AIR CONDITIONING SYSTEM, Diagnostic DTC:B1489/89

DTC Code DTC Name
B1489/89 Rear Air Outlet Damper Control Servo Motor RH Circuit

DESCRIPTION

The rear outlet damper servo (for RH side) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear outlet damper (for RH side) to the appropriate position, which controls the air outlet modes.

Tech Tips

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DTC Code DTC Detection Condition Trouble Area
B1489/89 Rear air outlet damper position does not change even if air conditioning amplifier operates rear air outlet damper servo motor

  • Rear air outlet servo motor (for RH side)

  • Rear air conditioning harness

  • Harness or connector between rear air conditioning harness and air conditioning amplifier

  • Air conditioning amplifier

WIRING DIAGRAM

A01GYZZE08

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1489/89 is not output A
      DTC B1489/89 is output B
      DTC B1489/89 and B1497/97 are output C

    B

    READ VALUE USING INTELLIGENT TESTER (REAR AIR OUTLET SERVO MOTOR TARGET PULSE (for RH Side)) Click here

    C

    GO TO DTC B1497/97 Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (REAR AIR OUTLET SERVO MOTOR TARGET PULSE (for RH Side))


    1. Use the Data List to check if the servo motor is functioning properly.

      Air conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Air Outlet Servo Pulse (RP)

      Rear air outlet servo motor target pulse (for RH side)/

      Min.: 8, Max.: 37

      Rear cooler ON: 37 (pulse)

      Air purifier ON: 8 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.

    2. Visually inspect the rear air outlet servo motor (for RH side).


      1. Visually inspect whether the rear air outlet servo motor (for RH side) operates.

        OK
        The rear air outlet servo motor (for RH side) operates.
        Result
        Result Proceed to
        The Data List value changes and the rear air outlet servo motor (for RH side) operates (When troubleshooting according to the DTC output) A
        The Data List value changes and the rear air outlet servo motor (for RH side) operates (When troubleshooting according to Problem Symptoms Table) B
        The Data List value does not change and the rear air outlet servo motor (for RH side) does not operate C
        The Data List value changes, but the rear air outlet servo motor (for RH side) does not operate D

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1489/89 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

    A01GZ97E10

    1. Disconnect the S90 rear air conditioning harness connector.

    2. Disconnect the L76 air conditioning amplifier connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S90-12 (BRRG) - L76-12 (BRRG) Always Below 1 Ω
      S90-11 (BURR) - L76-13 (BURR)
      S90-10 (BRRB) - L76-14 (BRRB)
      L76-12 (BRRG) - Body ground Always 10 kΩ or higher
      L76-13 (BURR) - Body ground
      L76-14 (BRRB) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK REAR AIR OUTLET SERVO MOTOR (for RH Side)


    1. Replace the rear air outlet servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1489/89 is not output.

    NG

    CHECK REAR AIR CONDITIONING HARNESS Click here

    OK

    END (REAR AIR OUTLET SERVO MOTOR (for RH Side) IS FAULTY)

  6. CHECK REAR AIR CONDITIONING HARNESS


    1. Replace the rear air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1489/89 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END (REAR AIR CONDITIONING HARNESS IS FAULTY)