AIR CONDITIONING SYSTEM, Diagnostic DTC:B1415/15

DTC Code DTC Name
B1415/15 Driver Side Duct Sensor

DESCRIPTION

The air duct sensor (for driver side) detects the register temperature and sends the appropriate signals to the air conditioning amplifier.

DTC No. Detection item Trouble Area
B1415/15

Air duct sensor circuit (for driver side)

(Open or short)

  • Air duct sensor (for driver side)

  • Harness and connector between duct sensor and air conditioning amplifier

  • Air conditioning amplifier

WIRING DIAGRAM

A001EYSE03

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (DUCT SENSOR (for Driver Side))


    1. Use the Data List to check if the duct sensor (for driver side) is functioning properly.

      Air Conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Duct Sensor (D Side)

      Duct sensor (for driver side) /

      Min.: -12.7°C (9.14°F)

      Max.: 76.55°C (169.79°F)

      		 Actual duct temperature is displayed (for driver side) -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      NG A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      OK (Checking from the DTC) C

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. CHECK AIR CONDITIONING AMPLIFIER (TFAL - SG-2, TFAR - SG-3 VOLTAGE)

    A001D2DE01
    *a Component with harness connected: (Air Conditioning Amplifier)
    *b for LHD:
    *c for RHD:

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

    2. Turn the engine switch on (IG).

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      L77-21 (TFAL) - L77-12 (SG-2) Engine switch on (IG) at 25°C (77°F) 1.8 to 2.2 V
      Engine switch on (IG) at 50°C (122°F) 0.8 to 1.2 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      L77-22 (TFAR) - L77-11 (SG-3) Engine switch on (IG) at 25°C (77°F) 1.8 to 2.2 V
      Engine switch on (IG) at 50°C (122°F) 0.8 to 1.2 V

      Tech Tips

      As the temperature increases, the voltage decreases.

      Result
      Result Proceed to
      NG A

      OK

      (Checking from the PROBLEM SYMPTOMS TABLE)

      		 B
      OK (Checking from the DTC) C

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  3. CHECK AIR DUCT SENSOR

    A001DITE05

    1. Remove the air duct sensor Click here.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 0°C (32°F) 14.5 to 19.0 kΩ
      25°C (77°F) 4.8 to 5.2 kΩ
      50°C (122°F) 1.6 to 2.0 kΩ

      Tech Tips

      As the temperature increases, the resistance decreases.


    NG

    REPLACE AIR DUCT SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR)

    A001EZAE03

    1. Disconnect the L14*1 or L87*2 air duct sensor connector.

    2. Disconnect the L77 air conditioning amplifier connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      L77-21 (TFAL) - L14-1 Always Below 1 Ω
      L77-12 (SG-2) - L14-2 Always Below 1 Ω
      L77-21 (TFAL) - Body ground Always 10 kΩ or higher
      L77-12 (SG-2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      L77-22 (TFAR) - L87-1 Always Below 1 Ω
      L77-11 (SG-3) - L87-2 Always Below 1 Ω
      L77-22 (TFAR) - Body ground Always 10 kΩ or higher
      L77-11 (SG-3) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR