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Rear Cooler Control Panel: Inspection

  1. INSPECT ILLUMINATION LIGHT 
    1. Connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 21, and then check that the indicators come on.

      If the operation is not as specified, replace the rear heater control assembly.

      Fig 1: Checking Illumination Light
      G05284371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT INDICATOR 
    1. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to each of the other terminals in order from 3 to 9, and then check that the indicator illuminates as shown in the chart.
      Fig 2: Checking Indicator
      G05284372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK 

      TESTER CONNECTION SPECIFIED CONDITION

      Switch Tester Connection Specified Condition
      Auto 3 Indicator light illuminates
      LO 4 Indicator light illuminates
      ME 5 Indicator light illuminates
      HI 6 Indicator light illuminates
      FACE 7 Indicator light illuminates
      Bi-Level 8 Indicator light illuminates
      FOOT 9 Indicator light illuminates

      If the operation is not as specified, replace the rear heater control assembly.

    2. Connect the positive (+) lead from the battery to terminal 2, and then check the indicators dim. If the operation is not as specified, replace the rear heater control assembly.
      Fig 3: Connecting Positive (+) Lead From Battery To Terminal
      G05284373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT HEATER CONTROL SWITCH 
    1. Check the continuity between terminals while the switch is pressed, as shown in the chart.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Switch Tester Connection Specified Condition
      Auto 13 - 22 Below 1 Ω
      OFF 14 - 22 Below 1 Ω
      LO 15 - 22 Below 1 Ω
      ME 16 - 22 Below 1 Ω
      HI 17 - 22 Below 1 Ω
      FACE 18 - 22 Below 1 Ω
      Bi-Level 19 - 22 Below 1 Ω
      FOOT 20 - 22 Below 1 Ω

      If the result is not as specified, replace the rear heater control assembly.

      Fig 4: Identifying Heater Control Switch Connectors
      G05284374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT VARIABLE RESISTOR 
    1. Measure the resistance between terminals 11 and 12.

      Standard resistance: 

      3.0 kΩ 

    2. Gradually move the temperature control lever from "COOL" side to "WARM" side, and then check that the resistance between terminals 11 and 12 increases to 3.0 kΩ

      If the operation is not as specified, replace the rear heater control assembly.

      Fig 5: Measuring Resistance Between Terminals 11 And 12
      G05284375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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