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DTC B1279: Rain Sensor Communication Stop: Procedure

  1. INSPECT FUSE (ECU-IG LH) 
    1. Remove the ECU-IG LH fuse from the cowl side J/B LH.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (OVERHEAD J/B - BATTERY AND BODY GROUND) 
    1. Disconnect the R5 connector.
      GTY261227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage

      Tester Connection Condition Specified Condition
      IG (R5-21) - Body ground Engine switch on (IG) 10 to 14 V

      Standard resistance

      Tester Connection Specified Condition
      GND1 (R5-39) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (RAIN SENSOR - BATTERY AND BODY GROUND) 
    1. Disconnect the R7 connector.
      GTY118627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage

      Tester Connection Condition Specified Condition
      SIG (R7-1) - Body ground Engine switch on (IG) 10 to 14 V

      Standard resistance

      Tester Connection Specified Condition
      ES (R7-3) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK RESISTANCE OF COMMUNICATION LINE 
    1. Disconnect the R7 and R5 ECU connectors.
      GTY118629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the specified terminals on the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      MPX (R7-2) - MPX1 (R5-37) Below 1 Ω

      Result

      Result Proceed to
      Both are OK A
      One is OK B
      Both are NG C

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

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → REPLACE RAIN SENSOR 

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