Lexus ES300 (2002 year). Service 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
F13
T6
B6
C
R15
D17
R16
: Connector Joining Wire Harness and Wire Harness
Code
See Page
Joining Wire Harness and Wire Harness (Connector Location)
IA3
Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)
IB1
Front Door LH Wire and Instrument Panel Wire (Left Kick Panel)
IO4
Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)
IP1
Front Door RH Wire and Instrument Panel Wire (Right Kick Panel)
BA1
Rear Door No.2 Wire and Floor No.1 Wire (Left Center Pillar)
BB1
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
)
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