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Air Conditioning Control Assembly: Inspection

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT AIR CONDITIONING CONTROL ASSEMBLY 
    1. Check the blower switch resistance.
      1. Using an ohmmeter, measure the resistance and check the results in accordance with the values in TESTER CONNECTION SPECIFIED CONDITION TABLE .

        Standard 

        TESTER CONNECTION SPECIFIED CONDITION TABLE

        Tester connection Blower Switch Position Specified Condition
        2 - 3 - 4 - 6 - 7 OFF 10 K or higher
        2 - 6 LO Below 1
        2 - 6 - 7 LO - M1 Below 1
        2 - 6 - 7 M1 Below 1
        2 - 4 - 6 - 7 M1 - M2 Below 1
        2 - 4 - 6 M2 Below 1
        2 - 3 - 4 - 6 M2 - HI Below 1
        2 - 3 - 6 HI Below 1

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 1: Measuring Resistance Between Terminals Using Ohmmeter
        G04411543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the temperature selector switch voltage.
      1. Apply battery voltage (13.5 V) across terminals 10 (IG) and 9 (GND).
      2. Connect the positive (+) tester probe of a voltmeter to terminal 6 (AMSW) and the negative (-) tester probe to terminal 9 (GND), then check the voltage.

        Standard 

        ANGLE SPECIFIED CONDITION TABLE

        Angle (Position) Specified Condition
        0° (MAX COOL) 13.0 to 13.5 V
        60° (COOL) 9.7 to 10.6 V
        120° 6.3 to 7.2 V
        180° (HOT) 2.9 to 3.8 V
        240° (MAX HOT) 0 to 0.5 V

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 2: Checking Temperature Selector Switch Voltage
        G04411544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the mode selector switch voltage.
      1. Apply battery voltage (13.5 V) across terminals 10 (IG) and 9 (GND).
      2. Connect the positive (+) tester probe of a voltmeter to terminal 5 (MSET) and the negative (-) tester probe to terminal 9 (GND), then check the voltage.

        Standard 

        ANGLE SPECIFIED CONDITION TABLE

        Angle (Position) Specified Condition
        0° (FACE) 13.3 to 13.5 V
        60° (B/L) 10.1 to 11.0 V
        120° (FOOT) 6.3 to 7.2 V
        180° (FOOT/DEF) 2.7 to 3.4 V
        240° (DEF) 0 to 0.2 V

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 3: Checking Mode Selector Switch Voltage
        G04411545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the illumination operation.
      1. Connect the positive (+) lead from the battery to terminal 3 (ILL+) and negative (-) lead to terminal 8 (ILL-), then check that the illuminations light up.

        Standard: Illuminations light up 

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

        Fig 4: Connecting (+) Lead From Battery To Terminal 3 (ILL+) & (-) Lead To Terminal 8 (ILL-)
        G04411546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Inspect the bulb.
      1. Inspect continuity of the bulb by connecting the tester as shown in Fig 5.

        Standard: 7 to 11 at 20°C (68°F) 

        If continuity exists, replace the heater control.

        If no continuity exists, replace the bulb.

        Fig 5: Inspecting Continuity Of Bulb By Connecting Tester
        G04411547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Inspect A/C indicator operation.
      1. Connect the positive (+) lead from the battery to terminal 10 (IG) and negative (-) lead to terminal 2 (ACID) and 9 (GND).
      2. Push the A/C button in and then check that the indicator lights up.

        Standard: Indicator lights up 

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 6: Connecting (+) Lead From Battery To Terminal 10 & (-) Lead To Terminal 2 & 9
        G04411548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Under the above condition, connect the positive (+) lead from the battery to terminal 3 (ILL+) and then check that the indicator dims.

        Standard: Indicator dims 

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 7: Connecting Positive (+) Lead From Battery To Terminal 3 (ILL+)
        G04411549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Inspect the REC indicator operation.
      1. Connect the positive (+) lead from the battery to terminal 10 (IG) and negative (-) lead to terminal 4 (REC) and 9 (GND).
      2. Push the REC button in and then check that the indicator lights up.

        Standard: Indicator lights up 

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 8: Connecting (+) Lead From Battery To Terminal 10 & (-) Lead To Terminal 4 & 9
        G04411550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Under the above condition, connect the positive (+) lead from the battery to terminal 3 (ILL+) and then check that the indicator dims.

        Standard: Indicator dims 

        If the result is not as specified, replace the air conditioning control assembly.

        Fig 9: Connecting Positive (+) Lead From Battery To Terminal 3 (ILL+)
        G04411551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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