC

KC

O N

N E

C T

O R

E1

CH E

C K

ENG

IN

EW

ARN

IN

G

LIG

H T[

C O

MB

.

M ET

ER ]

10

A

GA

U

G

E

EF

I

MA

IN

RE

L

A

Y

30

A

EF

I

N1

NE

UT

RA

L

ST

AR

T

SW

STAR

TE

R

R E

LA

Y

F1

6

F

U

EL

PU

M

P

E

C

U

BA

TTER

Y

F15

FU

ELPU

MP

30

A

A

M

2

60

A

M

A

IN

120A

ALT

100A

AM

1

30A

IN

J

I1

1

IN

J

E

CT

O

R

No

.

6

I1

0

IN

J

E

CT

O

R

No

.

5

I9

IN

J

E

CT

O

R

No

.

4

I7

IN

J

E

CT

O

R

No

.

2

I8

IN

J

E

CT

O

R

No

.

3

I6

IN

J

E

CT

O

R

No

.

1

From

Sta

rte

r<

1–3>

To

Thef

tD

eter

ren

t

and

D oor

Loc

kE

C U

<1

7–3>

F9

FU

SEBL

OC

K

7.

5A

ST

7.

5

A

IG

N

40

A

IG

S

W

I1

5

IG

N

IT

IO

N

SW

E

ngine

C

ont

ro

l

2

LEXU

S

SC

30

0

GR

–

Y

B–

R

VF

2

TE

1

W

W–

B

B–Y

17

1

8

1

2

345

6

789

1

0

23

22
21
20
19

15
14
13
12

11

16

1

2

34

56

78

9

10

111

2

13

1

4

151

6

1

71

8

AB

CH

E

C

K

E

NG

IN

E

W

A

RN

ING

LI

G

H

T

[C

O

M

B

.

M

E

T

E

R

]

W

C1

4

C

1

3

6I

J

1

1E

B

2

IJ

1

12

B–R

B–

R

E1

3

BR

25

From

Stop

Ligh

tS

W

<5–6

><4

–6>

C 13

IG

–

F

rom

Ig

ni

ter

”T

A

C

”<

1

–

5

>

B

,C

14

A

19

P

BR

1I

J

1

IK1

4

3

B

4

Po

w

e

r

S

our

ce

(C

ont

.

ne

xt

pa

ge

)

F

rom

A

/C

C

o

nt

rol

A

sse

m

b

ly

<

2

2–

7>

<

22

–5

>

TC

A

/C

P–B

P–L

4

11

11

TC

F

rom

A

/C

C

o

nt

rol

A

sse

m

b

ly

<

2

2

–

8

>

P–

B

G–

Y

IG

3

3

B–

R

U

n

der

the

cen

ter

p

illa

r

L

H

Fr

o

n

t

s

id

e

o

f

lef

t

fend

er

7

4

2

1

IJ

2

8

B

B–W

B

C2

3

CL

UT

C

H

ST

AR

T

SW

(A/T

)

(M

/T

)

7I

J1

3I

J1

B–O

B–O

(A/

T)

3

EB1

B

(M/

T)

*

1:

(w

/

T

rac

tion

C

on

tr

o

l)

*

2:

(w

/oT

ra

ct

io

nC

o

n

tr

o

l)

*

3:

(US

A

S

p

e

c.

)

*

4:

(E

x.

U

SA

Sp

e

c.

)

5

6

7

8

EB1

EC

ED

D

D

C

C

C

C

D

C

C

C

C

C

IJ2

IJ2

IG2

EB1

C

D

C

D

C

C

C

C

C

D

D

C

D

D

D

D

D

C

C

C

C

C

ED

1

2

1

2

2

3

1

2

3

1

4

4

2

3

4

5

1

2

5

1

3

4

6

2

B–O

B–W

B–O

B–Y

B–R

B–R

W

R–

L

BR

B–R

B–Y

W

L–R

B–Y

LG

GR–Y

B

Y

B

G–W

L–Y

R–G

P

B–R

B–

R

18

19

17

16

15

46

23

44

34

31

32

34

32

35

33

33

24

2

76

1

37

B

B–

Y

B–

R

W

L–

R

W–

B

W–

B

BR

LG

–B

L–

W

V–

R

G–

Y

B–

Y

B–

O

P

B–

W

B–

O

BR

W

L–

R

B–

R

P

B–

O

BR

BR

#30 #20 #40 #50 #60

THG

ACMG THW

A/C

B–

R

B–

R

B–

R

EB1

Fr

o

m

Sp

e

e

d

S

e

n

so

r

<

2

1–

7>

P–

L

Y–

L

V–

Y

Y–

G

W–

Y

Y–

R

L–R

Y–

B

Y–

G

L–

R

L–R

BR

BR

65

63

42

64

43

38

39

40

58

57

41

45

66

A 9
AIR FLOW METER

F

ro

m

T

rac

tion

E

C

U

<

8

–8>

F

ro

m

Igni

te

r

<

1

–6>

7

P

E2

IDL2

VTA2

IDL1

VTA1

THA

VC

KS

IGT

IGF

VT01

VT02

NEO

TR

IGSW

NSW

SP1

M–REL

BATT

ISC3

ISC1

ISC4

ISC2

+B1

+B

I 1
ISC
VALVE

BR

R–

B

BR

Y–

L

L–R

R

Y

L–R

L–

R

L–

R

BR

L–R

BR

BR

BR

BR

BR

W

G

F

ro

m

M

a

gnet

ic

Cl

u

tc

h

R

e

la

y

<

2

2–1

>

To

A

/C

A

m

p

lif

ie

r

<

2

2–

7>

E3

E

G

R

G

AS

T

E

M

P

.

S

EN

SO

R

E2

EF

I

W

AT

E

R

T

EM

P.

SE

N

SO

R

S 9
SUB THROTTLE
POSITION SENSOR

T 2
THROTTLE
POSITION SENSOR

BR

Engine Control

2 LEXUS SC300(Cont’ d)

ENGINE AND ECT ECU, ENGINE ECU

*1 : (w/ Traction Control)

( *

1

)

( *

2

)

( *

1

)

( *

2

)

(*1)

*2 : (w/o Traction Control)

( *

1

)

To

Tr

a

c

tio

n

E

C

U

<

8–

8>

R–B

R

4

3

11

8

B–

O

BR

( *

3

)

(*3)

*3 : (USA Spec. )
*4 : (Ex. USA Spec. )

E 9

, E10

D

C

BR

Front side of
intake manifold

Rear side of
cylinder head RH

Rear side of
cylinder head RH

C

C

C

1

2

1

2

2

1

C

C

C

C

C

C

D

D

C

C

C

C

D

D

C

D

C

D

D

20

77

27

7

25

26

22

21

80

79

4

69

4

6

29

20

28

19

17

V7

VS

V

( f

o

r

Int

ak

e

C

ont

rol

V

a

lv

e

)

V2

VS

V

(fo

r

E

VAP

)

V1

VS

V

(fo

r

E

G

R

)

BY1

BY1

BY1

BY1

BR

R–

B

( *

4

)

W

( *

4

)

B–

R

BR

–

W

( *

3

)

R–

L

( *

3

)

3

1

4

2

1

2

5

6

IK2

IK2

12

22

C

C

1

O3

O

XY

G

EN

SE

N

S

O

R

MA

IN

N

o

.

1

(ON

F

ro

n

t

S

id

e

)

C

48

71

61

75

74

1

O4

O

XY

G

EN

SE

N

S

O

R

MA

IN

N

o

.

2

(ON

R

e

a

r

S

id

e

)

C

D

1

2

35

47

P2

0

P

O

W

E

R

S

T

EER

IN

G

PR

ES

SU

R

E

SW

IK1

1

IJ1

IJ1

(SH

IEL

D

E

D

)

2

3

4

1

C

C

1

1

49

50

D13
DISTRIBUTOR

(SH

IEL

D

E

D

)

EC

Front side of
intake manifold

G–Y

G–R

8

14

K1

No

.

1

(O

N

F

ront

S

id

e

)

K

N

O

C

K

S

EN

SO

R

K2

No

.

2

(O

N

R

ear

S

id

e

)

BR

BR

BR

W

W

L

B

Y

R

R–

G

P

W–

B

W–

B

G–

W

L–

Y

GR

–

Y

LG

B–

Y

G–

Y

BR

BR

BR

G1

G2

G–

NE

# 10

TT TE2 VF2 TE1 VF1

W STP E1 E11 E02 E01

DI FPC

G1

G2

G–

NE

KNK1

KNK2

STA

ACIS

PS OX2

OX1

HT

OX3

EGR

EVAP

39

G–

R

G–

B

B–

W

BR

–

W

BR

–

W

BR

B–

R

B–

R

B–

R

B–

R

W

BR

–

W

W

R–

L

BR

BR

BR

R–L

W

LG–B

BR

BR

(SHIELDED)

(SHIELDED)

(SH

IE

L

D

ED

)

(SH

IEL

D

ED

)

O 8
OXYGEN SENSOR SUB
(for California)

BR

BR

Y

B

R–L

BR

( *

4

)

( *

4

)

(A/

T

)

OVERALL ELECTRICAL WIRING DIAGRAM

1

2

34

3

LEXU

S

SC

30

0

(C

ont

.

ne

xt

pa

ge

)

4

AC

C

IG

1

ST

1

IG

2

AM

1

2

6

11

A

M

2

1J
7

21

J

3

2

2

1B
4

22

21

I

5

EB1

E

B

2

4

EB1

1

1

IJ

2

3

IJ

2

16

IE

1

9B

S2

B

S1

B

OD

1

8B

S3

80

B

EO

1

79

B

EO

2

42

B

VT

A2

63

B

ID

L

2

23

B

SP

2

3B

SP

2

–

69

B

E1

4B

E1

1

24

A

M–

R

E

L

32

A

+B

1

31

A

+B

33

A

BAT

T

76

B

NS

W

1A

IG

SW

2A

SP

1

41

B

VC

43

B

VT

A1

65

B

E2

64

B

ID

L

1

44

B

TH

W

26

B

G1

25

B

G2

6B

G–

5B

NE

10

A

L

9A

2

4

3

4

2

123

S

e

eE

n

g

in

eC

o

n

tr

o

l

S

y

st

em

<

2

–8

>

S

ee

E

ngi

n

e

C

o

nt

rol

S

yst

e

m

<

2

–

6

>

W–R

W–

R

B–

Y

W–L

W

B–O

W

B–O

B–O

B–R

B–R

B–R

B–O

B–Y

B–O

P

P

B–O

B–Y

BR–Y

W–R

R –L

EB

EE

EE

12

18

A

P

28

A

OD

2

12

A

OD

1

17

A

TT

29

B

VF

1

20

A

TE

1

28

B

VF

2

21

IK

1

22

IK

1

3

4

See

Engi

neC

ont

rol

Sys

te

m <

2–5

>

W

G

G–

O

Y

GR

–

R

W–B

W–B

W–B

BR

BR

W–B

W–B

P

V

BR

BR

W

G

G–O

GR –R

BR–

Y

W–B

G–O

G–O

Y

G –O

W

B–Y

I1

5

IG

N

ITIO

N

S

W

W–

R

W

W

60A

MA

IN

100A

AM

1

120A

ALT

30A

AM

2

30A

IN

J

F9

F

U

SE

BL

O

C

K

40A

IG

SW

EF

I

MA

IN

RE

L

A

Y

30

A

EF

I

7.

5

A

IG

N

3

1

83

B–R

E1

EC

T

SO

L

EN

O

ID

NO .

1

NO .

2

NO .

3

S4

SP

EE

D

SE

N

S

O

R

NO

.

2

(fo

r

E

C

T

)

E8

EC

T

P

A

TTE

R

N

SE

L

E

C

T

SW

From

Com

bin

atio

n

Met

er<

21–4

>

To

Cruis

eCo

ntro

lE

C U

<1

6–3>

See

Engi

neC

ont

rol

Sys

tem

<2

–7>

B–

Y

EN

G

IN

E

AN

D

E

C

T

E

C

U

Po

w

e

r

S

our

c

e

E

C

T

and

A

/T

Indic

a

to

r

BA

T

T

E

R

Y

7

4

91

41

3

6

POW

ER

NO RM

AL

A

19

TE

2

E9

,

E

1

0
BA

EN

G

IN

E

AN

D

E

C

T

EC

U

EN

G

IN

E

AN

D

EC

T

EC

U

F

ront

s

ide

o

f

lef

t

fend

er

R

ear

si

de

of

c

yl