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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1497/97

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DTC Code DTC Name
B1497/97 BUS IC Communication Malfunction
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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
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST 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 Electrical / Air Conditioner / Active Test.

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

      Table 1. Air Conditioner
      Tester Display Test Part Control Range Diagnostic note
      Air Mix Servo Targ Pulse(D) Air mix control servo motor pulse (D side) Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse(P) Air mix control servo motor pulse (P side) Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (D) Air outlet control servo motor pulse Min.: 0, Max. :255 -
      Air Inlet Damper Targ Pulse Air inlet control servo motor 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

  2. Click here

    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

  3. Click here

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


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

      Tip:

      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

  4. Click here

    REPLACE AIR INLET CONTROL SERVO MOTOR


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

      Tip:

      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

  5. Click here

    REPLACE AIR OUTLET CONTROL SERVO MOTOR


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

      Tip:

      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

  6. Click here

    REPLACE AIR MIX CONTROL SERVO MOTOR (FOR DRIVER SIDE)


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

      Tip:

      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

  7. Click here

    REPLACE AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness (Click here).

      Tip:

      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

  8. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01NLU8E04

      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
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

  9. Click here

    REPLACE A/C AMPLIFIERClick here

  10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

    END