Dtc B1279 Rain Sensor Communication Stop

Communication System. Lexus Gs430, Gs300. Uzs190 Grs190
Multiplex Communication. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK RESISTANCE OF COMMUNICATION LINE

DTC B1279 Rain Sensor Communication Stop


DESCRIPTION

This DTC is detected when communication between the rain sensor and overhead J/B stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1279
Rain sensor communication stops
  1. Rain sensor
  2. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1279 Rain Sensor Communication Stop


INSPECTION PROCEDURE

1.CHECK RESISTANCE OF COMMUNICATION LINE
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1279 Rain Sensor Communication Stop

  1. Disconnect the Y4 sensor connector.

  1. Disconnect the Y7 junction block connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    Y4-1 (SIG) - Y7-10 (IG2)
    		Below 1 Ω
    Y4-2 (MPX) - Y7-9 (MPX1)
    		Below 1 Ω
    Y4-3 (ES) - Y7-17 (GND2)
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE RAIN SENSOR