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 No. DTC Detection Condition Trouble Area
B1497/97 An open circuit or malfunction in the communication line.

  • Air conditioning harness assembly

  • Harness or connector between air conditioning amplifier assembly and power source

  • No. 3 air conditioning radiator damper servo sub-assembly (air mix servo motor for driver side)

  • No. 1 air conditioning radiator damper servo sub-assembly (air mix servo motor for front passenger side)

  • No. 2 air conditioning radiator damper servo sub-assembly (air outlet servo motor)

  • No. 1 blower damper servo sub-assembly (air inlet servo motor)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01UXTCE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, perform the Active Test.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse (D) Air mix servo motor pulse (driver side) Min.: 0, Max.: 255 Perform Active Test when value between 4 and 93 displayed
      Air Mix Servo Targ Pulse (P) Air mix servo motor pulse (front passenger side) Min.: 0, Max.: 255 Perform Active Test when value between 4 and 93 displayed
      Air Outlet Servo Pulse (D) Air outlet servo motor pulse Min.: 0, Max.: 255 Perform Active Test when value between 9 and 101 displayed
      Air Inlet Damper Targ Pulse Air inlet damper target pulse Min.: 0, Max.: 255 Perform Active Test when value between 6 and 22 displayed
      OK
      Arm of the servo motor selected in the Active Test moves smoothly

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

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

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  2. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the No. 3 air conditioning radiator damper servo sub-assembly (air mix servo motor for driver side) is malfunctioning A
      Only the No. 1 air conditioning radiator damper servo sub-assembly (air mix servo motor for front passenger side) is malfunctioning B
      Only the No. 2 air conditioning radiator damper servo sub-assembly (air outlet servo motor) is malfunctioning C
      Only the No. 1 blower damper servo sub-assembly (air inlet servo motor) is malfunctioning D

    B

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR FOR FRONT PASSENGER SIDE) Click here

    C

    REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET SERVO MOTOR) Click here

    D

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET SERVO MOTOR) Click here

    A

  3. REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR FOR DRIVER SIDE)


    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (air mix servo motor 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 a known good one and check that the condition returns to normal.

    2. Check for the DTC Click here.

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

    A

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR FOR DRIVER SIDE) WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  4. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR FOR FRONT PASSENGER SIDE)


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix servo motor 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 a known good one and check that the condition returns to normal.

    2. Check for the DTC Click here.

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

    A

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR FOR FRONT PASSENGER SIDE) WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  5. REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET SERVO MOTOR)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (air outlet servo motor) 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 DTC Click here.

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

    A

    END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET SERVO MOTOR) WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  6. REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET SERVO MOTOR)


    1. Replace the No. 1 blower damper servo sub-assembly (air inlet servo motor) 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 DTC Click here.

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

    A

    END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET SERVO MOTOR) WAS DEFECTIVE)

    B

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

    2. Check for the DTC Click here.

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

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

    B

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

    A01V15TE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

    1. Disconnect the 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
      F29-21 (B) - Body ground Always 11 to 14 V

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR