AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) A/C Switch Indicator does not Turn On

DESCRIPTION

If none of the switch indicators on the air conditioning control assembly illuminate, the following factors may be the cause.

Symptom Factor
A/C switch indicator does not illuminate

  • Air conditioning amplifier assembly malfunction

  • Air conditioning control assembly malfunction

  • A/C switch malfunction

  • A/C switch indicator malfunction (including when indicator turned off without switch operation)

  • Servo motor initialization (incomplete)

  • Mechanical locking of damper and damper link

  • Refrigerant pressure is extremely low

  • Low detected ambient temperature (including thermistor assembly malfunction)

PROCEDURE


  1. CHECK MALFUNCTION STATUS


    1. Check the malfunction status of switch indicators on the air conditioning control assembly.

      Result
      Result Proceed to
      Indicators are not always illuminated A
      Indicators are not illuminated only immediately after starting the engine B

    B

    GO TO INITIALIZATION Click here

    A

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Ambient Temp Sensor Thermistor assembly

      Min.: -23.30°C (-9.94°F)

      Max.: 65.95°C (150.71°F)

      		 Actual ambient temperature displayed

      Thermistor assembly circuit malfunction


      • When open circuit: -23.30°C (-9.94°F)

      • When short circuit: 65.95°C (150.71°F)

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Ambient Temp Sensor
      OK
      The value displayed is 0°C (32°F) or higher.
      Result
      Proceed to
      OK
      NG

    OK

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET Click here

    NG

    GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System) Click here