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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 41 (MANUAL A/C-HEATER SYSTEMS)HEATER CONTROL ASSEMBLYINSPECTION
2004 Toyota Celica GT, Standard

Heater Control Assembly: Inspection

2004 Toyota Celica GT, StandardSECTION Inspection
WARNING: This page is about a different car, the 2002 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect illumination operation  :

    Connect the positive (+) lead from the battery to terminal 7 and negative (-) lead to terminal 4 then check that the illuminations lights up.

    If operation is not as specified, check the faulty bulb.

    Fig 1: Locating Heater Control Assembly Terminals & Testing Operation
    G01053060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Inspect bulb  :

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

    If continuity exists, replace the heater control.

    If no continuity exists, replace the bulb.

    Fig 2: Testing Light Bulb
    G01053061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Inspect A/C indicator operation  :
    1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3 and 10.
    2. Push the A/C button in and then check that the indicator lights up.

    If operation is not as specified, replace the switch.

    Fig 3: Locating A/C Indicator Terminals & Testing A/C Indicator Operation
    G01053062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Inspect dimming operation  :
    1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3 and 10 while press the switch.
    2. Connect the positive (+) lead from battery to terminal 7 and then check that the indicator dims.

    If operation is not as specified, replace the switch.

    Fig 4: Locating A/C Dimming Terminals & Testing A/C Dimming Operation
    G01053063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Inspect A/C switch continuity  :
    Fig 5: Locating A/C Switch Terminals
    G01053066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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