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05-1927
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM 05BTL-02
DTC B1287 BACK DOOR ECU COMMUNICATION STOP
CIRCUIT DESCRIPTION
DTC B1287 is output when communication between the power back door ECU and the body ECU stops for
more than 10 seconds.
DTC No. DTC Detection Condition Trouble Area
S Multiplex network door ECU (Power back door ECU)
B1287 Back door ECU communication stops
S Wire harness
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2110
05-1928
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
WIRING DIAGRAM
Multiplex Network Door ECU Back
(Power Back Door ECU)
7 1 2
B-R B-R B-R
IB1 BF1 P14 B
Instrument Panel J/B Assy
24 7
1C 1L
W-L W-L
J19 J37
Engine Room
J/C J/C J/C
J/B Assy 7 23 5 10
54 15 W-L 13 3
8 2C J13 J14 BE1 P13 ECUB
W-L W-L W-L
ECU-B 4 20 22
13 73 R-L 11 1
J13 J14 P13 MPX1
R-L R-L
2
Short Pin
1 Instrument Panel J/B Assy
Multiplex Network
1 2D Body ECU
21
W R-L
B7 MPX2
2 F12 1 F8
PBD
FL Block
8
ALT P14 GND
1 F6
W
FL W-B
Main
Battery
BM
B89161
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2111
05-1929
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
INSPECTION PROCEDURE
1 CHECK RESISTANCE OF COMMUNICATION LINE
Wire Harness Side (a) Disconnect the P13 and B7 ECU connectors.
(b) Check the resistance between the wire harness side con-
P13
nectors.
Multiplex Network Door ECU Back
Standard:
(Power Back Door ECU)
Symbols (Terminal No.) Specified Condition
P13-22 (MPX1) - B7-21 (MPX2) Below 1
B7
Multiplex Network Body ECU
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
B67679
OK
2 CHECK MULTIPLEX NETWORK DOOR ECU BACK
(POWER BACK DOOR ECU) (POWER SOURCE)
Wire Harness Side (a) Disconnect the P13 and P14 ECU connectors.
(b) Check the voltage between the wire harness side con-
P13
Multiplex Network Door ECU Back
nector and body ground.
(Power Back Door ECU) Standard:
Terminal No. Specified Condition
P14-2 (B) - Body ground 10 to 14 V
P13-10 (ECUB) - Body ground 10 to 14 V
P14
Multiplex Network Door ECU Back
(Power Back Door ECU)
NG REPAIR OR REPLACE HARNESS AND
B67668 CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2112
05-1930
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
3 CHECK MULTIPLEX NETWORK DOOR ECU BACK
(POWER BACK DOOR ECU) (GROUND)
Wire Harness Side (a) Disconnect the P14 ECU connector.
P14 (b) Check the resistance between the wire harness side con-
Multiplex Network Door ECU Back nector and body ground.
(Power Back Door ECU) Standard:
Terminal No. Specified Condition
P14-8 (GND) - Body ground Below 1
NG REPAIR OR REPLACE HARNESS AND
B67680 CONNECTOR
OK
REPLACE MULTIPLEX NETWORK DOOR ECU BACK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2113
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