Lexus SC300 / Lexus SC400. Manual - part 990

OVERALL ELECTRICAL WIRING DIAGRAM

1

2

34

4

LEXU

S

SC

30

0

1J
7

22

1

J

81

B

2

4

1B
5

1B
4

1K

11

22

2

2

44

1I

1E

3

4

1

2

2

3

1

5

4

AC

C

IG

1

ST

1

AM

1

3

2

1

2

1

2

1

2

1

2

19

IE

1

1

2

IE

1

5I

E

1

6I

E

1

9I

G

1

4

7

6

4

19

1

5

1

3

20

1

6

2

18

4

97

3

1

3

6

7

IJ

1J
5

3A

1E

1C

1A

1I

15

1C

1F

1K

3D

7B

1A

2

1

9

10

BK

IF

1H

1

K

1J

1E

W–

B

Y

Y

G–

O

G

G

W–

L

Y

Y

W–

B

R–

Y

W–

G

G–

W

W–

L

W –L

W–L

W

W–B

R –W

W–B

R

L–W

P–B

G–L

R –W

R –W

BR–

W

B–L

B–L

W–B

W–B

W–B

W–B

W–B

W–B

W–B

R –W

R –W

R –W

R –W

R –W

R–B

R–B

W

G –W

G –W

W

P–L

W –L

G

G

P–L

B–Y

W

R –Y

R–L

R

Y

V

Po

w

e

r

S

our

c

e

F9

FU

S

E

B

L

O

C

K

60A

MA

IN

100A

AM

1

120A

ALT

W

R–Y

40

A

IG

S

W

LO

H I

H I

LO

H EAD

LIG

HT

LH

H EAD

LIG

HT

RH

HEA

D LI

GH

T

RELA

Y

From

C onne

rrin

gLi

ght

Rel

ay<

7–2>

D IO

DE

10A

D O

ME

7.5

ARA

DIO

N o.

2

LIG

H T

CO NT

RO L

DIMME

R

OF

F

TA

IL

HE

A

D

LO

W

HI

G

H

FL

A

S

H

HU

HF

F

L

E

D

T

H

E

L

C1

5

CO

M

B

INA

T

IO

N

S

W

BA

TTER

Y

C13

HIG

HBEA

M

IN

DIC

AT

OR

LIG

H T

[C O

M B

.

ME

TE

R ]

To

Door

Lock

Mot

ora

nd

U nl

ock

Det

ect

io

nS

Wa

nd

D oo

rO

pen

D et

ect

ion

SW

LH

<17–

5><1

7–6

>

To

Door

Lock

Mot

ora

nd

U nl

ock

Det

ect

io

nS

Wa

nd

D oo

rO

pen

D et

ect

ion

SW

R H

<1

7–6>

Fro

mO

penD

oor

Warn

ing

Lig

ht

Fro

mP

erson

alLi

ght<

6–2

>

B4

BAC KL

ES

WL

H

I15

U N

LO

C K

WA

RN

IN

GS

W

[IGN

IT

IO

NSW

]

SEAT

BELT

WA

RN

IN

G

LIG

HT

[C

O M

B.

MET

ER]

51

1

8

TAIL

LIG

H T

RELA

Y

T

o

T

hef

t

D

e

ter

ren

t

and

Do

o

r

L

o

c

k

E

C

U

<

1

7–3

>

7.5

AP

AN

EL

15A

TA

IL

10

A

GA

U

GE

3

12

2

13

4

Y

BEL

T

H–

L

P

B

A

CC

T

R

L

Y

IN

T

B

IG

BK

L

KE

Y

12

12

9

To

Thef

tD

eter

rent

and

D oor

Loc

kE

CU

<17

–3>

I1

5

IG

N

IT

IO

N

SW

I1

6

IN

T

E

G

R

AT

IO

N

R

EL

AY

H

T

G –L

R–G

1

3

2

B–Y

G–O

1C

16

D IO

DE

1E
1

9

C 12

,C

14

A

B

6

Fro

mT

ension

Redu

cer

Sole

noid

LH<

11–7

>

From

Thef

tD

eter

ren

tan

d

D oor

Loc

kE

C U

<17

–2>

From

D ay

/N

ig

htS

hift

SW

<1

2–1>

From

Tilt

andP

ow

erT

eles

cop

ic

EC

U<

11–1

>

Y

Y

B–L

W–B

5C

4C

CC

3

11

1

1

2

7

64

28

5

1

0

GN

D

IN

T

E

G

R

A

T

IO

N

R

EL

AY

SE

AT

BE

L

T

W

A

R

N

IN

G

L

IG

H

T

[C

O

M

B.

M

E

T

E

R

]

12

345

6

10

11

12

13

17

1

8

19

2

0

21

12

34

5

6

78

9

14

15

1

6

17

18

1

2

34

5

6

78

9

10

23

22
21
20
19

15
14
13
12

11

16

C

A

B

I1

6

C1

2

C1

4

H

eadlight

and

Light

A

u

to

Tur

n

O

ff

(fo

r

U

SA

)

U

nlock

and

S

eat

B

elt

War

ni

ng

(fo

r

U

SA

)

(C

ont

.

ne

xt

pa

ge

)

2

1

1I

3

R –Y

R–

Y

C

6

C
21

Y

R

igh

t

ki

c

k

pa

nel

U

nd

er

the

c

ent

er

p

ill

ar

LH

Le

ft

k

ic

k

p

ane

l

IG

1

8

15

A

HE

A

D

RH

15

A

HE

A

D

LH

W–B

R

R

R

R

R

R

6B

a

2

Ba

1

11

5B

a

2

Ba

1

12

( w/

M

E

M

O

R

Y

)

(w/

o

M

E

M

O

RY

)

(w/

M

e

m

o

ry

)

(w

/o

M

em

or

y

)

5

6

7

8

4 LEXUS SC300(Cont’ d)

1

2

1

2

1 D

11 E

1I

10

3G

1

1B

2

3A

9

1C

10

1E

20

1H

1

9 BU1

1 Bd1

5 IG7

11 Bc1

Be1

2

1

1

2

3A

10

1

2

3

8

4

9

2

11

1

7

3G

8

3A

2

3A

1

2

1

2

1

1

4

1

2

1

2

EA

BM

BL

2 Bd1

4

1

3

8

2

10

3H

3

3C

3

3F

2

3G

5

3H

1

3F

6

1

2

1

3

2

2

9

5

1

10

F

5

G

IQ1

2

6

7

IQ1

4

12

3A

9

3E

6

3E

6

3E

6

3H

2

3H

1

3H

1

2

10

11

1

2

G

W–G

G

G

G

W–G

W–G

W–G

G

W–G

G–O

G–O

G–O

G–O

G–O

W–G

W–G

W–G

W–G

W–G

W–G

G–

W

W–B

Y

Y

G–O

G

G

W–L

G

G

G

G

W–B

W–B

W–B

W–B

G

Y

V–

G

V–

G

Y

G–

W

G–

W

W–B

GG

G

G

G

W

G–

W

G–

W

B

W–

B

R–

W

B

G–

W

G

–

W

G–

O

G–

O

W–

B

W

W–G

BR

Y–

V

L–B

L

W–B

W–

B

W–

B

W–B

W–B

G

G

W–

G

W

–

G

W–B

–PK

–STP

E

HS

+STP

E

TC

RL

RV RE ILL–

7

G–

O

G–

O

+PK

B

WRN

T

15A
STOP

F 3
LH

F 4
RH

FRONT
CLEARANCE LIGHT

L 3
LIGHT FAILURE SENSOR

RE

A

R

L

IG

H

T

W

A

R

NI

NG

L

IG

H

T

[C

O

M

B

.

M

ET

ER

]

S1

2

S

T

OP

L

IGH

T

S

W

T

o

A

B

S

E

C

U

<8

–

3

><9

–

4

>

T

o

S

h

ift

L

o

ck

E

C

U

<

1

5–

2>

G2

GL

OV

E

B

O

X

LI

G

H

T

S

W

F 5
LH

F 6
RH

FRONT SIDE
MARKER LIGHT

L 2
LICENCE
PLATE LIGHT

W–

B

W–B

W–B

H9

HI

G

H

M

O

U

NT

S

T

OP

L

IGH

T

H 8
HIGH MOUNT
STOP LIGHT

A 1
A/C CONTROL
ASSEMBLY

A15
A/C CONTROL SW
AND RADIO SW

RADIO AND PLAYER
(w/o CD Player)

R 4
RADIO AND PLAYER
(w/ CD Player)

T12
TRACTION CUT SW AND
SEAT HEATER SW

C11
CIGARETTE LIGHTER

A21
A/T INDICATOR LIGHT

E 8
ECT PATTERN
SELECT SW

T15
TRIP SW AND THEFT DETERRENT
INDICATOR LIGHT

R 9
RHEOSTAT

G1

GL

OV

E

B

OX

5

5

1

3

1

3

W–B

W–B

W–B

W–B

W–B

R–

W

G–

R

R–

W

G–

R

G–

R

TAIL AND
STOP LIGHT
[REAR COMB.

LIGHT]

R10
LH

R11
RH

TA

IL

ST

O

P

TA

IL

ST

O

P

T

o

E

ng

in

e

an

d

E

C

T

E

C

U

<

2–3

>

T

o

T

ra

ct

ion

E

C

U

<

8–

8>

T

o

C

rui

se

C

on

tr

o

lE

C

U

<

1

6–

4>

To Cruise control
ECU<16–4>

T

o

P

o

we

r

S

e

a

t

E

CU

(Dri

ve

r’

s

)<

1

1–5

>

G–

W

G–W

( *

1

)

( *

2

)

( *

2

)

(*1)

C1

3

,

C

1

4

ED

H

H

H

H

I

3C

1

17

2

3

4

5

COMBINATION METER

C12

, C14

I

H

R 5

, R 6

F

G

1 2

3 4

5 6 7 8 9 10

1

2

3 4 5 6

RADIO AND PLAYER(w/o CD Player)

Taillight and Stop Light(for USA)

Illumination(for USA)

*2 : (w/o Rear Spoiler)

*1 : (w/ Rear Spoiler)

W

G–

W

G–

O

Front side of
right fender

Under the
center pillar RH

Back panel center

2

3

G

W–

G

H 7
HAZARD SW

10 11 12 13

17 18 19 20 21

1 2 3 4 5

6 7 8 9

14 15 16

17 18

1

2 3 4 5

6 7 8 9 10

23

22

21

20

19

15

14

13

12

11

16

C12

I

C14

H

COMBINATION METER

REAR LIGHT WARNING
LIGHT[COMB. METER]

OVERALL ELECTRICAL WIRING DIAGRAM

1

2

34

5

LEXU

S

SC

30

0

1J
7

22

2

2

1

J

81

B

2

4

1B
5

1B
4

1K

11

22

22

2

2

44

1I

1E

3

1

4

2

3

4

1

2

2

3

1

5

4

AC

C

IG

1

ST

1

AM

1

3

2

1

2

1

2

1

2

1

2

19

IE

1

1

2

IE

1

11

IE

1

5I

E

1

6I

E

1

9I

G

1

4

7

6

4

15

1

9

21

1

3

16

2

0

22

2

18

4

97

3

1

3

6

7

IJ

8I

G

1

1J
5

3A

1E

1C

1A

1I

15

1C

1F

1K

3D

7B

1A

2

1

9

10

BK

IF

1H

1

K

1J

1E

W–

B

Y

Y

G–

O

G

G

W–

L

Y

Y

W–B

R

W–B

W

–

B

R–

Y

W–

G

G–

W

W–

L

W –L

W–L

W

W –B

R–W

W –B

W–B

R

R

LG–B

G–W

L–W

P–B

G–L

R –W

R –W

BR–

W

B–L

B–L

W–B

W–B

W–B

W–B

W–B

W–B

W–B

W–B

W–B

R–W

R–W

R

W–B

R–B

R –W

R –W

R–G

R

W

G –W

G –W

R

R

R

W

P–L

W

G

G

P–L

B–Y

W

R –Y

R–L

R

Y

V

Po

w

e

r

S

our

c

e

F9

FU

S

E

B

L

O

C

K

60A

MA

IN

100A

AM

1

120A

ALT

22

W

R–Y

TH

15

A

HE

A

D

LH

–L

W

R

15A

H E

AD

R H

–LW

R

15A

H E

AD

R H–

UPR

15A

HE

AD

LH

–U

PR

40

A

IG

S

W

H3

LH

H4

R H

H2

R H

H1

LH

HEA

D LI

GH

T(

LO)

HEA

D LI

GH

T(

H I)

D IMME

R

R E

LA

Y

HEA

D LI

GH

T

RELA

Y

From

C onne

rrin

gLi

ght

Rel

ay<

8–7>

D IO

DE

10A

D O

ME

7.5

ARA

DIO

N o.

2

LIG

H T

CO NT

RO L

D IMME

R

OF

F

TA

IL

HE

A

D

LO

W

HI

G

H

FL

A

S

H

E

D

H

L

HU

HF

E

L

T

H

C1

5

CO

M

B

IN

A

T

IO

N

SW

BA

TTER

Y

C13

HIG

HBEA

M

IN

DIC

AT

OR

LIG

H T

[C O

MB

.

M E

TE

R ]

To

Door

Lock

Mot

ora

nd

U nl

ock

Det

ect

io

nS

Wa

nd

D oo

rO

pen

D et

ect

ion

SW

LH

<1

7–1>

To

Door

Lock

Mot

ora

nd

U nl

ock

Det

ect

io

nS

Wa

nd

D oo

rO

pen

D et

ect

ion

SW

R H

<1

7–1>

Fro

mO

penD

oor

Warn

ing

Lig

ht

Fro

mP

erson

alLi

ght<

6–2

>

B4

BAC

KLE

SWL

H

I15

UN LO

CKW

AR

NIN

GS

W

[IG

NIT

ION

SW

]

SEAT

BELT

WA

RN

IN

G

LIG

HT

[C

O M

B.

MET

ER]

51

1

8

TAIL

LIG

H T

RELA

Y

T

o

T

hef

t

D

e

ter

ren

t

and

Do

o

r

L

o

c

k

E

C

U

<

1

7–3

>

7.5

AP

AN

EL

15A

TA

IL

10

A

GA

U

GE

3

12

2

13

4

Y

BEL

T

H–

L

P

B

A

CC

T

A

IL

IN

T

B

IG

B

KL

KEY

12

2

9

To

Thef

tD

eter

ren

t

and

D oor

Loc

kE

C U

<1

7–3>

I1

5

IG

N

IT

IO

N

SW

I1

6

IN

T

E

G

R

AT

IO

N

R

EL

AY

DI

M

TO

U

T

HF

HU

Y–B

R–L

CH

G

–

P

K

B

Y–G

B

From

Alte

rn

ato

r”

L”<

1–2>

Fro

mP

arki

ngB

rak

eS

W<

21–

2>

1

3

2

B–Y

G –O

1C

16

D IO

DE

1E
1

9

C 12

,C

14

A

B

6

Fro

mT

ension

Redu

cer

Sole

noid

LH<

11–7

>

From

Thef

tD

eter

ren

tan

d

D oor

Loc

kE

C U

<17

–2>

From

D ay

/N

ig

htS

hift

SW

<1

2–1>

From

Tilt

andP

ow

erT

eles

cop

ic

EC

U<

11–1

>

Y

Y

W–B

1

2C

1

1C

5C

CC

C

CC

4

C

2

C

9

8

7

10

13

11

1

1

2

7

64

2

8

1

0

5

GN

D

IN

T

E

G

R

A

T

IO

N

R

EL

AY

SE

AT

BE

L

T

W

A

R

N

IN

G

L

IG

H

T

[C

O

M

B.

M

E

TE

R

]

10

11

12

13

17

1

8

19

2

0

21

12

34

5

6

78

9

14

15

1

6

17

18

1

2

34

5

6

 

 

 

 

 

 

 

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