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 servo motors. 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 damper position information to the air conditioning amplifier assembly.

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

  • Air conditioning harness assembly

  • No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)

  • No. 1 blower damper servo sub-assembly

  • No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)

  • No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01X8U8E03

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for the DTC Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. A01XBTAE01

      Disconnect the E81 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
      E81-21 (+B1) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that items operate 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 (air mix damper servo) Min.: 0, Max.: 255 -
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) Min.: 0, Max.: 255 -
      Cool Air Bypass Pulse No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) Min.: 0, Max.: 255 -
      OK
      Arm of the damper servo motor selected in the Active Test moves smoothly.

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

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

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  4. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) is malfunctioning A
      Only the No. 1 blower damper servo sub-assembly is malfunctioning B
      Only the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) is malfunctioning C
      Only the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) is malfunctioning D

    B

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY Click here

    C

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO) Click here

    D

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO) Click here

    A

  5. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)


    1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo).


      Tech Tips

      Since the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) with a new or normally functioning one and check that the condition returns to normal.

    2. Clear the DTC Click here.

    3. Check for the DTC Click here.

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

    A

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] IS FAULTY)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  6. REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Temporarily replace the No. 1 blower damper servo sub-assembly Click here.

      Tech Tips

      Since the No. 1 blower damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the No. 1 blower damper servo sub-assembly with a new or normally functioning one and check that the condition returns to normal.

    2. Clear the DTC Click here.

    3. Check for the DTC Click here.

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

    A

    END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  7. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)


    1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo).


      Tech Tips

      Since the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) with a new or normally functioning one and check that the condition returns to normal.

    2. Clear the DTC Click here.

    3. Check for the DTC Click here.

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

    A

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  8. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)


    1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).


      Tech Tips

      Since the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) with a new or normally functioning one and check that the condition returns to normal.

    2. Clear the DTC Click here.

    3. Check for the DTC Click here.

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

    A

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [COOLER BYPASS DAMPER SERVO] IS FAULTY)

    B

  9. REPLACE AIR CONDITIONING HARNESS ASSEMBLY


    1. Temporarily replace the air conditioning harness assembly.


      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 normally functioning one and check that the condition returns to normal.

    2. Clear the DTC Click here.

    3. Check for the DTC Click here.

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

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here