AIR CONDITIONING SYSTEM, Diagnostic DTC:B1445/45

DTC Code DTC Name
B1445/45 Passenger Side Cool Air Bypass Damper Control

DESCRIPTION

The cool air bypass 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 cool air bypass damper to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the head area is controlled.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1445/45 The cool air bypass damper position does not change even if the air conditioning amplifier assembly operates the cool air bypass damper servo motor.

  • Cool air bypass damper servo motor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01ER04E24
A01ER04E25

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS 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
      Cool Air Bypass Pulse

      Cool air bypass damper servo motor target pulse /

      Min.: 6, Max.: 57

      Shut: 6 (pulse)

      Open: 57 (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 COOL AIR BYPASS DAMPER SERVO MOTOR


    1. Replace the cool air bypass damper servo motor.


      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 B1445/45 is not output A
      DTC B1445/45 is output B

    B

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (COOL AIR BYPASS DAMPER SERVO MOTOR IS DEFECTIVE)

  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 B1445/45 is not output A
      DTC B1445/45 is output B

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)