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AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Cooling Box Sensor Circuit

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DTC Code DTC Name
  Cooling Box Sensor Circuit
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DESCRIPTION

The No. 3 cooler thermistor is installed on the evaporator in the cooling box unit to detect the cooled air temperature that has passed through the evaporator and control the cooling box. It sends appropriate signals to the air conditioning amplifier assembly (for cool box). The resistance of the No. 3 cooler thermistor changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly (for cool box) applies voltage (12 V) to the No. 3 cooler thermistor and reads voltage changes as the resistance of the No. 3 cooler thermistor changes.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY - BATTERY)


    1. A01XALPE03

      Disconnect the No. 1 cooler wiring harness sub-assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4 - Body ground Always 11 to 14 V
      1 - Body ground Engine switch off Below 1 V
      1 - Body ground Engine switch on (IG) 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Cooler Wiring Harness Sub-assembly)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

    CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY - BODY GROUND)


    1. A01XALPE03

      Disconnect the No. 1 cooler wiring harness sub-assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      6 - Body ground Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)


    1. Replace the No. 1 cooler wiring harness sub-assembly with a new or known good one.

      OK
      Same problem does not occur.

    • OK

      END (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY WAS DEFECTIVE)

    • NGClick here
  4. Click here

    INSPECT NO. 3 COOLER THERMISTOR


    1. Remove the No. 3 cooler thermistor (Click here).

    2. Inspect the No. 3 cooler thermistor (Click here).


    • OK

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (for Cool Box) (Click here)

    • NG

      REPLACE NO. 3 COOLER THERMISTOR (Click here)