AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1448/48

DTC Code DTC Name
B1448/48 Passenger Side FACE Servo Motor Circuit

DESCRIPTION

The air outlet damper servo motor (for front passenger side mode) 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 air outlet damper (for front passenger side mode) 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
B1448/48 The air outlet damper position does not change even if the air conditioning amplifier assembly operates the air outlet damper servo motor.

  • Air outlet damper servo motor (for front passenger side mode)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01X3RBE11
A01X3RBE12

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (AIR OUTLET DAMPER SERVO MOTOR)


    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
      A/O Damper FACE Pos(P)

      Air outlet damper servo motor (for front passenger side mode) target pulse /

      Min.: 6, Max.: 117 (for LHD)

      Min.: 9, Max.: 120 (for RHD)

      for LHD


      • FACE1: 117 (pulse)

      • FACE2: 109 (pulse)

      • B/L1: 93 (pulse)

      • B/L2: 81 (pulse)

      • FOOT-F: 41 (pulse)

      • FOOT-R: 41 (pulse)

      • FOOT-D: 52 (pulse)

      • F/D: 18 (pulse)

      • DEF: 6 (pulse)

      for RHD


      • FACE1: 9 (pulse)

      • FACE2: 17 (pulse)

      • B/L1: 33 (pulse)

      • B/L2: 45 (pulse)

      • FOOT-F: 85 (pulse)

      • FOOT-R: 85 (pulse)

      • FOOT-D: 74 (pulse)

      • F/D: 108 (pulse)

      • DEF: 120 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      OK (Checking from the DTC) A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      NG C

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK AIR OUTLET DAMPER SERVO MOTOR (FOR FRONT PASSENGER SIDE MODE)


    1. Replace the air outlet damper servo motor (for front passenger side mode).


      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.

      Result
      Result Proceed to
      DTC B1448/482 is not output A
      DTC B1448/48 is output B

    A

    END (AIR OUTLET DAMPER SERVO MOTOR [FOR FRONT PASSENGER SIDE MODE] IS DEFECTIVE)

    B

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.


    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1448/48 is not output A
      DTC B1448/48 is output B

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here