AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1441

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

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (air mix) 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 these signals to move the No. 1 air conditioning radiator damper servo sub-assembly (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
B1441 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. 1 air conditioning radiator damper servo sub-assembly (air mix)

  • No. 1 air conditioning radiator damper servo sub-assembly (air mix)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

  • Air conditioning radiator assembly

Memorized

(30 sec. or more)*

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition No. 1 air conditioning radiator damper servo sub-assembly (air mix) operating ○ ○
Malfunction Air mix damper servo operation request signals are output but the front passenger side air mix damper position sensor value does not change ○ -
Air mix damper servo operation request signals are output but the front passenger side air mix damper position sensor value is abnormal - ○
Detection Time Continuously for 30 seconds or more Continuously for 30 seconds or more
Trip Count 1 trip 1 trip

Tech Tips

If the conditions of either of these patterns are detected, a DTC will be stored

WIRING DIAGRAM

B00708CE05

CAUTION / NOTICE / HINT

Tech Tips


  • Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.

  • When installing a damper servo motor, make sure to install it correctly.

    Click here

  • After replacing a damper servo motor, make sure to perform Servo Motor Initialization.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B1497 is output A
      DTC B1441, B1442 and B1443 are output B
      Only DTC B1441 is output C

    A

    GO TO DTC B1497 Click here

    B

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    C

  2. INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)


    1. Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

      OK
      The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY Click here

    OK

  3. INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)


    1. Check for a wire harness caught between the links of the motors and dampers.

      OK
      No wire harnesses are caught between the links of the motors and dampers.
      Result
      Proceed to
      OK
      NG

    NG

    REMOVE PINCHED WIRE HARNESS

    OK

  4. INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)


    1. Remove the No. 1 air conditioning radiator damper servo sub-assembly.

      Click here

    2. Operate the dampers by hand.

      OK
      The dampers are easily operated by hand.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here