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Air Conditioning Control Assembly: Inspection

WARNING: This page is about a different car, the 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect Indictor Operation 

    Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to each terminal, then check that the indicator lights up as shown in the chart.

    Fig 1: Reviewing Tester Connection information
    G01179085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If operation is not as specified, replace the P/C board.

    Fig 2: Identifying P/C Boards & Components
    G01179086Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Inspect Indicator Dimming Operation 
    1. Perform each indicator light up (See step 1).
    2. Connect the positive (+) lead from the battery to terminal 1 and check that the each indicator dims.

    If the operation is not as specified, replace the P/C board.

    If the operation is as specified, replace the A/C amplifier.

  3. Inspect Bulb Operation 

    Apply the tester as shown in the illustration to the test for continuity.

    Fig 3: Inspecting Bulb Operation
    G01179087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If continuity exists, replace the P/C board.

    If on continuity exists, replace the bulb.

  4. Inspect Switch Operation 

    Check the continuity exists between terminals while the switch is pressed.

    Fig 4: Determining Specified Condition Based On Switch Position
    G01179088Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If operations is not as specified, replace the P/C board.

    If operations is as specified, check the wire harness or replace the A/C amplifier.

    Fig 5: Inspecting Switch Operation
    G01179089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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