AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497/97

DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction

DESCRIPTION

The air conditioning harness assembly 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 assembly. 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 assembly

  • Rear air conditioning harness assembly

  • Servo motors

  • A/C amplifier

WIRING DIAGRAM

A01CCE6E01

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 / 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 (D side) Min.: 0, Max.: 255 -
      Air Inlet Damper Targ Pulse Air inlet damper target pulse Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse (R) Rear air mix servo motor pulse Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (R) Rear air outlet servo motor pulse (D side) 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 damper servo motors is malfunctioning A
      All of the front air conditioner damper servo motors are malfunctioning B
      One of the rear air conditioner damper servo motors is malfunctioning C
      All of the rear air conditioner damper servo motors are malfunctioning D

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    C

    SYSTEM CHECK Click here

    D

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR 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 damper servo motor (for driver side) is malfunctioning A
      Only the air mix damper servo motor (for passenger side) is malfunctioning B
      Only the air inlet control servo motor is malfunctioning C
      Only the air outlet control servo motor is malfunctioning D

    B

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

    C

    REPLACE AIR INLET CONTROL SERVO MOTOR Click here

    D

    REPLACE AIR OUTLET CONTROL SERVO MOTOR Click here

    A

  3. 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 is not output A
      DTC B1497 is output B

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

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


    1. Replace the air mix control servo motor (for 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 is not output A
      DTC B1497 is output B

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  5. 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 is not output A
      DTC B1497 is output B

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  6. 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 is not output A
      DTC B1497 is output B

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  7. REPLACE AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly Click here.

      Tech Tips

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly 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 is not output A
      DTC B1497 is output B

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE) Click here

    A

    END

  8. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the rear air mix control servo motor is malfunctioning A
      Only the rear air outlet control servo motor is malfunctioning B

    B

    REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR Click here

    A

  9. REPLACE REAR AIR MIX CONTROL SERVO MOTOR


    1. Replace the rear air mix 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 is not output A
      DTC B1497 is output B

    B

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

    A

    END

  10. REPLACE REAR 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 is not output A
      DTC B1497 is output B

    B

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

    A

    END

  11. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING HARNESS)


    1. A01CAL4E01

      Disconnect the rear air conditioning harness assembly connector.

    2. Disconnect the A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-23 (RBBU) - M19-4 (RBBU) Always Below 1 Ω
      G34-1 (RBUS) - M19-3 (RBUS) Always Below 1 Ω
      G34-21 (RBUG) - M19-2 (RBUG) Always Below 1 Ω
      G34-23 (RBBU) - Body ground Always 10 kΩ or higher
      G34-1 (RBUS) - Body ground Always 10 kΩ or higher
      G34-21 (RBUG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. REPLACE REAR AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the rear air conditioning harness assembly Click here.

      Tech Tips

      Since the rear air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the rear air conditioning harness assembly 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 is not output A
      DTC B1497 is output B

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE) Click here

    A

    END

  13. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01CB16E01

      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
      G33-21 (B) - Body ground Always 11 to 14 V
      G34-24 (+B2) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here