AIR CONDITIONING SYSTEM, Diagnostic DTC:B1411/11

DTC Code DTC Name
B1411/11 Room Temperature Sensor Circuit

DESCRIPTION

The room temperature sensor is installed in the instrument panel to detect the cabin temperature which is used to control the air conditioning system AUTO mode. The resistance of the room temperature sensor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the room temperature sensor and reads voltage changes as the resistance of the room temperature sensor changes. This sensor also sends appropriate signals to the A/C amplifier.

DTC No. DTC Detection condition Trouble Area
B1411/11 Open or short in room temperature sensor circuit

  • Room temperature sensor

  • Harness or connector between room temperature sensor and A/C amplifier

  • A/C amplifier

WIRING DIAGRAM

A01EK1TE07

INSPECTION PROCEDURE

PROCEDURE


  1. 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. Check the value(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Room Temperature Sensor

      Room temperature sensor /

      Min.: -6.5°C (20.3°F)

      Max.: 57.25°C (135.05°F)

      		 Actual cabin temperature displayed -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE A/C AMPLIFIER Click here

    A

  2. INSPECT ROOM TEMPERATURE SENSOR


    1. Remove the room temperature sensor.

    2. A01EJ3HE10
      Text in Illustration
      *1

      Component without harness connected

      (Room Temperature Sensor)
      *2 Sensing Portion

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D11-1 - D11-2 10°C (50°F) 3.00 to 3.73 kΩ
      D11-1 - D11-2 15°C (59°F) 2.45 to 2.88 kΩ
      D11-1 - D11-2 20°C (68°F) 1.95 to 2.30 kΩ
      D11-1 - D11-2 25°C (77°F) 1.60 to 1.80 kΩ
      D11-1 - D11-2 30°C (86°F) 1.28 to 1.47 kΩ
      D11-1 - D11-2 35°C (95°F) 1.00 to 1.22 kΩ
      D11-1 - D11-2 40°C (104°F) 0.80 to 1.00 kΩ
      D11-1 - D11-2 45°C (113°F) 0.65 to 0.85 kΩ
      D11-1 - D11-2 50°C (122°F) 0.50 to 0.70 kΩ
      D11-1 - D11-2 55°C (131°F) 0.44 to 0.60 kΩ
      D11-1 - D11-2 60°C (140°F) 0.36 to 0.50 kΩ

      Note


      • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.

      • When measuring, the sensor temperature must be the same as the ambient temperature.

      Tech Tips

      As the temperature increases, the resistance decreases (see the graph).


    NG

    REPLACE ROOM TEMPERATURE SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER)


    1. Disconnect the D47 A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D47-29 (TR) - D11-1 Always Below 1 Ω
      D47-34 (SG-1) - D11-2 Always Below 1 Ω
      D47-29 (TR) - Body ground Always 10 kΩ or higher
      D47-34 (SG-1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here