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. DTC Detection Condition Trouble Area
B1497/97 Error or open in communication line

  • Air conditioning harness assembly

  • Air mix damper servo sub-assembly

  • Mode damper servo sub-assembly

  • Recirculation damper servo sub-assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A0041IEE02

INSPECTION PROCEDURE

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 power switch on (IG).

    3. Turn the GTS on.

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

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) Air mix damper servo sub-assembly pulse Min.: 0, Max.: 255 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
      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 ASSEMBLY Click here

    A

  2. SYSTEM CHECK


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

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

    B

    REPLACE MODE DAMPER SERVO SUB-ASSEMBLY Click here

    C

    REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Click here

    A

  3. 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 the DTC.

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

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  4. 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 the DTC.

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

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  5. 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 the DTC.

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

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END

  6. 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 the DTC.

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

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    A

    END

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the L14 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
      L14-21 (B) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here