AIR CONDITIONING SYSTEM (for Automatic 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 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
B1497/97 An open circuit or malfunction in the communication line.

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

  • Air mix control servo motor LH

  • Air outlet control servo motor

  • Damper servo sub-assembly

  • Air mix control servo motor RH

  • Harness or connector

WIRING DIAGRAM

A01ITFYE25

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, using the intelligent tester to generate a control command, and then check that the servo motor operates.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse (D) Air mix control servo motor (for driver side) pulse Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse (P) Air mix control servo motor (for front passenger side) pulse Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (D) Air outlet control servo motor pulse Min.: 0, Max.: 255 -
      Air Inlet Damper Targ Pulse 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
      Malfunction in air mix control servo motor LH A
      Malfunction in air outlet control servo motor B
      Malfunction in damper servo sub-assembly C
      Malfunction in air mix control servo motor RH D
      All of the servo motors are malfunctioning E

    B

    CHECK AIR OUTLET CONTROL SERVO MOTOR Click here

    C

    CHECK DAMPER SERVO SUB-ASSEMBLY Click here

    D

    CHECK AIR MIX CONTROL SERVO MOTOR RH Click here

    E

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

    A

  2. CHECK AIR MIX CONTROL SERVO MOTOR LH


    1. Replace the air mix control servo motor 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 DTCs.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  3. CHECK AIR OUTLET CONTROL SERVO MOTOR


    1. Replace the air outlet control servo motor 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 DTCs.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  4. CHECK DAMPER SERVO SUB-ASSEMBLY


    1. Replace the 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 DTCs.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  5. CHECK AIR MIX CONTROL SERVO MOTOR RH


    1. Replace the air mix control servo motor 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 DTCs.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  6. CHECK 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 DTCs.

      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 ASSEMBLY - BATTERY) Click here

    A

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


    1. A01IO2TE26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the H46 air conditioning amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H46-21 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here