Lexus ES300 (2002 year). Manual — part 6

120

Light Auto Turn Off

1

120A
ALT

1

2E

1

2

3

1

5

2

40A
MAIN

1

5

2

3

10A
ECU–B

From Power Source System (See Page 56)

10A
ECU–IG

5A
ECU–ACC

OFF

Tail

Head

AUTO

Li

ght

C

ont

ro

l S

W

A

8

A

9

B

14

A

IB

A

16

14

13

12

TAIL
Relay

HEAD
Relay

14

15

1

9

10

TAIL

HEAD

AUTO

2R

8

2B

11

12

24

GND

SGND

Combination SW

C11

IA

ID

Junction
Connector

J 4

TRLY

HRLY

B

SIG

ACC

1

B–

G

B–

G

R

R–

Y

W

W–

B

BR

W–

B

B–

G

W–B

Body ECU

B 4(A), B 5(B), B 6(C)

FL MAIN
3. 0W

Battery

1

2

C

1

DCTY

R–

G

IA2

6

1

D

oor

C

o

u

rte

sy

S

W

F

ron

t LH

D 8

R–

G

1H

11

2F

3

R–

B

121

1. Normal Lighting Operation

<Turn taillight on>
With the light control SW turned to TAIL position, a signal is input into TERMINAL (A) 8 of the body ECU. Due to this signal,
the current flowing to TERMINAL 14 of the ECU flows to TERMINAL (A) 8 to TERMINAL 14 of the light control SW to
TERMINAL 16 to GROUND, and TAIL relay causes taillights to turn on.

<Turn headlight on>
With the light control SW turned to HEAD position, a signal is input into TERMINALS (A) 8 and (A) 9 of the body ECU. Due to
this signal, the current flowing to TERMINAL 15 of the ECU flows to TERMINAL (A) 9 to TERMINAL 13 of the light control
SW to TERMINAL 16 to GROUND in the headlight circuit, and causes taillight and HEAD relay to turn the lights on. The
taillight circuit is same as above.

2. Light Auto Turn Off Operation

With light on and ignition SW turned off (Input signal goes to TERMINAL 9 of the ECU), when the driver’s door is opened
(Input signal goes to TERMINAL (C) 1 of the ECU), the body ECU operates and the current is cut off which flows from
TERMINAL 14 of the ECU to TERMINAL (A) 8 In taillight circuit and from TERMINAL 15 to TERMINAL (A) 9 in headlight
circuit.
As a result, all lights are turned off automatically.

TAIL Relay

5–3 : Closed with the light control SW at HEAD or TAIL position

HEAD Relay (w/ Daytime Running Light)

5–3 : Closed with the light control SW at HEAD position or dimmer SW at FLASH position

Closed with the engine running and parking brake released (Parking brake SW off)

HEAD Relay (w/o Daytime Running Light)

5–3 : Closed with the light control SW at HEAD position or dimmer SW at FLASH position

Body ECU

9–Ground : Approx. 12 volts with ignition SW at ON or ST position

12, 24–Ground : Always continuity

1–Ground : Always approx. 12 volts

D8 Door Courtesy SW Front LH

1–Ground : Closed with the driver door open

: Parts Location

Code

See Page

Code

See Page

Code

See Page

B4

A

38

B6

C

38

D8

40

B5

B

38

C11

38

J4

39

: Relay Blocks

Code

See Page

Relay Blocks (Relay Block Location)

1

22

Engine Room R/B (Engine Compartment Left)

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

1H

25

Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

2B

28

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

2E

28

Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)

2F

28

Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)

2R

29

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IA2

46

Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)

System Outline

Service Hints

122

Light Auto Turn Off

: Ground Points

Code

See Page

Ground Points Location

IA

46

Instrument Panel Reinforcement LH

IB

46

Instrument Panel Brace LH

ID

46

Instrument Panel Brace RH

124

Automatic Light Control

1

120A
ALT

1

2E

1

2

3

1

5

2

40A
MAIN

1

5

2

3

10A
ECU–B

From Power Source System (See Page 56)

10A
ECU–IG

5A
ECU–ACC

OFF

Tail

Head

AUTO

Li

ght

C

ont

ro

l S

W

A

8

A

9

B

14

A

IB

A

16

14

13

12

B

15

B

16

B

17

TAIL
Relay

HEAD
Relay

14

15

1

9

10

TAIL

HEAD

AUTO

CLTB

CLTE

CLTS

2R

8

2B

11

12

24

GND

SGND

6

3

5

Combination SW

C11

Automatic Light Control
Sensor

A18

IA

ID

Junction
Connector

J 4

TRLY

HRLY

B

SIG

ACC

1

B–

G

B–

G

R

R–

Y

W

V–

Y

GR

–

R

P–

L

W–

B

BR

W–

B

B–

G

W–B

CLTB

CLTE

CLTS

Body ECU

B 4(A), B 5(B)

FL MAIN
3. 0W

Battery

1

2

2F

3

1H

11

R–

B