AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1445/45

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

DESCRIPTION

The cool 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 bypass damper servo motor 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 output 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 bypass damper servo motor.

  • Cool bypass damper servo motor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B001WOVE64

PROCEDURE


  1. READ VALUE USING GTS (COOL AIR BYPASS PULSE, COOL AIR BYPASSACTUAL PULSE)


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

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Cool Air Bypass Pulse Cool bypass damper servo motor target pulse / Min.: 128, Max.: 383

      • Shut: 225 (pulse)

      • Open: 254 (pulse)

      • Displayed between 258 and 286 pulse

      • Cool bypass damper servo motor system malfunction
      Cool Air Bypass Actual Pulse Cool bypass damper servo motor actual pulse / Min.: 128, Max.: 383

      • Shut: 225 (pulse)

      • Open: 254 (pulse)

      • Displayed between 258 and 286 pulse

      • Cool bypass damper servo motor system malfunction
      OK
      When the cooler temperature 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 COOL BYPASS DAMPER SERVO MOTOR


    1. Replace the cool 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.

      OK
      DTC B1445/45 is not output.

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


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


    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1445/45 is not output.

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    NG

    END (COOL BYPASS DAMPER SERVO MOTOR WAS DEFECTIVE)

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1445/45 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here