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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Auto A/C) - Circuit Tests & Symptom Tests >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> Air Vent cannot be Switched [12/2019 - 10/2022] >> Procedure

Air Vent cannot be Switched [12/2019 - 10/2022]: Procedure

  1. CHECK AIR OUTLET SERVO MOTOR 
    1. Confirm for which seat the air outlet mode cannot be changed.

      Result

      Result Proceed to
      The air outlet mode for the driver seat cannot be changed A
      The air outlet mode for the front passenger seat cannot be changed B
      The air outlet mode for the rear seats cannot be changed C

    Result: 

    B 

    See step  4

    Result: 

    C 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 
    1. Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

      OK

      The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY. Refer to  REASSEMBLY [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  3

  3. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B1443 is not output A
      B1443 is output B

    Result: 

    A 

    REPLACE AIR CONDITIONING RADIATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    B 

    GO TO DTC B1443. Refer to  DTC B1443: Air Outlet Damper Control Servo Motor Circuit [12/2019 - 10/2022] 

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

    Result: 

    NG 

    INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY. Refer to  REASSEMBLY [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  5

  5. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B1448 is not output A
      B1448 is output B

    Result: 

    A 

    REPLACE AIR CONDITIONING RADIATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    B 

    GO TO DTC B1448. Refer to  DTC B1448: FACE Servo Motor Circuit (Passenger Side) [12/2019 - 10/2022] 

  6. CHECK REAR MODE DAMPER SERVO SUB-ASSEMBLY 
    1. Check that the rear mode damper servo sub-assembly is installed correctly.

      OK

      The rear mode damper servo sub-assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL REAR MODE DAMPER SERVO SUB-ASSEMBLY. Refer to  REASSEMBLY [12/2019 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B1449 is not output A
      B1449 is output B

    Result: 

    A 

    REPLACE REAR COOLING UNIT ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    B 

    GO TO DTC B1449. Refer to  DTC B1449: Air Outlet Damper Control Servo Motor Circuit (Rear) [12/2019 - 11/2023] 

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