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AIR CONDITIONING SYSTEM (for Automatic 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 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.

  • Recirculation damper servo sub-assembly

  • Damper servo sub-assembly

  • Damper servo sub-assembly

  • Rear air mix damper servo sub-assembly*

  • Rear mode damper servo sub-assembly*

  • Air conditioning harness assembly

  • No. 2 air conditioning harness assembly*

  • Air conditioning amplifier assembly

  • Harness or connector

A01DPHUE01
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    *: w/ Rear Air Conditioning System


    1. A01DP5ZE04

      Disconnect the G24* and G25 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
      G25-21 (B) - Body ground Always 11 to 14 V
      G24-24 (+B2) - Body ground* Always 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G25-14 (GND) - Body ground Always Below 1 Ω
      G24-20 (RGND) - Body ground* Always Below 1 Ω
      Table 1. Text in Illustration
      *A w/ Rear Air Conditioning System
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

  2. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the servo motor operates (Click here).

      Table 2. Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse (D) Damper servo sub-assembly (driver side air mix damper servo) target pulse Min.: 0, Max.: 255 -
      Air Mix Servo Targ Pulse (P) Damper servo sub-assembly (front passenger side air mix damper servo) pulse Min.: 0, Max.: 255 -
      Air Outlet Servo Pulse (D) Damper servo sub-assembly (mode damper servo) pulse Min.: 0, Max.: 255 -
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse Min.: 0, Max.: 255 -
      Rear Air Mix Servo Targ Pulse* Rear air mix damper servo sub-assembly target pulse Min.: 0, Max.: 255 -
      A/O Servo Pulse(Rr D)* Rear mode damper servo sub-assembly pulse Min.: 0, Max.: 255 -

      • *: w/ Rear Air Conditioning System

      OK
      Arm of the servo motor selected in the Active Test moves smoothly

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

      Table 3. Result
      Result Proceed to
      One of the front servo motors is malfunctioning A
      All of the front servo motors are malfunctioning B
      One of the rear servo motors is malfunctioning C
      All of the rear servo motors are malfunctioning D

  3. Click here

    SYSTEM CHECK


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

      Table 4. Result
      Result Proceed to
      Only the damper servo sub-assembly (driver side air mix damper servo) is malfunctioning A
      Only the damper servo sub-assembly (front passenger side air mix damper servo) is malfunctioning B
      Only the damper servo sub-assembly (mode damper servo) is malfunctioning C
      Only the recirculation damper servo sub-assembly is malfunctioning D

  4. Click here

    CHECK DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX DAMPER SERVO)


    1. Replace the damper servo sub-assembly (driver side air mix damper servo) (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 DTCs.

      Table 5. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  5. Click here

    CHECK DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX DAMPER SERVO)


    1. Replace the damper servo sub-assembly (front passenger side air mix damper servo) (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 DTCs.

      Table 6. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  6. Click here

    CHECK DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)


    1. Replace the damper servo sub-assembly (mode damper servo) (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 DTCs.

      Table 7. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  7. Click here

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

    2. Check for DTCs.

      Table 8. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  8. Click here

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

    2. Check for DTCs.

      Table 9. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  9. Click here

    SYSTEM CHECK


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

      Table 10. Result
      Result Proceed to
      Only the rear air mix damper servo sub-assembly is malfunctioning A
      Only the rear mode damper servo sub-assembly is malfunctioning B

  10. Click here

    CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY


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

    2. Check for DTCs.

      Table 11. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  11. Click here

    CHECK REAR MODE DAMPER SERVO SUB-ASSEMBLY


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

    2. Check for DTCs.

      Table 12. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  12. Click here

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 2 AIR CONDITIONING HARNESS ASSEMBLY)


    1. Disconnect the Q13 No. 2 air conditioning harness assembly connector.

    2. Disconnect the G24 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G24-23 (RBBU) - Q13-4 (RBBU) Always Below 1 Ω
      G24-1 (RBUS) - Q13-3 (RBUS) Always Below 1 Ω
      G24-21 (RBUG) - Q13-2 (RBUG) Always Below 1 Ω
      G24-23 (RBBU) - Body ground Always 10 kΩ or higher
      G24-1 (RBUS) - Body ground Always 10 kΩ or higher
      G24-21 (RBUG) - Body ground Always 10 kΩ or higher

  13. Click here

    REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the No. 2 air conditioning harness assembly (Click here).

      Tip:

      Since the No. 2 air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the No. 2 air conditioning harness assembly with a new or a known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Table 13. Result
      Result Proceed to
      DTC B1497/97 is not output A
      DTC B1497/97 is output B

  14. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. Click here

    END (DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE AIR MIX DAMPER SERVO] IS FAULTY)

  16. Click here

    END (DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE AIR MIX DAMPER SERVO] IS FAULTY)

  17. Click here

    END (DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)

  18. Click here

    END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

  19. Click here

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

  20. Click here

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

  21. Click here

    END (REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

  22. Click here

    END (REAR MODE DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

  23. Click here

    END (NO. 2 AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)