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

Any of the following conditions is met:


  • Error in communication line.

  • Open in communication line.

  • Harness or connector

  • No. 1 air conditioning radiator damper servo sub-assembly (for mode switching)

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

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

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

  • Air conditioning harness assembly

  • 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 brackets.

DTC Detection Conditions:
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The power switch is/was on (IG) ○ ○
Malfunction Status Error in communication line. ○ -
Open in communication line. - ○
Detection Time 10 seconds or more 10 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A01MHLLE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following 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. Perform the Active Test according to the display on the GTS.


      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 (for driver side air mix) pulse

      Min.: 128

      Max.: 383

      for LHD:

      Operates between 133 to 220 pulse

      for RHD:

      Operates between 134 to 221 pulses
      Air Mix Servo Targ Pulse(P) No. 3 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) pulse

      Min.: 128

      Max.: 383

      for LHD:

      Operates between 134 to 221 pulse

      for RHD:

      Operates between 133 to 220 pulses
      Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (for mode switching) pulse

      Min.: 128

      Max.: 383

      		 Operates between 133 to 175 pulses
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly (fresh/recirculation damper) pulse

      Min.: 128

      Max.: 383

      		 Operates between 135 to 153 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
      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
      All of the damper servo motors are normally A
      One of the damper servo motors is malfunctioning B
      All of the damper servo motors are malfunctioning C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    B

  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 (for driver side air mix) is malfunctioning A
      Only the No. 3 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) is malfunctioning B
      Only the No. 1 air conditioning radiator damper servo sub-assembly (for mode switching) is malfunctioning C
      Only the No. 1 blower damper servo sub-assembly (fresh/recirculation damper) is malfunctioning D

    B

    CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE AIR MIX) Click here

    C

    CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR MODE SWITCHING) Click here

    D

    CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (FRESH/RECIRCULATION DAMPER) Click here

    A

  3. CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUBA-SSEMBLY (FOR DRIVER SIDE AIR MIX)


    1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (for 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 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 DTC.

      Click here


      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 (FOR DRIVER SIDE AIR MIX) WAS DEFECTIVE)

    B

    GO TO STEP 7 Click here

  4. CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE AIR MIX)


    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (for 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 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 DTC.

      Click here


      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 (FOR FRONT PASSENGER SIDE AIR MIX) WAS DEFECTIVE)

    B

    GO TO STEP 7 Click here

  5. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR MODE SWITCHING)


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (for mode switching).

      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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTC.

      Click here


      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 (FOR MODE SWITCHING) WAS DEFECTIVE)

    B

    GO TO STEP 7 Click here

  6. CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (FRESH/RECIRCULATION DAMPER)


    1. Replace the No. 1 blower damper servo sub-assembly (fresh/recirculation damper).

      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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTC.

      Click here


      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 (FRESH/RECIRCULATION DAMPER) WAS DEFECTIVE)

    B

  7. CHECK 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. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTC.

      Click here


      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

  8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - POWER SOURCE CIRCUIT)


    1. Disconnect the G43 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G43-21 (B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR