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Window Defogger System: Inspection

  1. INSPECT AIR CONDITIONING CONTROL ASSEMBLY 
    Fig 1: Identifying Air Conditioning Control Assembly
    G05266813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Auto air conditioning:

      Inspect operation of the defogger timer.

      1. Connect the positive (+) lead from the battery to terminal A3-3 and the negative (-) lead to terminal A4-6.
      2. Connect the positive (+) lead from the battery to terminal A4-1 through a 1.4 W test bulb.
      3. Push the defogger switch ON, check that the indicator light on the switch and the test bulb light up for 12 to 18 minutes, and then the indicator light and the test bulb go off.

        If the result is not as specified, replace the A/C control assembly.

      4. Disconnect the connector from the A/C control assembly.
      5. Check the voltage or continuity of each terminal of the wire harness side connector.
      Fig 2: Identifying Air Conditioning Control Assembly Connector Terminals
      G05266814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard 

      TERMINALS AND SPECIFIED CONDITION REFERENCE

      Terminal No. Condition Specified Condition
      A4-6 - Body ground Constant Below 1 Ω
      A4-1 - Body ground Ignition switch Lock or ACC No voltage
      A4-1 - Body ground Ignition switch ON Battery positive voltage
      A3-3 - Body ground Ignition switch Lock or ACC No voltage
      A3-3 - Body ground Ignition switch ON Battery positive voltage

      If the result is not as specified, there may be a malfunction on the wire harness side.

    2. Auto air conditioning, with EMV & NAVIGATION system:

      Inspect operation of the defogger timer.

      1. Connect the positive (+) lead from the battery to terminal 9 and the negative (-) lead to terminal 10.
      2. Connect the positive (+) lead from the battery to terminal 7 through a 1.4 W test bulb.
      3. Push the defogger switch ON, check that the indicator light on the switch and the test bulb light up for 12 to 18 minutes, and then the indicator light and the test bulb go off.

        If the result is not as specified, replace the A/C control assembly.

      4. Disconnect the connector from the A/C control assembly.
      5. Check the voltage or continuity of each terminal of the wire harness side connector.

        Standard 

    TERMINALS AND SPECIFIED CONDITION REFERENCE

    Terminal No. Condition Specified Condition
    10 - Body ground Constant Continuity
    7 - Body ground Ignition switch Lock or ACC No voltage
    7 - Body ground Ignition switch ON Battery positive voltage
    9 - Body ground Ignition switch Lock or ACC No voltage
    9 - Body ground Ignition switch ON Battery positive voltage

    If the result is not as specified, there may be a malfunction on the wire harness side.

    Fig 3: Identifying Air Conditioning Control Assembly
    G05266815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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