Lexus SC300 / Lexus SC400. Manual - part 999

48

POWER SOURCE (Current Flow Chart)

*1:  USA
*2:  CANADA

D2 D3

F14

D5

D4

D6

E6

D10

E1

E11

F8 F10

F4

F6

E12

E10

F7

F3

94

126

68
126

90
126

112

216

68

68
126
136
226

104

86

107

D11

F5

E9

E8

Engine

 Oil Level W

arning SW

Diode

(for Parking Brake)

Diode

(for T

ension Reducer)

Door Courtesy Light LH

Door

 Lock 

Motor

, Door Unlock Detection

SW and Door Open Detection SW LH

Day/Night

 Shift SW

E

C

T

 Solenoid

ECT Pattern Select SW

Engine and ECT ECU

Front T

urn Signal Light RH

Fuel Lid Opener SW

Fuel Lid Opener Solenoid

*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

Door Courtesy Light RH

Door

 Lock 

Motor

, Door Unlock Detection

SW and Door Open Detection SW RH

Engine

 ECU

Front T

urn Signal Light LH

Front Side Marker Light RH

Front Side Marker Light LH

Front Clearance Light RH

Front Clearance Light LH

192

216

* 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

49

F16 F18

I1

H8

G2

G1

H1

H3

H2

H4

H5

I2

I14

I15

L7

I16

L2

M2

L6

L3

M4

80

194

111

94

101

62
68

101
112
126

186

154

162

68

68

94

216

90

86

107

H6 H7

H9

98

N1

Unlock

 W

arning SW

[Ignition SW]

Igniter No.1

Fuel Pump ECU

Glove Box Light

Headlight LH HI

Hazard SW

High Mount Stop Light

(w/ Rear Spailer)

Horn LH

ISC

 V

alve

Ignition Key Cylinder Light

Key Inter Lock Solenoid

Moon Roof Control Relay

Light Failure Sensor

Luggage Compartment

Light SW

A/T Indicator SW

Back–Up Light SW

Neutral Start SW

Licence Plate Light

Integration Relay

Fuel Sender

Glove Box Light SW

Headlight RH HI

Headlight LH LO

Headlight RH LO

Horn RH

High Mount Stop Light

(w/o Rear Spailer)

Luggage Compartment

Light SW

Moon Roof Motor

86
98

108

182
216

82
91
94
102

82

216

90
104

(4)

: R/B No. 5 (See page      )

22

50

POWER SOURCE (Current Flow Chart)

*1:  USA
*2:  CANADA

P18

P11

N2

N4

O2

P2

O8

P4

P6

R5

R4

P20

P14

226

154
192

154

190

68

154

90
202

202

P8

P7

184

94

O5

P5

P3

Parking

 Brake SW

Power Window Motor RH

Power Window Motor LH

Oil Pressure SW

Power Seat Control SW

(for Driver

’s

 Seat)

Power Seat Control SW

(for Passenger

’s

 Seat)

Power

 Seat ECU (Passenger

’s

)

Oxygen Sensor Sub

(for California)

Power Seat Motor (for Driver

’s

Lumbar Support Control)

O/D Main SW

Radio and Player

Personal Light

Radio and Player (w/ CD Player)

Noise Filter

(for A/C System)

Power Seat Motor (for Passenger

’s

Reclining Control)

PPS ECU

Power Window Control SW RH

Power Window Master SW and

Door Lock Control SW LH

*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

P9

P12

P10

R2

Power Seat ECU (Driver

’s

)

Noise Filter

(for Defogger System)

216 126

216

208

122

* 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

51

R5 R7

S11

R11

R9

R17

R16

R18

R10

S3 S10

S13

S12

168

90
202
212

208

68

184
216

186

188

S14

T1

T6

S24

216

101

98

104

173
190

173

188

90

216

94

112

Radio

 and Player

(w/o CD Player)

Rheostat

S18

S17

S23

S15 S16

TDCL

Rear T

urn Signal Light RH

[Rear Comb. Light RH]

Back–Up Light LH

[Rear Comb. Light LH]

Stop Light LH

[Rear Comb. Light LH]

Rear T

urn Signal Light LH

[Rear Comb. Light LH]

T

aillight LH

[Rear Comb. Light LH]

Back–Up Light RH

[Rear Comb. Light RH]

Stop Light RH

[Rear Comb. Light RH]

T

aillight RH

[Rear Comb. Light RH]

Stop Light

Seat

 Heater

(for 

Driver

’s

 Seat Back)

Short Connector

Seat Heater SW (M/T)

Remote Control Mirror LH

Remote Control Mirror ECU

Speed Sensor No. 1

Shift Lock ECU

Stereo Power Amplifier

Theft Deterrent Horn

Remote Control Mirror RH

Remote Control Mirror SW

Stop Light SW

Seat Heater

(for 

Driver

’s

 Seat Cushion)

Seat Heater

(for Passenger

’s Seat Back)

Seat Heater

(for Passenger

’s

 Seat Cushion)

86 101

98

86 104

148
154
186

68
98
134
144

134
144
148
178

(4)

: R/B No. 5 (See page     )

22