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DTC B1279: Rain Sensor Communication Stop: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK WIRE HARNESS (RAIN SENSOR - BATTERY AND BODY GROUND) 
    1. Disconnect the N3 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage

      Tester Connection Condition Specified Condition
      N3-1 (SIG) - Body ground Ignition Switch On (IG) 10 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Resistance

      Tester Connection Condition Specified Condition
      N3-3 (ES) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK RESISTANCE OF COMMUNICATION LINE 
    1. Disconnect the N3 and IR ECU connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance

      Tester Connection Condition Specified Condition
      N3-2 (MPX) - IR-9 Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE RAIN SENSOR 

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