AIR CONDITIONING SYSTEM, Diagnostic DTC:B1445/45

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

DESCRIPTION

The damper servo (for passenger side cool air bypass) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the damper servo (for passenger side cool air bypass) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the passenger's head area is controlled.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1445/45 Cool air bypass damper servo motor position sensor value does not change even if air conditioning amplifier operates cool air bypass servo motor

  • Cool air bypass damper servo motor (for passenger side)

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A01H0AAE44

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1445/45 is not output A
      DTC B1445/45 is output B
      DTC B1445/45 and B1497/97 are output C

    B

    READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS SERVO MOTOR TARGET PULSE) Click here

    C

    GO TO DTC B1497/97 Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS SERVO MOTOR TARGET PULSE)


    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 Bypass Target Pulse (P)

      Passenger side COOL air bypass servo motor target pulse /

      for LHD Min.: 6, Max.: 103

      for RHD Min.: 19, Max.: 116

      for LHD:


      • Shut: 6 (pulse)

      • Open: 103 (pulse)

      for RHD:


      • Shut: 116 (pulse)

      • Open: 19 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      The Data List value changes and the cool air bypass servo motor (for passenger side) operates (When troubleshooting according to the DTC output) A
      The Data List value changes and the cool air bypass servo motor (for passenger side) operates (When troubleshooting according to Problem Symptoms Table) B
      The Data List value does not change and the cool air bypass servo motor (for passenger side) does not operate C
      The Data List value changes, but the cool air bypass servo motor (for passenger side) does not operate D

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    CHECK COOL AIR BYPASS SERVO MOTOR (for Passenger Side) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1445/45 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK COOL AIR BYPASS SERVO MOTOR (for Passenger Side)


    1. Replace the cool air bypass 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 B1445/45 is not output.

    NG

    CHECK AIR CONDITIONING HARNESS Click here

    OK

    END (COOL AIR BYPASS SERVO MOTOR (for Passenger Side) IS FAULTY)

  5. CHECK AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1445/45 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END (AIR CONDITIONING HARNESS IS FAULTY)