B1279

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1279: Rain Sensor Communication Stop
B1279 - Rain Sensor Communication Stop

DESCRIPTION

This DTC is detected when communication between the rain sensor and multiplex network gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1279, repair the "+B or GND short malfunction of communication bus" DTCs first.

PROCEDURE

1. INSPECT FUSE (ECU-IG LH)

(a) Remove the ECU-IG LH fuse from the cowl side J/B LH.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK WIRE HARNESS (OVERHEAD J/B - BATTERY AND BODY GROUND)

(a) Disconnect the R5 connector.





(b) Measure the voltage and resistance of the wire harness side connector.

Standard voltage:





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK WIRE HARNESS (RAIN SENSOR - BATTERY AND BODY GROUND)

(a) Disconnect the R7 connector.





(b) Measure the voltage and resistance of the wire harness side connector.

Standard voltage:





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK RESISTANCE OF COMMUNICATION LINE

(a) Disconnect the R7 and R5 ECU connectors.





(b) Measure the resistance between the specified terminals on the wire harness side connectors.

Standard resistance:





Result:





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR OR REPLACE RAIN SENSOR

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE RAIN SENSOR