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

  • *1: for Dual Type

  • *2: for Single Type

  • *3: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

E235674E40
E266895E18

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 GTSClick 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick 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-ASSEMBLYClick here

    D

    REPLACE MODE DAMPER SERVO SUB-ASSEMBLYClick 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

      Tip:

      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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick 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

      Tip:

      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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here

  6. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

    1. Replace the recirculation damper servo sub-assembly.

      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 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here

  7. REPLACE MODE DAMPER SERVO SUB-ASSEMBLY

    1. Replace the mode damper servo sub-assembly.

      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 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick 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-ASSEMBLYClick here

    C

    REPLACE MODE DAMPER SERVO SUB-ASSEMBLYClick here

    A

  10. REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY

    1. Replace the air mix damper servo sub-assembly.

      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 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here

  11. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

    1. Replace the recirculation damper servo sub-assembly.

      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 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

    REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here

  12. REPLACE MODE DAMPER SERVO SUB-ASSEMBLY

    1. Replace the mode damper servo sub-assembly.

      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 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

      Tip:

      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