Lexus ES300 (2002 year). Manual - part 53

86

Multiplex Communication System (Communication Bus)

B

11

IB1

13

IB1

12

B

12

19

IP1

IP1

18

B

13

C

5

6 BA1

B

1

6 BB1

MPX1

MPX2

MPX3

MPX5

MPX4

MPX2

MPX2

MPX1

MPX1

MPX1

MPX1

MPX1

8

8

7

7

10

8

8

GR

–

B

GR

–

R

IA3

10

IO4

10

D

ri

v

er

 D

oor

 E

C

U

D1

7

T

hef

t D

e

ter

rent

EC

U

T 6

F

ront

 P

a

s

s

enger

D

oor

 E

C

U

F1

3

R

ear

 D

oor

LH

 E

C

U

R1

5

R

ear

 D

oor

RH E

C

U

R1

6

GR

–

B

GR

–

R

V

LG

–R

GR

–

G

GR

–

G

LG

–R

GR

–

L

GR

–

L

LG

–R

GR

–

G

GR–L

Body ECU

B 5(B), B 6(C)

87

The multiplex communication system communicates among the body ECU, driver door ECU, front passenger door ECU,
rear door LH ECU, rear door RH ECU and theft deterrent ECU and controls the following systems according to the signals
from respective sensors or switches.

Multiplex Communication System Includes Following Systems

∗

 Automatic Light Control

∗

 Door Lock Control

∗

 Garage Door Opener

∗

 Headlight (w/ Daytime Running Light)

∗

 Headlight (w/o Daytime Running Light)

∗

 Interior Light

∗

 Key Reminder

∗

 Light Auto Turn Off

∗

 Luggage Compartment Door Opener

∗

 Moon Roof

∗

 Power Window

∗

 Theft Deterrent

∗

 Wireless Door Lock Control

  :  Parts Location

Code

See Page

Code

See Page

Code

See Page

B5

B

38

F13

40

T6

39

B6

C

38

R15

41

D17

40

R16

41

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IA3

46

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

IB1

46

Front Door LH Wire and Instrument Panel Wire (Left Kick Panel)

IO4

48

Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)

IP1

48

Front Door RH Wire and Instrument Panel Wire (Right Kick Panel)

BA1

50

Rear Door No.2 Wire and Floor No.1 Wire (Left Center Pillar)

BB1

50

Rear Door No.1 Wire and Floor No.2 Wire (Right Center Pillar)

System Outline

88

Multiplex Communication System

2

40A
MAIN

1

Body ECU

B 4(A), B 5(B), B 6(C)

5

1

3

2

4 1F

1H

11

2F

3

15

HRLY

I 2

R–B

R–

B

R–

B

1F

3

3 1G

1G

4

R–

L

DR

L

 N

O

. 2

Re

la

y

1

1

2

3

1

5

1

1

2F

4

16

DRL

R

(*1

)

1F

2

1C

1

10A
HEAD
RH UPR

10A
HEAD
LH UPR

6 1E

1B

11

2

1

1

15A
HEAD
RH LWR

1

2

R–

G

R–

L

1

2

H

eadl

ight

 R

H

 (

Low

)

H 8

2

1

H

eadl

ight

 C

ont

ro

l E

C

U

 R

H

H 4

EB

E 1

1

Headlight LH

(High)

H 5

3

2

V2

V1

B

6

BZR

HEAD
Relay

IF5

1

1

2

K

e

yle

ss B

u

zze

r

K 1

B

u

zze

r

R

R

(*2

)

R

(*1

)

R

(*2

)

R–

B

R–

Y

(*1

)

R–

W

(*2

)

R–

L

W–

B

W–

B

W–

B

L

R–

W

(*2

)

W–

B

R(*2)

R(*1)

R–B(* 2)

B–Y

R(* 1)

GR

L

(*1

)

(*1

)

(* 1)

(* 3)

R

R–B(* 1)

(*1

)

(*2

)

(*2

)

R–

G

(*1

)

(w/

o

 HI

D

)

(w/ HI

D

)

(w/ HI

D

)

(w/

o

 H

ID

)

(w/

 H

ID

)

K

e

yle

ss B

u

zze

r

O

n

/O

ff S

W

K 4

From Power Source System (See Page 56)

R–B

R–B(* 1)

R–W(* 2)

R–Y(* 1)

R–L

(* 2)

(* 2)

H

e

a

d

light

 B

eam

Le

v

e

l C

o

n

tr

o

l 

E

C

U

89

1

1

15A
HEAD
LH LWR

2

1

1

5A
DRL

2

R

1

2

H

eadl

ight

 L

H

 (

Lo

w

)

H 6

2

1

H

eadl

ight

 C

ontr

o

l 

E

C

U

 LH

H 3

E 4

IF5

6

1

3

2

5

1

3

2

5

4

1

1

1

1

DRL

 NO

. 4

 Re

la

y

DRL

 NO

. 3

 Re

la

y

1

1

1

1

1

2

1

E 4

EC

Headlight
RH (High)

H 7

2G

9

IF7

10

R–

B

HU

17

10 2G

(*2

)

R–

B

(*2

)

6 2N

6 2R

R–

Y

(*1

)

3 2A

14

13

8

12

7

16

OFF

Tail

Head

AUTO

Low

High

Flash

OFF

ON

Li

ght

C

ont

ro

l S

W

Di

m

m

e

r S

W

F

og S

W

17

10

11

A

9

A

10

B

14

A

8

2C

10

1

3

2

5

2R

AUTO

HF

HEAD

TAIL

A

F

B

D

B

D

R

R

W–

R

R–

B

R–

B

W–

B

R–

B

W–

B

W–

B

W–

B

R

W–

B

R–

L

W–

L

W–

B

R

R–

Y

R–

B

W

R–W(* 1)

W–B

W–R

R–Y

R–L

Combination SW

C11

J

unc

ti

on

C

o

nnec

tor

J 8

(A

), J

 9

(B

)

R–

Y

R

W–

B

R–

W

(*2

)

(w/

o

 HI

D

)

(w/

 HID

)

(w/ HI

D

)

(w/

o

 HID

)

(*1

)

(*1

)

(*1

)

(*1

)

(* 1)

(* 1)

(*1

)

(*1

)

(*1

)

(*2

)

(*1

)

(* 2)

R

* 3 : w/ Headlight Beam Level Control System

GR

W–B

(*1)

R–

B

(*2

)

W

(*2)

4

FO

G

 R

e

la

y

Body ECU

B 4(A), B 5(B), B 6(C)

W

R

R–L

W–B

(*2)

(USA)

R–B

R–B(* 1)

R–W(* 2)

R–Y(* 1)

R–L

(*2)

(*2)

(* 1)

* 2 : w/o Daytime Running Light

* 1 : w/ Daytime Running Light

E 4

(* 1)

W–B

2

1

IF5

3

W–L(*1)

D

a

y

tim

e R

unni

ng

Li

ght

 R

e

si

s

tor

D1

9

W–

L

(*1

)