AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497/97

DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction

DESCRIPTION

The air conditioning harness connects the A/C amplifier and each servo. The A/C amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the A/C amplifier.

DTC No. DTC Detection Condition Trouble Area
B1497/97 Communication line error or open

  • Air conditioning harness

  • Air mix control servo motor (for driver side)

  • Air mix control servo motor (for front passenger side)

  • Air outlet control servo motor

  • Air inlet control servo motor

  • A/C amplifier

WIRING DIAGRAM

A019N33E01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) .

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic note
      Air Mix Servo Targ Pulse(D) Air mix servo motor pulse (D side) Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse(P) Air mix servo motor pulse (P side) Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (D) Air outlet servo motor pulse Min.: 0, Max. :255 -
      Air Inlet Damper Targ Pulse Air inlet damper target pulse Min.: 0, Max.: 255 -
      OK
      Arm of the damper servo motor selected in the Active Test moves smoothly

    6. According to the test, proceed to the next step.

      Result
      Result Proceed to
      One of the front air conditioner control servo motors is malfunctioning A
      All of the front air conditioner control servo motor are malfunctioning B

    B

    REPLACE AIR CONDITIONING HARNESS Click here

    A

  2. SYSTEM CHECK


    1. According to the test, proceed to the next step.

      Result
      Result Proceed to
      Only the air mix control servo motor (for front passenger side) is malfunctioning A
      Only the air inlet control servo motor is malfunctioning B
      Only the air outlet control servo motor is malfunctioning C
      Only the air mix control servo motor (for driver side) is malfunctioning D

    B

    REPLACE AIR INLET CONTROL SERVO MOTOR Click here

    C

    REPLACE AIR OUTLET CONTROL SERVO MOTOR Click here

    D

    REPLACE AIR MIX CONTROL SERVO MOTOR (FOR DRIVER SIDE) Click here

    A

  3. REPLACE AIR MIX CONTROL SERVO MOTOR (FOR FRONT PASSENGER SIDE)


    1. Replace the air mix control servo motor (for front passenger side) Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    B

    REPLACE AIR CONDITIONING HARNESS Click here

    A

    END

  4. REPLACE AIR INLET CONTROL SERVO MOTOR


    1. Replace the air inlet control servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    B

    REPLACE AIR CONDITIONING HARNESS Click here

    A

    END

  5. REPLACE AIR OUTLET CONTROL SERVO MOTOR


    1. Replace the air outlet control servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    B

    REPLACE AIR CONDITIONING HARNESS Click here

    A

    END

  6. REPLACE AIR MIX CONTROL SERVO MOTOR (FOR DRIVER SIDE)


    1. Replace the air mix control servo motor (for driver side) Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    B

    REPLACE AIR CONDITIONING HARNESS Click here

    A

    END

  7. REPLACE AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness Click here.

      Tech Tips

      Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE) Click here

    A

    END

  8. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A019O6DE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

      Disconnect the A/C amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-21 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here