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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 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

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

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

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

  • No. 5 air conditioning radiator damper servo sub-assembly (driver side lower air mix)*2

  • No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix)*3

  • No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*2

  • No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*3

  • No. 3 air conditioning radiator damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly

  • Air conditioning amplifier assembly

Memorized

(10 sec. or more)*1

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the O9 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
      O9-6 (+B1) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

    CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for LHD A
      for RHD B

  3. Click here

    PERFORM ACTIVE TEST USING GTS


    1. Reconnect the O9 air conditioning amplifier assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Perform the Active Test according to the display on the GTS.


      1. Body Electrical > Air Conditioner > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Air Mix Servo Targ Pulse(D) No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 254 to 360 pulses
        Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 152 to 258 pulses
        Air Outlet Servo Pulse (D) No. 3 air conditioning radiator damper servo sub-assembly pulse

        Min.: 128

        Max.: 383

        		 Operates between 140 to 254 pulses
        Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse

        Min.: 128

        Max.: 383

        		 Operates between 206 to 238 pulses
        Cool A/M Servo Pulse(D) No. 5 air conditioning radiator damper servo sub-assembly (driver side lower air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 254 to 360 pulses
        Cool A/M Servo Pulse(P) No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) pulse

        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 pulse

        Min.: 128

        Max.: 383

        		 Operates between 164 to 270 pulses









      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Mix Servo Targ Pulse(D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Mix Servo Targ Pulse(P)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Outlet Servo Pulse (D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Inlet Damper Targ Pulse





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Cool A/M Servo Pulse(D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Cool A/M Servo Pulse(P)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        DEF A/O Servo Pulse(D)




      OK
      Arm of the damper servo motor selected in the Active Test operates smoothly.

    7. 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

  4. Click here

    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. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) is malfunctioning B
      Only the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) is malfunctioning C
      Only the No. 5 air conditioning radiator damper servo sub-assembly (driver side lower air mix) is malfunctioning D
      Only the No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) is malfunctioning E
      Only the No. 3 air conditioning radiator damper servo sub-assembly is malfunctioning F
      Only the No. 1 blower damper servo sub-assembly is malfunctioning G

  5. Click here

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 air conditioning radiator 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


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

    • BClick here

      GO TO STEP 21

  6. Click here

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


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

      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


      1. 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 (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE UPPER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  7. Click here

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


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

      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


      1. 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 (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE UPPER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  8. Click here

    REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER AIR MIX)


    1. Replace the No. 5 air conditioning radiator damper servo sub-assembly (driver side lower air mix).

      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


      1. 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 (NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  9. Click here

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


    1. Replace the No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix).

      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


      1. 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 (NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  10. Click here

    REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 3 air conditioning radiator 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


      1. 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 (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  11. Click here

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower 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


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

    • BClick here

      GO TO STEP 21

  12. Click here

    PERFORM ACTIVE TEST USING GTS


    1. Reconnect the O9 air conditioning amplifier assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Perform the Active Test according to the display on the GTS.


      1. Body Electrical > Air Conditioner > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Air Mix Servo Targ Pulse(D) No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 152 to 258 pulses
        Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 254 to 360 pulses
        Air Outlet Servo Pulse (D) No. 3 air conditioning radiator damper servo sub-assembly pulse

        Min.: 128

        Max.: 383

        		 Operates between 140 to 254 pulses
        Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse

        Min.: 128

        Max.: 383

        		 Operates between 274 to 306 pulses
        Cool A/M Servo Pulse(D) No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) pulse

        Min.: 128

        Max.: 383

        		 Operates between 254 to 360 pulses
        Cool A/M Servo Pulse(P) No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) pulse

        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 pulse

        Min.: 128

        Max.: 383

        		 Operates between 164 to 270 pulses









      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Mix Servo Targ Pulse(D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Mix Servo Targ Pulse(P)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Outlet Servo Pulse (D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Air Inlet Damper Targ Pulse





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Cool A/M Servo Pulse(D)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Cool A/M Servo Pulse(P)





      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        DEF A/O Servo Pulse(D)




      OK
      Arm of the damper servo motor selected in the Active Test operates smoothly.

    7. 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

  13. Click here

    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. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) is malfunctioning B
      Only the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) is malfunctioning C
      Only the No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) is malfunctioning D
      Only the No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) is malfunctioning E
      Only the No. 3 air conditioning radiator damper servo sub-assembly is malfunctioning F
      Only the No. 1 blower damper servo sub-assembly is malfunctioning G

  14. Click here

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 air conditioning radiator 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


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

    • BClick here

      GO TO STEP 21

  15. Click here

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


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

      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


      1. 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 (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE UPPER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  16. Click here

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


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

      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


      1. 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 (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE UPPER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  17. Click here

    REPLACE NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER AIR MIX)


    1. Replace the No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix).

      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


      1. 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 (NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE LOWER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  18. Click here

    REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX)


    1. Replace the No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix).

      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


      1. 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 (NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  19. Click here

    REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 3 air conditioning radiator 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


      1. 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 (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    • BClick here

      GO TO STEP 21

  20. Click here

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower 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


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

    • BClick here
  21. Click here

    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


      1. 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 (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

    • B

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here