DTC    B1281    Airbag ECU Communication Stop

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DESCRIPTION


HINT:
This DTC is detected when communication between the center airbag sensor assembly (Airbag ECU) and multiplex network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1281
Center airbag sensor assembly communication stops
  1. Center airbag sensor assembly
  2. Wire harness


WIRING DIAGRAM


B110984E02


INSPECTION PROCEDURE

HINT:
When "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1281, repair the "+B or GND short malfunction of communication bus" DTCs first.

1.CHECK FUSE (IGN)

  1. Remove the IGN fuse from the fusible link block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω



NG
REPLACE FUSE
OK


2.CHECK WIRE HARNESS (CENTER AIRBAG SENSOR ASSEMBLY - BATTERY AND BODY GROUND)


  1. Disconnect the A24 sensor connector.


    B111017E05

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A24-5 (IG2) - Body ground
    		Ignition switch ON
    		10 to 14 V

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A24-28 (E2) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE

  1. Disconnect the C9 meter connector.



  1. Disconnect the A11 amplifier connector.


    B111059E02

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A24-24 (MPX1) - C9-4 (MPX+)
    		Below 1 Ω
    A24-22 (MPX2) - A11-3 (MPX+)
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY