AIR CONDITIONING SYSTEM, Diagnostic DTC:B1455/55

DTC Code DTC Name
B1455/55 Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit

DESCRIPTION

DEF mode damper servo motor sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the DEF mode damper servo motor2 to any position, which controls the air outlet changes.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1455/55 The air outlet damper position does not change even if the air conditioning amplifier assembly operates the DEF mode damper servo motor

  • DEF mode damper servo motor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B00190HE79

PROCEDURE


  1. READ VALUE USING GTS (A/O DAMPER DEF POS[D SIDE], A/O DAMPER DEF ACTUAL POS[D])


    1. Use the Data List to check if the DEF mode damper servo motor is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/O Damper DEF Pos(D Side) DEF mode damper servo motor target pulse / Min.: 128, Max.: 383

      • FACE1: 258 (pulse)

      • FACE2: 258 (pulse)

      • B/L1: 277 (pulse)

      • FOOT-O: 290 (pulse)

      • FOOT-D: 290 (pulse)

      • FOOT-R: 290 (pulse)

      • FOOT-F: 307 (pulse)

      • F/D: 316 (pulse)

      • DEF: 328 (pulse)

      • Displayed between 258 and 328 pulse

      • DEF mode damper servo motor system malfunction
      A/O Damper DEF Actual Pos(D) DEF mode damper servo motor actual pulse / Min.: 128, Max.: 383

      • FACE1: 258 (pulse)

      • FACE2: 258 (pulse)

      • B/L1: 277 (pulse)

      • FOOT-O: 290 (pulse)

      • FOOT-D: 290 (pulse)

      • FOOT-R: 290 (pulse)

      • FOOT-F: 307 (pulse)

      • F/D: 316 (pulse)

      • DEF: 328 (pulse)

      • Displayed between 258 and 328 pulse

      • DEF mode damper servo motor system malfunction
      OK
      When the DEF mode switch is turned, the actual pulse changes following the target pulse.
      Result
      Result Proceed to
      Target pulse changes but actual pulse does not change A
      Target pulse and actual pulse do not change B
      Actual pulse changes following the target pulse (When troubleshooting according to the DTC) C
      Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table) D

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    CHECK FOR DTC Click here

    D

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. CHECK DEF MODE DAMPER SERVO MOTOR


    1. Replace the DEF mode damper 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 B1455/55 is not output.

    OK

    END (DEF MODE DAMPER SERVO MOTOR WAS DEFECTIVE)

    NG

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1455/55 is not output.

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1455/55 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here