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

  • No. 1 air conditioning radiator damper servo sub-assembly

  • No. 2 air conditioning radiator damper servo sub-assembly (driver side air mix)

  • No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

  • No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*2

  • No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*3

  • No. 4 air conditioning radiator damper servo sub-assembly

  • No. 5 air conditioning radiator damper servo sub-assembly

  • No. 6 air conditioning radiator damper servo sub-assembly*1

  • No. 7 air conditioning radiator damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly

  • No. 3 air conditioning radiator damper servo sub-assembly (rear air mix)*1

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01FDTKE09

INSPECTION PROCEDURE

Note


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

  • When the battery is disconnected, or a servo motor or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization Click here.

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    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) No. 2 air conditioning radiator damper servo sub-assembly (driver side air mix) Min.: 128, Max.: 383

      Operates between 254 to 360 pulses*2

      Operates between 152 to 258 pulses*3
      Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix) Min.: 128, Max.: 383

      Operates between 152 to 258 pulses*2

      Operates between 254 to 360 pulses*3
      Air Outlet Servo Pulse(D) No. 6 air conditioning radiator damper servo sub-assembly*4 Min.: 128, Max.: 383 Operates between 140 to 254 pulses
      No. 5 air conditioning radiator damper servo sub-assembly*5 Min.: 128, Max.: 383 Operates between 258 to 372 pulses
      Air Outlet Servo Pulse(P) No. 5 air conditioning radiator damper servo sub-assembly*6 Min.: 128, Max.: 383 Operates between 258 to 372 pulses
      No. 6 air conditioning radiator damper servo sub-assembly*5 Min.: 128, Max.: 383 Operates between 140 to 254 pulses
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly Min.: 128, Max.: 383

      Operates between 206 to 238 pulses*2

      Operates between 274 to 306 pulses*3
      Cool A/M Servo Pulse(D) No. 4 air conditioning radiator damper servo sub-assembly*2 Min.: 128, Max.: 383 Operates between 254 to 360 pulses
      No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*3 Min.: 128, Max.: 383 Operates between 254 to 360 pulses
      Cool A/M Servo Pulse(P) No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*2 Min.: 128, Max.: 383 Operates between 254 to 360 pulses
      No. 4 air conditioning radiator damper servo sub-assembly*3 Min.: 128, Max.: 383 Operates between 254 to 360 pulses
      A/O Servo Pulse(Rr D) No. 7 air conditioning radiator damper servo sub-assembly Min.: 128, Max.: 383 Operates between 242 to 353 pulses
      Rear Air Mix Servo Targ Pulse*1 No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) Min.: 128, Max.: 383 Operates between 254 to 360 pulses
      DEF A/O Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly Min.: 128, Max.: 383 Operates between 164 to 270 pulses

      • *1: w/ Rear Control Switch

      • *2: for LHD

      • *3: for RHD

      • *4: for LHD or RHD without Rear Control Switch

      • *5: for RHD with Rear Control Switch

      • *6: for LHD with Rear Control Switch

      OK
      Damper servo motors signal changes according to the target pulse specified by the Active Test.

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

      Result
      Result Proceed to
      One of the damper servo motors is malfunctioning (air mix damper servo motor) A
      One of the damper servo motors is malfunctioning (air outlet damper servo motor) B
      Only the No. 1 blower damper servo sub-assembly is malfunctioning C
      All of the damper servo motors are malfunctioning D

    B

    SYSTEM CHECK Click here

    C

    CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY Click here

    D

    CHECK 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 No. 2 air conditioning radiator damper servo sub-assembly (driver side air mix) is malfunctioning A
      Only the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix) is malfunctioning B
      Only the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*1 or No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*2 is malfunctioning C
      Only the No. 4 air conditioning radiator damper servo sub-assembly is malfunctioning D
      Only the No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) is malfunctioning*3 E

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Rear Control Switch


    B

    CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX) Click here

    C

    CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER) OR NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER) Click here

    D

    CHECK NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    E

    CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (REAR AIR MIX) Click here

    A

  3. CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (driver side air mix) 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 DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE AIR MIX] WAS DEFECTIVE)

  4. CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix) 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 DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE AIR MIX] WAS DEFECTIVE)

  5. CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER) OR NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER)


    1. No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower)*1 or No. 3 air conditioning radiator damper servo sub-assembly (driver side lower)*2 Click here.


      • *1: for LHD

      • *2: for RHD

      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 DTCs Click here.

      Result
      Result Proceed to
      DTC B1497/97 is not output (for LHD) A
      DTC B1497/97 is not output (for RHD) B
      DTC B1497/97 is output C

    B

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE LOWER] WAS DEFECTIVE)

    C

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE LOWER] WAS DEFECTIVE)

  6. CHECK NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 4 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

  7. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (REAR AIR MIX)


    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) 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 DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [REAR AIR MIX] WAS DEFECTIVE)

  8. SYSTEM CHECK


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

      Result
      Result Proceed to
      Only the No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning A
      Only the No. 6 air conditioning radiator damper servo sub-assembly is malfunctioning B
      Only the No. 5 air conditioning radiator damper servo sub-assembly is malfunctioning* C
      Only the No. 7 air conditioning radiator damper servo sub-assembly is malfunctioning D

      • *: w/ Rear Control Switch


    B

    CHECK NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    C

    CHECK NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    D

    CHECK NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    A

  9. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

  10. CHECK NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 5 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

  11. CHECK NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 6 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

  12. CHECK NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 7 air conditioning radiator 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

  13. CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

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

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

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

  14. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness 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 a known good one and check that the condition returns to normal.

    2. Check for DTCs Click here.

      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 (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

  15. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01FFHUE04
      Text in Illustration
      *a

      Rear view of harness connector

      (to Air Conditioning Amplifier Assembly)

      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
      N79-6 (+B1) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here