B1281

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1281: Airbag ECU Communication Stop

DTC B1281 - Airbag ECU Communication Stop

DESCRIPTION
HINT: "Airbag ECU" refers to the center airbag sensor.
This DTC is detected when communication between the center airbag sensor and network gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION
(a) Turn the power switch ON (IG) and check that the SRS warning light illuminates for approximately 6 seconds.
(b) Start the engine and check that the SRS warning light on the combination meter turns off.
OK -- REPLACE CENTER AIRBAG SENSOR
NG -- Continue to next step.
2. CHECK WIRE HARNESS (CENTER AIRBAG SENSOR - BATTERY AND BODY GROUND)





(a) Disconnect the K44 sensor connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard resistance:
Standard voltage










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





(a) Disconnect the K44 sensor connector.
(b) Disconnect the K31 meter connector.
(c) Disconnect the K52 amplifier connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





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