AIR CONDITIONING SYSTEM, Diagnostic DTC:B1486/86

DTC Code DTC Name
B1486/86 Driver Side Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode damper servo motor (rear) 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 mode damper servo motor (rear) 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
B1486/86 The air outlet damper position does not change even if the air conditioning amplifier assembly operates the mode damper servo motor (rear).

  • Mode damper servo motor (rear)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B00190HE82

PROCEDURE


  1. READ VALUE USING GTS (AIR OUTLET SERVO PLS [FR& D], A/O SERVO ACTUAL PLSE[FR& D])


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

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Outlet Servo Pls (F&R D) Mode damper servo motor (rear) 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

      • Mode damper servo motor (rear) system malfunction
      A/O Servo Actual Plse(F&R D) Mode damper servo motor (rear) 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

      • Mode damper servo motor (rear) system malfunction
      OK
      When the rear 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 MODE DAMPER SERVO MOTOR (REAR)


    1. Replace the mode damper servo motor (rear) 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 B1486/86 is not output.

    OK

    END (MODE DAMPER SERVO MOTOR [REAR] WAS DEFECTIVE)

    NG

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly with a new or known good one Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1486/86 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

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here