AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor), Diagnostic DTC:B1454

DTC Code DTC Name
B1454 Air Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

According to signals from the air conditioning amplifier assembly that are based on user operation or air conditioning system control, the No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) actuates the servo motor.

The cold air that has passed through the evaporator and the warm air that has passed through the heater core are regulated to provide output air at the selected temperature.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1454 Air Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)

Any of the following conditions is met:


  • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) drive terminal is open circuit

  • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) drive terminal is short circuit

  • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)

  • Air conditioning harness assembly (heater radiator unit sub-assembly)

  • Air conditioning amplifier assembly

Memorized

(30 seconds or more)

Tech Tips

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

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Ignition switch ON ○ ○
Malfunction Status No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) drive terminal is open circuit ○ -
No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) drive terminal is short circuit - ○
Detection Time 30 seconds or more 30 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM


  1. for LHD

    A001UIWE08

  2. for RHD

    A001UIWE09

CAUTION / NOTICE / HINT

Tech Tips

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

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (LOWER AIR MIX (PASSENGER SIDE))


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Lower Air Mix (Passenger Side) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)

      Min.: 0

      Max.: 100

      Operates between

      0 to 100%

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Lower Air Mix (Passenger Side)
      OK
      No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operates normally.
      Result
      Result Proceed to
      NG (When troubleshooting according to Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG (When troubleshooting according to Problem Symptoms Table) C
      OK (When troubleshooting according to the DTC) D

    B

    INSPECT AIR CONDITIONING HARNESS ASSEMBLY (HEATER RADIATOR UNIT SUB-ASSEMBLY) Click here

    C

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    D

    CHECK FOR DTC Click here

    A

  2. INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) (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

  3. INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)


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

      Click here

    2. Operate the dampers by hand.

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

    NG

    REPLACE No. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) Click here

    OK

  4. INSPECT AIR CONDITIONING HARNESS ASSEMBLY (HEATER RADIATOR UNIT SUB-ASSEMBLY)


    1. Remove the air conditioning harness assembly (heater radiator unit sub-assembly).

      Click here

    2. for LHD


      1. A001XAUC14
        *a

        Front view of wire harness connector

        (to Air Conditioning Amplifier Assembly)
        *b

        Front view of wire harness connector

        (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly (Front Passenger Side Lower Air Mix))

        Measure the resistance according to the value(s) inthe table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        F7A-28 (A1RL) - RL-1 (A1RL) Always Below 1 Ω
        F7A-34 (BRL) - RL-2 (BRL) Always Below 1 Ω
        F7A-23 (A2RL) - RL-3 (A2RL) Always Below 1 Ω
        F7A-26 (B1RL) - RL-4 (B1RL) Always Below 1 Ω
        F7A-25 (B2RL) - RL-6 (B2RL) Always Below 1 Ω
        F7A-28 (A1RL) or RL-1 (A1RL) - Body ground Always 10 kΩ or higher
        F7A-34 (BRL) or RL-2 (BRL) - Body ground Always 10 kΩ or higher
        F7A-23 (A2RL) or RL-3 (A2RL) - Body ground Always 10 kΩ or higher
        F7A-26 (B1RL) or RL-4 (B1RL) - Body ground Always 10 kΩ or higher
        F7A-25 (B2RL) or RL-6 (B2RL) - Body ground Always 10 kΩ or higher

    3. for RHD


      1. A001XAUC13
        *a

        Front view of wire harness connector

        (to Air Conditioning Amplifier Assembly)
        *b

        Front view of wire harness connector

        (to No. 1 Air Conditioning Radiator Damper Servo Sub-assembly (Front Passenger Side Lower Air Mix))

        Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        F7A-20 (A1LL) - LL-1 (A1LL) Always Below 1 Ω
        F7A-14 (BLL) - LL-2 (BLL) Always Below 1 Ω
        F7A-32 (A2LL) - LL-3 (A2LL) Always Below 1 Ω
        F7A-35 (B1LL) - LL-4 (B1LL) Always Below 1 Ω
        F7A-18 (B2LL) - LL-6 (B2LL) Always Below 1 Ω
        F7A-20 (A1LL) or LL-1 (A1LL) - Body ground Always 10 kΩ or higher
        F7A-14 (BLL) or LL-2 (BLL) - Body ground Always 10 kΩ or higher
        F7A-37 (A2LL) or LL-3 (A2LL) - Body ground Always 10 kΩ or higher
        F7A-35 (B1LL) or LL-4 (B1LL) - Body ground Always 10 kΩ or higher
        F7A-18 (B2LL) or LL-6 (B2LL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY (HEATER RADIATOR UNIT SUB-ASSEMBLY Click here

    OK

  5. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX)


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) with a new one or the No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) if it is functioning properly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM ACTIVE TEST USING GTS (UPPER AIR MIX (PASSENGER SIDE))


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Lower Air Mix (Passenger Side) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)

      Min.: 0

      Max.: 100

      Operates between

      0 to 100%

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Lower Air Mix (Passenger Side)
      OK
      No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) Click here

    NG

  7. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here