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. Detection Item DTC Detection Condition Trouble Area Memory Note
B1497/97 BUS IC Communication Malfunction Error or open in communication line

  • Harness or connector

  • Air conditioning harness assembly

  • No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix), (front passenger side air mix), (front mode)

  • No. 1 blower damper servo sub-assembly (recirculation)

  • No. 2 air conditioning harness connector

  • No. 1 rear cooling unit damper servo sub-assembly (rear air mix)

  • No. 2 rear cooling unit damper servo sub-assembly (rear mode)

  • Air conditioning amplifier assembly

 Memorized (10 seconds or more) -

Tech Tips

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the parentheses.

WIRING DIAGRAM

B006PIXE01
B006RJ3E04

CAUTION / NOTICE / HINT

Note


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

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

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND)


    1. B006N3ZC04
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G36-14 (GND) - Body ground Always Below 1 Ω
      G38-24 (GND2) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G36-21 (B) - Body ground Always 11 to 14 V
      G38-28 (+B2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. 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.

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


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

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 165 and 257 pulse


        for RHD:

      • Operates between 255 and 347 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) target pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 255 and 347 pulse


        for RHD:

      • Operates between 165 and 257 pulse
      Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (front mode) target pulse

      Min.: 128

      Max.: 383

      		 Operates between 234 and 348 pulses
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly (recirculation) target pulse

      Min.: 128

      Max.: 383

      		 Operates between 235 and 258 pulses
      Rear Air Mix Servo Targ Pulse No. 1 rear cooling unit damper servo motor sub-assembly (rear air mix) target pulse

      Min.: 128

      Max.: 383

      		 Operates between 254 and 299 pulses
      A/O Servo Pulse(Rr D) No. 2 rear cooling unit damper servo motor sub-assembly (rear mode) pulse

      Min.: 128

      Max.: 383

      		 Operates between 200 and 276 pulses

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

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

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

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

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Air Mix Servo Targ Pulse

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      A/O Servo Pulse(Rr D)
      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
      No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning A
      No. 1 blower damper servo sub-assembly is malfunctioning B
      All front damper servo motors are malfunctioning C
      No. 1 rear cooling unit damper servo sub-assembly is malfunctioning D
      No. 2 rear cooling unit damper servo sub-assembly is malfunctioning E
      All rear damper servo motors are malfunctioning F

    B

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

    C

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    D

    CHECK NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY Click here

    E

    CHECK NO. 2 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY Click here

    F

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

    A

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


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly.


      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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO STEP 6 Click here

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


    1. Replace the No. 1 blower damper servo sub-assembly.


      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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  6. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.


      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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY for LHD: Click here for RHD: Click here

  7. CHECK NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 rear cooling unit damper servo sub-assembly.

      Click here

    2. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)

    NG

    GO TO STEP 9 Click here

  8. CHECK NO. 2 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 2 rear cooling unit damper servo sub-assembly.

      Click here

    2. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 2 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)

    NG

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


    1. Disconnect the G38 air conditioning amplifier assembly connector.

    2. Disconnect the L18 No. 2 air conditioning harness assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G38-1 (RBUS) - L18-3 (RBUS) Always Below 1 Ω
      G38-27 (RBBU) - L18-4 (RBBU) Always Below 1 Ω
      G38-25 (RBUG) - L18-2 (RBUG) Always Below 1 Ω
      G38-1 (RBUS) or L18-3 (RBUS) - Body ground Always 10 kΩ or higher
      G38-27 (RBBU) or L18-4 (RBBU) - Body ground Always 10 kΩ or higher
      G38-25 (RBUG) or L18-2 (RBUG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the No. 2 air conditioning harness assembly.

      Click here

    2. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1497/97 is not output.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here