Lexus RX300 (MCU15). Manual — part 364
DI3JR–02
I21406
Rear Left and Right Door ECU
Driver and Passenger Door ECU
Body ECU
A/C and Combination Meter Integrated ECU
Center Cluster Integration Panel
Engine & ECT ECU
MPX1
MPX2
MPX+
MPX–
MPX2
MPX1
MPX1
MPX2
MPX1
MPX2
MPX+
MPX–
Except Europe
Europe
MPX–
MPX+
DI–686
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
TERMINALS OF ECU
I19182
Teft Deterrent ECU
Sliding Roof ECU
MPX1
MPX1
Double Lock
Control Relay
MPX2
MPX1
MPX2
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–687
LEXUS RX300 (RM785E)
DI84Y–01
I19268
Front Passenger
Door ECU
MPX1
MPX2
10
F17
11
F17
Y–R
IL1
5
Y–R
IM1
3
Y–R
BB1
11
BB1
10
Y–R
R16
4
R16
5
Rear Right
Door ECU
MPX2
MPX1
W
Y
D11
10
D11
9
W
Double Lock Door
Control Relay
MPX2
MPX1
BD1
4
W
BA1
10
W
R14
4
MPX2
MPX1
R14
5
Rear Left
Door ECU
D12
11
Driver Door
ECU
MPX2
MPX1
D12
10
BA1
11
V
IA2
11
V
IC1
10
IC1
5
Y–R
Y–R
B–O
T5
8
T5
7
MPX1
MPX2
Theft Deterrent ECU
Y–B
IE1
4
Y–R
C12
21
C12
17
Combination
Meter ECU
MPX+
MPX–
Y–B
I17
5
I17
12
Instrument Control
Panel
MPX+
MPX–
Body ECU
MPX1
MPX2
11
B5
20
B8
LHD Vehicle:
W–R
Engine and
ECT ECU
Y
W–R
MPX1
MPX2
18
E9
11
E9
10 IL1
Y
W–R
7
W–R
ID1
M6
2
Sliding Roof
Control ECU
MPX1
V
V
DI–688
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
DTC
B1211 / 11
Driver door ECU communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between driver door ECU and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1211/11
No communication from driver door ECU more than 10 se-
S Driver door ECU
B1211/11
No communication from driver door ECU more than 10 se
conds.
Driver door ECU
S Wireharness
WIRING DIAGRAM
I19269
RHD Vehicle:
R14
5
MPX1
MPX2
R14
4
Rear Left
Door ECU
BA1
11
V
V
IA2
11
Y–R
Y–R
IC1
5
Front Passenger
Door ECU
MPX2
MPX1
11
F17
10
F17
Y
IC1
10
Y
E9
11
E9
18
Engine and
ECT ECU
MPX2
MPX1
W–R
W–R
W–R
ID1
7
M6
2
Sliding Roof
Control ECU
MPX1
W–R
Body ECU
MPX1
MPX2
11
B5
20
B8
B–O
I17
5
I17
12
Instrument Control
Panel
MPX+
MPX–
(*1)
(*1)
I16
13
I16
12
(*2)
(*2)
Y–B
C12
21
C12
17
Combination
Meter ECU
MPX+
MPX–
B
IE1
4
*1: Europe
*2: Except Europe
T5
8
T5
7
MPX1
MPX2
Theft Deterrent ECU
B
Y–R
5
IL1
Y–R
D12
11
Driver Door
ECU
MPX2
MPX1
D12
10
Y
10 IL1
V
3
IM1
Y–R
BB1
10
Y–R
R16
4
R16
5
Rear Right
Door ECU
MPX2
MPX1
W
11
BB1
Y
D11
9
D11
10
Double Lock Door
Control Relay
MPX1
MPX2
W
BD1
4
W
BA1
10
W
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–689
LEXUS RX300 (RM785E)
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