AIR CONDITIONING SYSTEM (for Manual Air Conditioning System), Diagnostic DTC:B1497

DTC Code DTC Name
B1497 Communication Malfunction (Bus Ic)

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B1497 An open circuit or malfunction in the communication line.

  • Recirculation damper servo sub-assembly

  • Damper servo sub-assembly RH

  • Damper servo sub-assembly LH

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

  • Harness or connector

WIRING DIAGRAM

A00XJX8E01

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. Select the Active Test, use the intelligent tester to generate a control command, and then check that the servo motor operates Click here.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) target pulse Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse (P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) target pulse Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) target pulse Min.: 0, Max.: 255 -
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly target pulse Min.: 0, Max.: 255 -
      OK
      Arm of the servo motor selected in the Active Test moves smoothly

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

      Result
      Result Proceed to
      One of the front servo motors is malfunctioning A
      All of the front servo motors are malfunctioning B

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  2. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the recirculation damper servo sub-assembly is malfunctioning A
      Only the damper servo sub-assembly RH is malfunctioning B
      Only the damper servo sub-assembly LH is malfunctioning C

    B

    REPLACE DAMPER SERVO SUB-ASSEMBLY RH Click here

    C

    REPLACE DAMPER SERVO SUB-ASSEMBLY LH Click here

    A

  3. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY


    1. Replace the recirculation damper servo sub-assembly 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 ASSEMBLY Click here

    A

    END

  4. REPLACE DAMPER SERVO SUB-ASSEMBLY RH


    1. Replace the damper servo sub-assembly RH 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 ASSEMBLY Click here

    A

    END

  5. REPLACE DAMPER SERVO SUB-ASSEMBLY LH


    1. Replace the damper servo sub-assembly LH 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 ASSEMBLY Click here

    A

    END

  6. REPLACE AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly 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

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) Click here

    A

    END

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)


    1. A00XHQUE20
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the G25 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G25-21 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here