B1281

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1281: 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.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND)





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK COMMUNICATION LINE





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





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

Result:






C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR AND AIRBAG SENSOR ASSEMBLY
A -- REPLACE AIRBAG SENSOR ASSEMBLY