Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 20tq5 cib1261
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05-191 1
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM 05BTH-02
DTC B1261 ECM COMMUNICATION STOP
CIRCUIT DESCRIPTION
DTC B1261 is output when communication between the ECM and the body ECU stops for more than 10 se-
conds.
DTC No. DTC Detection Condition Trouble Area
S ECM
B1261 ECM communication stops
S Wire harness
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2094
05-1912
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
WIRING DIAGRAM
ECM
J/C 6
21 4
R R
J3 J4 E5 +BM
J/C 25 3
11
B-W B-W
J5 J6 E4 BATT
A/C Amplifier Assy
(A/C ECU) J19
Engine Room
J/C
J/B Assy 3 18
R-L 70 90 R-L
3 2H 7 2H MPX- A9 E5 MPX1
EFI
ETCS Airbag Sensor Assy Multiplex Network
NO.1
(Airbag ECU) J/B Assy
24 6 32 29
R-L V
1 2D MPX1 A21 1E 1H E5 MPX2
W
BR 1
1 F8 E6 E1
FL Block
1 F6 4
E6 ME01
W
A
FL
J29
Main W-B
J/C
A
BR
Battery
EB EC
B67670
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2095
05-1913
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
INSPECTION PROCEDURE
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the E5 ECM, A9 A/C ECU and A21 airbag
Wire Harness Side
ECU connectors.
(b) Check the resistance between the wire harness side con-
E5 nectors.
ECM Standard:
Terminal No. Specified Condition
E5-18 (MPX1) - A9-3 (MPX-) Below 1
E5-29 (MPX2) - A21-24 (MPX1) Below 1
A9
A/C Amplifier Assy (A/C ECU)
A21
Airbag Sensor Assy (Airbag ECU)
NG REPAIR OR REPLACE HARNESS AND
B67681 CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2096
05-1914
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
2 CHECK ECM (POWER SOURCE)
Wire Harness Side (a) Disconnect the E5 and E4 ECM connectors.
(b) Check the voltage between the wire harness side con-
E5 nector and body ground.
ECM
Standard:
Terminal No. Specified Condition
E5-6 (+BM) - Body ground 10 to 14 V
E4-3 (BATT) - Body ground 10 to 14 V
E4
ECM
B67682 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK ECM (GROUND)
Wire Harness Side (a) Disconnect the E6 ECM connector.
E6 (b) Check the resistance between the wire harness side con-
ECM nector and body ground.
Standard:
Terminal No. Specified Condition
E6-1 (E1) - Body ground Below 1
E6-4 (ME01) - Body ground Below 1
B67683
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ECM
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2097
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