AIR CONDITIONING SYSTEM, Diagnostic DTC:B14AA

DTC Code DTC Name
B14AA Glass Humidity Sensor Circuit

DESCRIPTION

The air conditioning thermistor assembly (glass humidity sensor) detects cabin humidity. The voltage of the air conditioning thermistor assembly (glass humidity sensor) changes in accordance with cabin humidity. The air conditioning amplifier assembly reads the changes in output voltage of the air conditioning thermistor assembly (glass humidity sensor).

The glass humidity sensor is integrated with the air conditioning thermistor assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14AA Glass Humidity Sensor Circuit

Any of the following conditions is met:


  • Open in glass humidity sensor circuit

  • Short in glass humidity sensor circuit

  • Air conditioning thermistor assembly (glass humidity sensor)

  • Harness or connector

  • Air conditioning amplifier assembly

Memorized

(4 seconds or more)

Tech Tips

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

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Power switch on (IG) ○ ○
Malfunction Status Open in glass humidity sensor circuit ○ -
Short in glass humidity sensor circuit - ○
Detection Time 4 seconds or more 4 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A01MJU0E01

CAUTION / NOTICE / HINT

Tech Tips

The air conditioning thermistor assembly must be replaced if the glass humidity sensor is malfunctioning.

PROCEDURE


  1. READ VALUE USING GTS


    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. 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
      Glass Humidity Glass humidity

      Min.: 0.00%

      Max.: 100.00%

      		 Actual glass humidity is displayed -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Glass Humidity
      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. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01MIURC02
      *a

      Front view of wire harness connector

      (to Air Conditioning Thermistor Assembly (Glass Humidity Sensor))

      Disconnect the air conditioning thermistor assembly (glass humidity sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      W11-5 (S5V) - Body ground Power switch off Below 1 V
      W11-5 (S5V) - Body ground Power switch on (IG) 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS HUMIDITY SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) Click here

    OK

  3. INSPECT AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS HUMIDITY SENSOR)


    1. Remove the air conditioning thermistor assembly (glass humidity sensor).

      Click here

    2. Inspect the air conditioning thermistor assembly (glass humidity sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS TEMPERATURE SENSOR) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS HUMIDITY SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the W11 air conditioning thermistor assembly (glass humidity sensor) connector.

    2. Disconnect the G43 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W11-3 (RH) - G43-28 (RH) Always Below 1 Ω
      W11-3 (RH) or G43-28 (RH) - 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

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS HUMIDITY SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the W11 air conditioning thermistor assembly (glass humidity sensor) connector.

    2. Disconnect the G43 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W11-1 (SEG3) - G43-35 (SG-4) Always Below 1 Ω
      W11-5 (S5V) - G43-31 (S5-4) Always Below 1 Ω
      W11-1 (SEG3) or G43-35 (SG-4) - Body ground Always 10 kΩ or higher
      W11-5 (S5V) or G43-31 (S5-4) - 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