Lexus SC300 / Lexus SC400. Manual - part 1000

52

POWER SOURCE (Current Flow Chart)

*1:  USA
*2:  CANADA

T9

T19

T11

T12

T10

W5

V3

V5

V6

W3

W2

188

112
194

204

200

162

216

V4

200

112

90

134

68

156
192

226

94

VSV (for EV

A

P

)

T

ension Reducer

Solenoid LH

Theft

 Deterrent and 

Door Lock ECU

T

ilt and power

T

elescopic ECU

Seat Heater SW (A/T)

T

raction Cut SW

T

ri

p

 SW and 

Theft Deterrent Indicator

T

elephone T

ransceiver 

and

Speaker Relay

T

ension Reducer

Solenoid RH

VSV

(for EGR)(EX. California)

W

asher Level SW

V

anity Light LH

V

anity Light RH

W

asher Motor

W

ater T

emp Sender

Wiper Motor

VSV (

for W

ater V

alve)

VSV (

for Fuel Pressure Up)

*Page Nos. of 
 Related Systems

Parts

Code or
Location

CB or Fuse

50A

DEFOG

30A

DOOR

30A

POWER

15A

STOP

15A

ECU–B

10A

MIR–HTR

10A

HEATER

20A

TURN

20A

WIPER

10A

GAUGE

15A

ECU–IG

7.5A

ENGINE

7.5A

IGN

15A

CIG

7.5A

RADIO No.2

15A

TAIL

7.5A

PANEL

7.5A

ST

15A

TEL

10A

DOME

20A

RADIO No.1

25A

HAZ–HORN

30A

EFI

7.5A

ALT SENCING

15A

HEAD LH*1

15A

HEAD RH*1

15A

HEAD LH–LWR*2

15A

HEAD RH–LWR*2

15A

HEAD LH–UPR

15A

HEAD RH–UPR

60A

HEATER

7.5A

TRAC

15A

SEAT–HTR

Location

216

90
216

T

raction ECU

T

raction ECU

W1

V1

V2

T18

T16

T15

T14

T13

T8

* These are the page numbers of the first page on which the related system is shown.

The part indicated is located somewhere in the system, not necessarily on the page indicated here.

[LOCATION]

(1)

: J/B No. 1 (See page 

20

)

(2)

: R/B No. 2 (See page 

19

)

(3)

: R/B No. 4 (See page 

23

)

20

19

22

53

118

104

226

62
68
112

208
212

226

102

94

W7 W8 W10

Wireless

 Door Lock

Main SW

Wireless Door Lock ECU

W

oofer Speaker Amplifier

Power Main Relay

A/C Magnetic Clutch Relay

EFI Main Relay

Heater Relay

Defogger Relay

T

urn Signal Flasher

Horn Relay

Diode

Cornering Light Relay

Starter Relay

112
194

68
126

190
226

102

111
112

Diode

(4)

: R/B No. 5 (See page      )

22

56

POWER SOURCE

AM

2

AM

1

AC

C

IG

1

IG

2

3

2

1

6

4

11

ST

1

1B

2

1J

5

1J

6

1J

3

1J

8

1K

13

1K

4

1J

4

1B

4

1J

7

I24

I33

I11

P

N

2

3

IE1

16

IJ1

6

3

4

2

13

14

5

9

7

11

6

W

W

B

B

B

B–R

B–W

B–W

W–L

B

B–O

P–L

B

B

B

W–

L

R

W–

R

W–

R

B

W–

R

Y

W–

L

W–

R

W

W–

R

B–

Y

B–

W

P–

L

B–

O

B–

W

B–

W

B–

W

B–

W

W

B–R

15A ECU–B

15A STOP

30A POWER

30A DOOR

TAILLIGHT
RELAY

15A TAIL

7. 5A PANEL

BATTERY

15A ECU–IG

7. 5A ENGINE

20A WIPER

10A GAUGE

20A TURN

10A HEATER

7. 5A ST

7. 5A IGN

15A CIG

7. 5A RADIO NO. 2

40A
IGSW

NEUTRAL
START SW

T

O

EN

G

IN

E

AN

D

EC

T

E

C

U

TO CRUISE CONTROL ECU

T

O

ABS

A

C

T

U

AT

O

R

R

EL

A

Y,

A

B

S

M

OT

OR

R

E

L

A

Y

A

N

D

T

R

AC

T

IO

N

BR

A

KE

AC

T

U

A

T

O

R

R

E

L

AY

T

O

A

L

TE

R

N

A

TO

R

”

B

”

IG

NIT

IO

N

S

W

FUSE BLOCK

TO TRACTION MOTOR RELAY

10

0A

A

M

1

60

A

A

B

S

N

O

.

1

30

A

IN

J

12

0A

A

LT

30A

A

M

2

30

A

A

B

S

N

O

.

2

60A

MA

IN

F 9

N 1

I1

5

5

1

3

2

2

6

3

4

1

5

1

2

IJ2

8

B

B–

W

B

B

(M/T)

(M/T

)

C2

3

CL

UT

CH

S

T

A

R

T

S

W

(A/

T

)

57

8

7

6

5

4

3

2

1

10

9

12

11

14

13

2

1

22

21

20

19

18

17

16

15

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

IF

4

1B

1

4

4

2

2

4

4

EB1

3

W

B

B

B

B–R

R–L

B

B

L–O

R–Y

L–R

W

R

B–Y

W

L–Y

W–L

R

R

R

R–G

R–B

R–W

B

R–Y

B

B

B–R

2

B

W–

B

B

R

1

2

1

2

1

2

2

4

3

1

1

3

4

3

1

3

5

2

2

4

4

3

5

3

4

20A RADIO NO. 1

25A HAZ–HORN

30A EFI

10A DOME

15A TEL

7. 5A ALT SENCING

7. 5A TRAC

HEADLIGHT
RELAY

STARTER
RELAY

60A HEATER

50A DEFOGGER

DEFOGGER
RELAY

15A SEAT–HTR

15A HEAD (LH–UPR)

15A HEAD (RH–UPR)

15A HEAD (LH) (FOR USA)
15A HEAD (LH–LWR) (FOR CANADA)

15A HEAD (RH) (FOR USA)
15A HEAD (RH–LWR) (FOR CANADA)

DIMMER
RELAY

SEAT HEATER
RELAY

10A MIR–HTR

W–B

I 1

W–B

B

(M/

T

)

(A/

T

)

(CA

NA

DA

)