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AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A4

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DTC Code DTC Name
B14A4 Solar Sensor Short Circuit(Rear Driver Side)
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DESCRIPTION

The cooler thermistor (No. 2 room temperature sensor) detects the cabin temperature and controls the air conditioning system "AUTO" mode. The resistance of the No. 2 room temperature sensor changes according to changes in cabin temperature. The resistance value increases when the cabin temperature is low, and, conversely, decreases when the cabin temperature is high. The rear multiplex network door ECU LH sends the No. 2 room temperature sensor signal to the air conditioner amplifier assembly via CAN communication. The rear multiplex network ECU LH outputs voltage (5 V) to the No. 2 room temperature sensor, and reads changes in the voltage associated with changes in the resistance of the ambient temperature sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14A4 Solar Sensor Short Circuit(Rear Driver Side)

  • Diagnosis condition: With sunlight

  • Malfunction status: Open or short in rear solar sensor circuit

  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)

  • Cooler thermistor (solar sensor)

  • Harness or connector

  • Rear multiplex network door ECU LH

  • Air conditioning amplifier assembly

 Memorized
Table 1. *a RRTS *b Cooler Thermistor (Solar Sensor) *c Air Conditioning Amplifier Assembly
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WIRING DIAGRAM

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PROCEDURE


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    READ VALUE USING GTS (REAR SOLAR SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.


      1. Body Electrical > Air Conditioner > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Rear Solar Sensor Cooler thermistor (solar sensor) 0 to 255 Cooler thermistor (solar sensor) value increases as brightness increases

        Cooler thermistor (solar sensor) system malfunction


        • When open circuit: 0

        • When short circuit: 255



      1. Body Electrical > Air Conditioner > Data List
        Tester Display
        Rear Solar Sensor




      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

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    INSPECT COOLER THERMISTOR (SOLAR SENSOR)


    1. Remove the cooler thermistor (solar sensor).

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    2. Inspect the cooler thermistor (solar sensor).

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      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER THERMISTOR (ROOM TEMPERATURE SENSOR))


    1. Disconnect the G64 air conditioning amplifier assembly connector.

    2. Disconnect the L135 cooler thermistor (solar sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G64-22 (RRTS) - L135-2 Always Below 1 Ω
      G64-1 (S 5-4) - L135-1 Always Below 1 Ω
      G64-22 (RRTS) or L135-2 - Other terminals and body ground Always 10 kΩ or higher
      G64-1 (S 5-4) or L135-1 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR