AIR CONDITIONING SYSTEM, Diagnostic DTC:B1462/62

DTC Code DTC Name
B1462/62 Room Humidity Sensor Circuit

DESCRIPTION

The room humidity sensor detects cabin humidity. The voltage of the room humidity sensor changes in accordance with cabin humidity. The A/C amplifier reads changes in the room humidity sensor.

The room humidity sensor is integrated with the room temperature sensor.

DTC No. DTC Detecting Condition Trouble Area
B1462/62 Open or short in room humidity sensor circuit

  • Room humidity sensor

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

  • A/C amplifier

WIRING DIAGRAM

A01NETDE08

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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
      Humidity Sensor Room humidity sensor / Min.: 0%, Max.: 100% Actual cabin humidity 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. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01NG32E11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Room Humidity Sensor)

      Disconnect the room humidity sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F99-4 (S5) - F99-2 (-) Power switch on (IG) 4.5 to 5.5 V

    NG

    CHECK HARNESS AND CONNECTOR (ROOM HUMIDITY SENSOR - A/C AMPLIFIER) Click here

    OK

  3. INSPECT ROOM HUMIDITY SENSOR


    1. A01NCWIE05
      Text in Illustration
      *1

      Component with harness connected

      (Room Humidity Sensor)

      Reconnect the room humidity sensor connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 10%

      		 0.7 to 1.08 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 20%

      		 0.72 to 1.57 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 30%

      		 1.13 to 1.95 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 40%

      		 1.61 to 2.24 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 50%

      		 1.99 to 2.46 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 60%

      		 2.26 to 2.66 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 70%

      		 2.48 to 2.85 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 80%

      		 2.68 to 3.04 V
      F99-3 (RH) - F99-2 (-)

      at 25°C (77°F)

      Humidity 90%

      		 2.87 to 3.05 V

      Note


      • Do not touch the room humidity sensor because it may be affected by body temperature and may not work properly.

      • Hold the sensor only by its connector.

      • The output voltage at the ambient temperature 25°C (77°F) is shown above.

      Tech Tips

      As the humidity increases, the voltage increases (see the graph).


    NG

    REPLACE ROOM HUMIDITY SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (ROOM HUMIDITY SENSOR - A/C AMPLIFIER)


    1. A01NDH4E54

      Disconnect the A/C amplifier connector.

    2. A01NG32E12

      Disconnect the room humidity sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-31 (S5-4) - F99-4 (S5) Always Below 1 Ω
      F50-28 (RH) - F99-3 (RH) Always Below 1 Ω
      F50-34 (SG-1) - F99-2 (-) Always Below 1 Ω
      F50-31 (S5-4) - Body ground Always 10 kΩ or higher
      F50-28 (RH) - Body ground Always 10 kΩ or higher
      F50-34 (SG-1) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to Room Humidity Sensor)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here