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 the 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 No. Detection Item DTC Detection Condition Trouble Area Memory
B1497/97 BUS IC Communication Malfunction Error or open in communication line

  • Air conditioning harness assembly

  • Air mix damper servo sub-assembly (for driver side)*1

  • Air mix damper servo sub-assembly (for front passenger side)*1

  • Air mix damper servo sub-assembly*2

  • Mode damper servo sub-assembly

  • Recirculation damper servo sub-assembly

  • Air conditioning amplifier assembly

Memorized

(10 sec. or more)*3

WIRING DIAGRAM

A01TBBUE33
A01TDKDE10

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CONFIRM MODEL

    Result
    Result Proceed to
    for Dual Type A
    for Single Type B

    B

    PERFORM ACTIVE TEST USING GTS Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) Air mix damper servo sub-assembly (for driver side) pulse Min.: 0, Max.: 255

        for LHD:

      • Operates between 5 and 92 pulses


        for RHD:

      • Operates between 6 and 93 pulses
      Air Mix Servo Targ Pulse(P) Air mix damper servo sub-assembly (for front passenger side) pulse Min.: 0, Max.: 255

        for LHD:

      • Operates between 6 and 93 pulses


        for RHD:

      • Operates between 5 and 92 pulses
      Air Outlet Servo Pulse (D) Mode damper servo sub-assembly pulse Min.: 0, Max.: 255 Operates between 5 and 47 pulses
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly pulse Min.: 0, Max.: 255

        for LHD:

      • Operates between 7 and 19 pulses


        for RHD:

      • Operates between 7 and 25 pulses

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Servo Pulse (D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Inlet Damper Targ Pulse
      OK
      Arm of the damper servo motor selected in the Active Test operates smoothly.

    6. 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

    GO TO STEP 13 Click here

    A

  3. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the air conditioning damper servo sub-assembly (for driver side) is malfunctioning A
      Only the air conditioning damper servo sub-assembly (for front passenger side) is malfunctioning B
      Only the recirculation damper servo sub-assembly is malfunctioning C
      Only the mode damper servo sub-assembly is malfunctioning D

    B

    REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY (for Front Passenger Side) Click here

    C

    REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Click here

    D

    REPLACE MODE DAMPER SERVO SUB-ASSEMBLY Click here

    A

  4. REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY (for Driver Side)


    1. Replace the air mix damper servo sub-assembly (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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  5. REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY (for Front Passenger Side)


    1. Replace the air mix damper servo sub-assembly (for front 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  6. 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  7. REPLACE MODE DAMPER SERVO SUB-ASSEMBLY


    1. Replace the mode 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  8. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) Air mix damper servo sub-assembly pulse Min.: 0, Max.: 255

        for LHD:

      • Operates between 5 and 92 pulses


        for RHD:

      • Operates between 6 and 93 pulses
      Air Outlet Servo Pulse (D) Mode damper servo sub-assembly pulse Min.: 0, Max.: 255 Operates between 5 and 47 pulses
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly pulse Min.: 0, Max.: 255

        for LHD:

      • Operates between 7 and 19 pulses


        for RHD:

      • Operates between 7 and 25 pulses

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Servo Pulse (D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Inlet Damper Targ Pulse
      OK
      Arm of the damper servo motor selected in the Active Test moves smoothly.

    6. 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

    GO TO STEP 13 Click here

    A

  9. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the air mix damper servo sub-assembly is malfunctioning A
      Only the recirculation damper servo sub-assembly is malfunctioning B
      Only the mode damper servo sub-assembly is malfunctioning C

    B

    REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Click here

    C

    REPLACE MODE DAMPER SERVO SUB-ASSEMBLY Click here

    A

  10. REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY


    1. Replace the air mix 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  11. 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

    GO TO STEP 13 Click here

  12. REPLACE MODE DAMPER SERVO SUB-ASSEMBLY


    1. Replace the mode 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

  13. 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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

    A

    END

    B

  14. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the E28 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
      E28-21 (B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR