B1279

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

DESCRIPTION

This DTC is stored if communication between the rain sensor and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
If DTC B1214 or B1215 (+B or GND short malfunction of communication bus) is stored at the same time as DTC B1279, perform troubleshooting for DTC B1214 or B1215 first.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - BATTERY AND BODY GROUND)

(a) Disconnect the R5 connector.





(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:





Standard Resistance:





Text in Illustration





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

2. CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BATTERY AND BODY GROUND)

(a) Reconnect the R5 connector.





(b) Disconnect the R7 connector.

(c) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:





Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the 2F and J55 connectors.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE RAIN SENSOR Removal

4. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)

(a) Disconnect the R5 connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)

OK -- REPLACE OVERHEAD JUNCTION BLOCK