AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1441/41

DTC Code DTC Name
B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air.

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1441/41

Air Mix Damper Control Servo Motor Circuit (Passenger Side)

Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

  • No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized (30 seconds or more)

-
Tip:

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

E269946E01

CAUTION / NOTICE / HINT

Note:

When the battery is disconnected, or servo motor or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

Click here

Tip:

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

PROCEDURE

  1. READ VALUE USING GTS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Operate the front passenger side temperature adjustment switch.

    5. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    6. Check the value(s) by referring to the table below.

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Air Mix Servo Targ Pulse(P)

      No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix) target pulse

      Min.: 0

      Max.: 255

      for LHD:

      MAX. COLD: 6 (pulse)

      MAX. HOT: 93 (pulse)

      for RHD:

      MAX. COLD: 92 (pulse)

      MAX. HOT: 5 (pulse)

      -

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Air Mix Servo Targ Pulse(P)

      OK

      The display is as specified in the normal condition column.

    Result

    Result

    Proceed to

    OK (When troubleshooting according to the DTC)

    A

    OK (When troubleshooting according to Problem Symptoms Table)

    B

    NG

    C
    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick hereClick here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    A

  2. CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX)

    1. Replace the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side air mix).

      Click hereClick here

      Tip:

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here

      Body Electrical > Air Conditioner > Trouble Codes

      OK

      DTC B1441/41 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE AIR MIX] IS DEFECTIVE)

    NG

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY

    1. Replace the air conditioning harness assembly.

      Click hereClick here

      Tip:

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Click here

      Body Electrical > Air Conditioner > Trouble Codes

      OK

      DTC B1441/41 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here