AIR CONDITIONING SYSTEM, Diagnostic DTC:B1458/58

DTC Code DTC Name
B1458/58 Passenger Side Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION


The air mix damper servo motor (rear RH*1 or LH*2) 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 mix damper servo motor (rear RH*1 or LH*2) to any position. As a result, the amount of air that has passed through the evaporator and is passing through the heater core is adjusted, and the temperature of the air blowing toward the rear passenger side 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
B1458/58 The air mix damper position does not change even if the air conditioning amplifier assembly operates the air mix damper servo motor (rear RH*1 or LH*2).

  • Air mix damper servo motor (rear RH*1 or LH*2)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B00190HE81

PROCEDURE


  1. READ VALUE USING GTS (AIR MIX DAMPER SERVO TARG PLS[P&R P], A/M SERVO ACTUAL PULSE[P&R P])


    • *1: for LHD

    • *2: for RHD


    1. Use the Data List to check if the air mix damper servo motor RH*1 or LH*2 is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pls(F&R P) Air mix damper servo motor (rear RH*1 or LH*2) target pulse / Min.: 128, Max.: 383

        for LHD:

      • MAX COLD: 250 (pulse)

      • MAX HOT: 222 (pulse)


        for RHD:

      • MAX COLD: 262 (pulse)

      • MAX HOT: 290 (pulse)

      • Displayed between 222 and 250 pulse (for LHD)

      • Displayed between 262 and 290 pulse (for RHD)

      • Air mix damper servo motor (rear RH*1 or LH*2) system malfunction
      A/M Servo Actual Pulse(F&R P) Air mix damper servo motor (rear RH*1 or LH*2) actual pulse / Min.: 128, Max.: 383

        for LHD:

      • MAX COLD: 250 (pulse)

      • MAX HOT: 222 (pulse)


        for RHD:

      • MAX COLD: 262 (pulse)

      • MAX HOT: 290 (pulse)

      • Displayed between 222 and 250 pulse (for LHD)

      • Displayed between 262 and 290 pulse (for RHD)

      • Air mix damper servo motor (rear RH*1 or LH*2) system malfunction
      OK
      When the rear temperature adjust switch is turned from MAX COLD to MAX HOT, 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 AIR MIX DAMPER SERVO MOTOR (REAR FRONT [PASSENGER SIDE])


    1. for LHD:


      1. Replace the air mix damper servo motor (rear RH) Click here.

    2. for RHD:


      1. Replace the air mix damper servo motor (rear LH) 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.

    3. Clear the DTCs Click here.

    4. Check for DTCs Click here.

      OK
      DTC B1458/58 is not output.

    OK

    END (AIR MIX DAMPER SERVO MOTOR [REAR FRONT PASSENGER SIDE] 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 B1458/58 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
      DTC B1458/58 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here