AIR CONDITIONING SYSTEM, Diagnostic DTC:B1411/11

DTC Code DTC Name
B1411/11 Room Temperature Sensor Circuit

DESCRIPTION

The cooler 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 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 thermistor and reads voltage changes due to changes in the resistance of the cooler thermistor.

DTC Code DTC Detection Condition Trouble Area
B1411/11 Open or short in cooler thermistor circuit

  • Cooler thermistor

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01FR7FE14

INSPECTION PROCEDURE

Note


  • When the auxiliary battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization Click here.

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

PROCEDURE


  1. READ VALUE USING GTS (ROOM TEMPERATURE 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 Click here.

    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

      Cooler thermistor /

      min.: -6.50°C (20.30°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 AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. INSPECT COOLER THERMISTOR


    1. Remove the cooler thermistor Click here.

    2. Inspect the cooler thermistor Click here.


    NG

    REPLACE COOLER THERMISTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the N157 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N157-16 (TR) - N44-1 Always Below 1 Ω
      N157-1 (SG-1) - N44-2 Always Below 1 Ω
      N157-16 (TR) - Body ground Always 10 kΩ or higher
      N157-1 (SG-1) - Body ground Always 10 kΩ or higher
      N157-16 (TR) - N157-1 (SG-1) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here