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Inspection Procedure

  1. CHECK WIRE HARNESS (RAIN SENSOR - BATTERY AND BODY GROUND) 
    1. Disconnect the O3 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      O3-1 (SIG) - Body ground Always 10 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      O3-3 (ES) - Body ground Always Below 1 Ω
    Fig 1: Identifying Rain Sensor Connector Terminals
    G05007118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  2. CHECK RESISTANCE OF COMMUNICATION LINE 
    1. Disconnect the O3 and IR ECU connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      O3-2 (MPX) - IR-9 Always Below 1 Ω
    Fig 2: Identifying O3 And IR Connectors Terminals
    G05007119Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RAIN SENSOR 

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