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

DTC B1272 Power Seat ECU Communication Stop DESCRIPTION This DTC is detected when communication between the seat position control ECU and the multiplex network gateway ECU stops for more than 10 ...

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:

High pitched horn
COMPONENTS REMOVAL 1. REMOVE FRONT BUMPER COVER 2. REMOVE HIGH PITCHED HORN Disconnect the connector. Remove the bolt and horn. INSPECTION 1. INSPECT HIGH PITCHED HORN Apply battery voltage and check operation of the horn, as shown in the table. Standard ...

Removal
1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait for 90 seconds after disconnecting the cable to prevent the airbag working. 3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD 4. REMOVE STEE ...

Precaution
1. Handling precautions on steering system (a) Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in a driving hazard. 2. Handling precautions on srs airbag system (A) the vehicle is equipped with srs (supplemental res ...