AIR CONDITIONING SYSTEM, Diagnostic DTC:B1443

DTC Code DTC Name
B1443 Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) 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 (driver side MODE FACE) to the appropriate position, which controls the air outlet switching.

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 Diagnosis Condition Trouble Area Memory
B1443 Air Outlet Damper Control Servo Motor Circuit

  • Diagnosis condition: During No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

  • No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized
DTC Diagnosis Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition During No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) operation ○ ○
Malfunction Status The damper servo operation request signal is output but the position information of the servo does not change ○ -
The damper servo operation request signal is output but the position information of the servo is malfunctioning - ○
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 match either of these patterns, a DTC will be output.

WIRING DIAGRAM


  1. for LHD:

    Figure 1. for 4 Zone Type:

    B006AWLE48

    Figure 2. for Dual Type:

    B006AWLE76

  2. for RHD:

    Figure 3. for 4 Zone Type:

    B006AWLE77

    Figure 4. for Dual Type:

    B006AWLE76

CAUTION / NOTICE / HINT

Note


  • 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.

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

  • When the servo motor is replaced, be sure to perform servo motor initialization.

    Click here

Tech Tips

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1443 is output A
      DTC B1443 and B1497 are output. B

    B

    GO TO DTC B1497 Click here

    A

  2. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


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

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

    NG

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

    OK

  3. CHECK 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. CHECK 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

    NG

    REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

    OK

  5. PERFORM ACTIVE TEST USING GTS (FOOT A/O SERVO PULSE(D))


    • *1: for 4 Zone Type

    • *2: for Dual Type


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

      Click here

    2. Connect the No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT)*1 or No. 1 air conditioning radiator damper servo sub-assembly (MODE FOOT)*2 connector to No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE)*1 or No. 1 air conditioning radiator damper servo sub-assembly (MODE FACE)*2.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

    6. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    7. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Restrict Condition
      Foot A/O Servo Pulse(D)

        for 4 Zone Type:

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) operation*


        for Dual Type:

      • No. 1 air conditioning radiator damper servo sub-assembly (MODE FOOT) operation*

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 258 and 365 pulses


        for RHD:

      • Operates between 147 to 254 pulses

      • *: Actually operates the No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE)*1 or No. 1 air conditioning radiator damper servo sub-assembly (MODE FACE)*2.


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Foot A/O Servo Pulse(D)
      OK
      No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE)*1 or No. 1 air conditioning radiator damper servo sub-assembly (MODE FACE)*2 is operated.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    NG

  6. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Interchange the MODE FACE servo motor with MODE FOOT servo motor and connect the connectors to them.

      Click here

    2. Clear the DTCs.

      Click here

    3. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC B1455 is output A
      DTC B1443 is output B
      DTCs are not output C

      Tech Tips

      Codes other than DTC B1443 and B1455 may be output at this time, but they are not related to this check.


    A

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

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    USE SIMULATION METHOD TO CHECK Click here