Toyota Sienna Service Manual: Airbag ECU Communication Stop

Toyota Sienna Service Manual / Multiplex communication / System description / Diagnostic trouble code chart / Airbag ECU Communication Stop

DTC B1281 Airbag ECU Communication Stop

DESCRIPTION

DTC B1281 is output when communication between the airbag ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DTC No.	DTC Detection Condition	Trouble Area
B1281	Airbag ECU communication stops	Airbag sensor assembly Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY)

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY)

Disconnect the A21 ECU connector.
Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND)

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND)

Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

Disconnect the 1E and A9 ECU connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

HINT:
*1: for Automatic A/C
*2: for Manual A/C

Result

Result

REPLACE AIRBAG SENSOR ASSEMBLY

Power Seat ECU Communication Stop

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Back Door ECU Communication Stop

DTC B1287 Back Door ECU Communication Stop DESCRIPTION DTC B1287 is output when communication between the power back door ECU and the multiplex network gateway ECU stops for more than 10 seconds. ...

Other materials:

On-vehicle inspection
1. INSPECT SIDE AIRBAG SENSOR (VEHICLE NOT INVOLVED IN COLLISION) Perform a diagnostic system check. 2. INSPECT SIDE AIRBAG SENSOR (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) Perform a diagnostic system check. When the center pillar of the vehicle or ...

ECM
COMPONENTS REMOVAL 1. REMOVE GLOVE COMPARTMENT DOOR ASSEMBLY (a) Push the right side wall and then push the left wall to release the stoppers. (b) Pull the glove compartment door sub-assembly rearward to remove it. 2. REMOVE NO. 2 INSTRUMENT PANEL BOX (a) Disengage the 2 claws ...

Manual Up / Down and Auto Down Function does not Operate on Driver Side
DESCRIPTION If the manual UP/DOWN function does not operate, no power may be supplied to the power window master switch or the power window motor. The power window master switch itself or the wire harness may be malfunctioning. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT FUSE (P/W) ...