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

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Other materials:

Installation
1. INSTALL HEATED OXYGEN SENSOR (for Bank 2 Sensor 2) (See page EC-39) 2. INSTALL FRONT EXHAUST PIPE ASSEMBLY (a) Install a new gasket to the front exhaust pipe assembly. (b) Install the front exhaust pipe assembly with the 2 nuts. Torque: 62 N*m (632 kgf*cm, 46 ft.*lbf) 3. V V(A) ins ...

Installation
1. REMOVE FRONT SEAT INNER BELT ASSEMBLY HINT: Refer to the instructions for reassembly of the front seat assembly (for flat type). Refer to the instructions for reassembly of the front seat assembly (for manual seat). Refer to the instructions for reassembly of the ...

Touch screen gestures
Operations are performed by touching the screen directly with your finger. Operation method Outline Main use Touch Quickly touch and release once. Changing and selecting various settings. Drag* Touch the screen with your ...