AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1411/11

DTC Code DTC Name
B1411/11 Room Temperature Sensor Circuit

DESCRIPTION

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

The air conditioning amplifier assembly applies a voltage (5 V) to the cooler (room temperature sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler (room temperature sensor) thermistor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1411/11

Room Temperature Sensor Circuit

Open or short in cooler (room temperature sensor) thermistor circuit

  • Cooler (room temperature sensor) thermistor

  • Harness or connector

  • Air conditioning amplifier assembly

Memorized (4 seconds or more)

-
Tip:

  • The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

  • If the cabin temperature is approximately -18.6°C (-1.48°F) or less, DTC B1411/11 may be output even though the system is normal.

WIRING DIAGRAM

E236721E33

CAUTION / NOTICE / HINT

Note:

When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization

Click here

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.

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Room Temperature Sensor

      Cooler thermistor (room temperature sensor)

      Min.: -6.50°C (20.30°F)

      Max.: 57.25°C (135.05°F)

      Actual cabin temperature displayed

      -

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Room Temperature Sensor

      OK

      The display is as specified in the normal condition column.

    Result

    Result

    Result

    Proceed to

    OK (When troubleshooting according to Problem Symptoms Table)

    A

    OK (When troubleshooting according to the DTC)

    B

    NG

    C
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick hereClick here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    C

  2. INSPECT COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR

    1. Remove the cooler (room temperature sensor) thermistor.

      Click here

    2. Inspect the cooler (room temperature sensor) thermistor.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR

    Click here

    OK

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

    1. Disconnect the G81 air conditioning amplifier assembly connector.

    2. Disconnect the G19 cooler (room temperature sensor) thermistor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G81-29 (TR) - G19-1

      Always

      Below 1 Ω

      G81-34 (SG-1) - G19-2

      Always

      Below 1 Ω

      G81-29 (TR) - Body ground

      Always

      10 kΩ or higher

      G81-34 (SG-1) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR