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05-1923
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM 05BTK-02
DTC B1281 AIRBAG ECU COMMUNICATION STOP
CIRCUIT DESCRIPTION
DTC B1281 is output when communication between the airbag ECU and the body ECU stops for more than
10 seconds.
DTC No. DTC Detection Condition Trouble Area
S Airbag sensor assy (Airbag ECU)
B1281 Airbag ECU communication stops
S Wire harness
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2106
05-1924
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
WIRING DIAGRAM
Instrument Panel J/B Assy Airbag Sensor Assy
Multiplex Network (Airbag ECU)
Body ECU
7 22
14 R-L
MPX1 1E A21 MPX2
ECM Instrument Panel J/B Assy
29 32 6 24
V R-L
MPX2 E5 1H 1E A21 MPX1
I15
Ignition Switch
5 27 IGN 9 5
W-R 6 B B-O
1H 1E A21 IG2
AM2 IG2
16 J4
ST2
J/C 16 1 27
W-B W-B
1L 1E A21 E1
33 J3
W-R
3 3 28
W-B W-B
1 2H 1H 1E A21 E2
2 Engine
Room J/B
AM2
Assy
1
1 2D
W
1 F8
FL Block
1 F6
B
FL
Main
Battery
IE IF
B67673
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2107
05-1925
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
INSPECTION PROCEDURE
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the A21 ECU, 1E J/B and E5 ECM connec-
Wire Harness Side
tors.
A21
(b) Check the resistance between the wire harness side con-
Airbag Sensor Assy (Airbag ECU) nectors.
Standard:
Terminal No. Specified Condition
1E-7 (MPX1) - A21-22 (MPX2) Below 1
E5-29 (MPX2) - A21-24 (MPX1) Below 1
1E
Instrument Panel J/B Assy
(Body ECU)
1 2 3 4 5 6
7 8 9 10
E5
ECM
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
B68238
OK
2 CHECK AIR BAG SENSOR ASSY CENTER (AIRBAG ECU)
(POWER SOURCE)
Wire Harness Side (a) Turn the Ignition switch ON.
(b) Disconnect the A21 ECU connector.
A21
Airbag Sensor Assy (Airbag ECU) (c) Check the voltage between the wire harness side con-
nector and body ground.
Standard:
Terminal No. Specified Condition
A21-5 (IG2) - Body ground 10 to 14 V
NG REPAIR OR REPLACE HARNESS AND
B68239 CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2108
05-1926
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
3 CHECK AIR BAG SENSOR ASSY CENTER (AIRBAG ECU)
(GROUND)
Wire Harness Side (a) Disconnect the A21 ECU connector.
A21 (b) Check the resistance between the wire harness side con-
Airbag Sensor Assy (Airbag ECU) nector and body ground.
Standard:
Terminal No. Specified Condition
A21-27 (E1) - Body ground Below 1
A21-28 (E2) - Body ground Below 1
B68239 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE AIR BAG SENSOR ASSY CENTER
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2109
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