Lexus SC300 / Lexus SC400. Manual — part 998

44

POWER SOURCE (Current Flow Chart)

The chart below shows the route by which current flows from the battery to each electrical source
(Fusible Link, Circuit Breaker, Fuse, etc.) and other parts.

The next page and following pages show the parts to which each electrical source outputs current.

Taillight
Relay (Point Side)

30A AM2

60A MAIN

50A DEFOG

60A HEATER

7.5 TRAC

40A IG SW

120A ALT

Starter Relay
(Point Side)

Headlight Relay
(Point Side)

30A EFI

15A TEL

10A DOME

20A RADIO No. 1

25A HAZ–HORN

Theft Deterrent and
Door Lock ECU

15A HEAD RH
(USA)

15A HEAD LH
(USA)

Dimmer Relay
(Coil Side)

Starter

15A STOP

Ignition SW
(AM1)

30A DOOR

15A TAIL

Alternator

ABS Motor Relay
(Point Side)

Defogger
Relay

Starter

ABS
Actuator

10A MIR–HTR

15A ECU–B

7.5A PANEL

7.5 IGN

Engine ECU

Traction Brake
Actuator

30A INJ

60A ABS No.1

Traction Brake
Main Relay
(Point Side)

ABS
Actuator Relay

30A POWER

Integration
Relay

100A AM1

Seat Heater
Relay (Point Side)

7.5 ALT SENCING

30A ABS No.2

Headlight Relay
(Coil Side)

Traction Motor
Relay (Point Side)

Traction Pump
and Motor

Dimmer Relay
(Point Side)

Ignition SW
(AM2)

Taillight
Relay (Coil Side)

15A HEAD (LH–LWR)
(CANADA)

15A HEAD (RH–LWR)
(CANADA)

Engine and
ECT ECU

15A HEAD (LH–UPR)
(CANADA)

15A HEAD (RH–UPR)
(CANADA)

ABS and
Traction ECU

Battery

[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

45

Light Control
SW

ABS and
Traction ECU

Diode

Theft Deterrent
and Door Lock ECU

Integration
Relay

Noise Filter
(for Ignition
System

Injector No. 3

Injector No. 4

Igniter

7.5 ST

15A SEAT–HTR

Ignition Coil

Injector No. 1

Injector No. 2

Injector No. 5

Injector No. 6

ABS
Actuator

7.5A ENGINE

15A ECU–IG

10A GAUGE

20A WIPER

20A TURN

10A HEATER

7.5A RADIO No.2

15A CIG

(4)

: R/B No. 6 (See page )

(5)

: Fuse Block (F9 See page

19

)

24

19

46

POWER SOURCE (Current Flow Chart)

*1: USA
*2: CANADA

60
216

226

192

178

226

90

144

134

216

102

202
208
212

90
167

A2

A15

C6

B2

B1

A10

A14

A12

A17

A13

A23 A24 A25 A32

C11

B3

B4

B6

C3

C10

C7

A21

Blower

Resistor

Auto Antenna Motor

And Relay

A/C Magnetic Clutch

Alternator

A/C Control Assembly

A/C Power T

ransistor

A/T Indicator Light

(for Shift Lever)

A/C Control SW and

Radio SW

A

B

S

ECU

ABS and T

raction ECU

Brake Fluid Level SW

Blower Motor

Center Airbag Assembly

Check Connector

Cornering Light LH

Cigarette Lighter

Back–Up Light SW

Buckle SW LH

ABS and T

raction ECU

Cornering Light RH

190
226

226

90
126

226

101

68
134
144
178

* 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.

*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

7.5

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

[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

47

216

182
216

178
216

129

104

144

102

60
90
216

62
68
112
148

104

111

148

148

190

D1

C16

C24

C15

C19

C23

C22

C12
C13
C14

C14

C13

C12

Airbag

W

arning Light

Charge W

arning Light

Dimmer SW [Comb. SW]

Cruise

Control Indicator Light

[Comb. Meter]

A/T Indicator Light

[Comb. Meter]

Combination Meter

Rear Lights W

arning Light

T

urn Signal Indicator Light

[Comb. Meter]

High Beam Indicator Light

[Comb. Meter]

Check Engine W

arning Light

Open Door W

arning Light

T

raction Indicator Light

ABS W

arning Light

[Comb. Meter]

Seat Belt W

arning Light

ABS

W

arning Light and T

raction

Of

f Indicator Light [Comb. Meter]

Coolant Level W

arning Light

Cruise Control ECU

T

urn Signal SW

[Comb. SW]

Wiper and W

asher SW

[Comb. SW]

Choke Coil

Crutch Start SW

Cruise Control Clutch SW

Diode (for Brake Fluid Level)

Light Control SW

[Comb. SW]

Horn SW [Comb. SW]

Combination Meter

Cornering Light SW

[Comb. SW]

C12

80
82
216

216

216

98
86
216

134
216

216

216

184
216

80
90
102

80
90
102

68
94
134

148
216

(4)

: R/B No. 5 (See page )

22