B1279
NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1279: Rain Sensor Communication Stop
B1279 - Rain Sensor Communication Stop
DESCRIPTION
This DTC is detected if communication between the rain sensor and gateway ECU stops for more than 10 seconds.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
If "+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 B1214.
PROCEDURE
1. INSPECT FUSE (ECU-IG LH)
(a) Remove the ECU-IG LH fuse from the main body ECU LH (cowl side junction block LH).
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE FUSE (ECU-IG LH)
OK -- Continue to next step.
2. 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:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD JUNCTION BLOCK - BATTERY AND BODY GROUND)
OK -- Continue to next step.
3. 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:
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)
(a) Disconnect the R7 and R5 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE RAIN SENSOR Removal
5. CHECK HARNESS AND CONNECTOR
(a) Disconnect the R5 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)
OK -- REPLACE OVERHEAD JUNCTION BLOCK