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Home >> Toyota >> 2009 >> Avalon XLS >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Communication >> Multiplex Communication System >> DTC B1279 Rain Sensor Communication Stop >> Inspection Procedure

Inspection Procedure

  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 

      VOLTAGE SPECIFICATION

      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.
      Fig 1: Identifying Rain Sensor Connector Terminals
      G05408831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Resistance 

      RESISTANCE SPECIFICATION

      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 

      RESISTANCE SPECIFICATION

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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Rain Sensor And Instrument Panel J/B Connector Terminals
    G05408832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE RAIN SENSOR 

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