Lexus ES300 (2002 year). Manual — part 7

125

The automatic light control system works when the light control SW is turned to AUTO. The automatic light control sensor
detects the brightness around the vehicle. By this function, the system automatically turns the taillight and headlight on if the
brightness is below the regular level and turns the taillight and headlight off when the surroundings become brighter than the
regular level.

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 : Driver’s door open

: Parts Location

Code

See Page

Code

See Page

Code

See Page

A18

38

B5

B

38

J4

39

B4

A

38

C11

38

: 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)

: 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

System Outline

Service Hints

126

Key Reminder

10A
ECU–B

From Power Source System (See Page 56)

10A
ECU–IG

5A
ECU–ACC

1

9

10

2M

8

2B

11

24

SGND

IA

B

SIG

ACC

Body ECU

B 4(A), B 6(C)

10A
GAUGE1

2M

1

2M

6

A

40

A

20

A

21

B

15

A

1

Buzzer

Power

3A

57

3A

56

3A

87

3A

86

3B

54

3B

74

3B

84

3B

64

ID

C

1

IA2

6

1

1

2

A

19

3B

26

3B

46

3B

47

3B

27

2R

8

12

GND

U

n

lo

ck W

a

rn

in

g

S

W

U 1

Door Courtesy SW
Front LH

D 8

(* 1)
(* 2)

(* 1)
(* 2)

C

o

m

b

inat

ion Met

e

r

C 7

(A

), C 8

(B

)

KW

DCTY

(* 1)
(* 2)

(* 1)
(* 2)

W

W

W

SB

W–

B

BR

W

LG

LG

R–

G

R–

G

LL

W

BR

BR

W–

B

KSW

* 1 : w/ VSC
* 2 : w/o VSC

3A

55

3A

75

W–

B

Micro Computer

127

Key Reminder System

With the ignition key inserted in the key cylinder (Unlock warning SW on), the ignition SW still off and driver’s door open
(Door courtesy SW on), when a signal is input to TERMINAL (C) 1 of the body ECU, the body ECU operates, current flows
from TERMINAL (A) 1 of the ECU to TERMINAL (B) 15 of the combination meter to GROUND and key reminder buzzer
sounds.

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

U1 Unlock Warning SW

1–2 : Closed with the ignition key in cylinder

: Parts Location

Code

See Page

Code

See Page

Code

See Page

B4

A

38

C7

A

38

D8

40

B6

C

38

C8

B

38

U1

39

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

2B

28

2M

29

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

2R

29

(

)

3A

34 (w/ VSC)

3A

35 (w/o VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

34 (w/ VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

35 (w/o VSC)

: 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)

: Ground Points

Code

See Page

Ground Points Location

IA

46

Instrument Panel Reinforcement LH

ID

46

Instrument Panel Brace RH

System Outline

Service Hints

128

Theft Deterrent and Door Lock Control

Body ECU

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

2E

1

25

A

D

O

O

R

N

O

. 2

1

2

19

1

120A
ALT

(*2)

(* 1)

(*1)

(* 2)

3B

3B

27

47

12

GND

A

KSW

L

3B

3B

26

46

2

1

L

L

3B

3B

36

56

3A

75

55 3A

2R

8

8 2M

W–

B

S

B

W

–

B

U

n

lo

ck Wa

rn

in

g

S

W

U 1

3

BDR2

From Power Source System (See Page 56)

1

5

2

3

TA

IL

R

e

la

y

14

TRLY

1

5

2

3

2

3

1

5

HO

RN Re

la

y

H

EAD

R

e

la

y

2G

22

2F

3

13

HORN

15

HRLY

1

0

A

HO

RN

40

A

M

A

IN

2

1

G–

B

R–

B

G–

B

R–

B

1D

3

1H

11

2P

8

* 2 : w/o VSC

* 1 : w/ VSC

W–B

B–

G

B–

G

W–B

L