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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 Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting) [11/2023 - ] >> Procedure

Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting) [11/2023 - ]: Procedure

  1. CHECK MALFUNCTION STATUS 

    Result

    Result  Proceed to
    Malfunction occurs during cooling A
    Malfunction occurs during heating B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK REFRIGERANT SHORTAGE 
    1. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:

      Item Condition
      A/C Switch On
      Ambient Temperature*1 0 to 49°C (32 to 120°F)
      Air Conditioning Air Inlet Temperature*2 25 to 35°C (77 to 95°F)
      Set Temperature MAX COLD
      Recirculation/fresh Control Switch Recirculation
      Air Vent Damper Position FACE
      Blower Speed HI

      HINT: 

      *1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

      *2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

    2. Using the GTS, check the amount of refrigerant.

      Body Electrical > Air Conditioner > Utility 

      Tester Display
      Refrigerant Gas Volume Check
      NOTE:

      If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

      HINT: 

      • If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
      • When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.

      Result

      Result Amount of Refrigerant
      Refrigerant shortage Insufficient or leakage
      Refrigerant correct Correct
      Refrigerant incorrect Incorrect

      OK

      "Refrigerant correct" is displayed on the GTS.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHARGE SYSTEM WITH REFRIGERANT. Refer to  REPLACEMENT [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING GTS 
    1. 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
      Front Left Air Mix Damper Control Servo Motor This test activates the Front Left Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.
      Front Right Air Mix Damper Control Servo Motor This test activates the Front Right Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Left Air Mix Damper Control Servo Motor
      Data List Display
      Front Left Air Mix Damper Control Servo Motor Actual Pulse

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Right Air Mix Damper Control Servo Motor
      Data List Display
      Front Right Air Mix Damper Control Servo Motor Actual Pulse

      OK

      Damper servo motor is operated.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the G5 solar sensor (automatic light control sensor) connector.
    2. Disconnect the H135 main body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G5-1 (CLTB) - H135-8 (CLTB) Always Below 1 Ω
      G5-2 (CLTE) - H135-21 (CLTE) Always Below 1 Ω
      G5-4 (CLTS) - H135-20 (CLTS) Always Below 1 Ω
      G5-1 (CLTB) or H135-8 (CLTB) - Other terminals and body ground Always 10 kΩ or higher
      G5-2 (CLTE) or H135-21 (CLTE) - Other terminals and body ground Always 10 kΩ or higher
      G5-4 (CLTS) or H135-20 (CLTS) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) 

    Refer to ON-VEHICLE INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET. Refer to  ON-VEHICLE INSPECTION [12/2019 - ] 

    Result: 

    NG 

    REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR). Refer to  REMOVAL [12/2019 - ] 

  6. BLEED AIR FROM COOLANT (COOLING SYSTEM) 

    Refer to REPLACEMENT [10/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK OPERATION (AIR CONDITIONING SYSTEM) 
    1. Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.

      OK

      The air from the left and right front registers is the same temperature.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (FAILURE DUE TO AIR ENTERING COOLANT) 

    Result: 

    NG 

    See step  8

  8. PERFORM ACTIVE TEST USING GTS 
    1. 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
      Front Left Air Mix Damper Control Servo Motor This test activates the Front Left Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.
      Front Right Air Mix Damper Control Servo Motor This test activates the Front Right Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Left Air Mix Damper Control Servo Motor
      Data List Display
      Front Left Air Mix Damper Control Servo Motor Actual Pulse

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Right Air Mix Damper Control Servo Motor
      Data List Display
      Front Right Air Mix Damper Control Servo Motor Actual Pulse

      OK

      Damper servo motor is operated.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY. Refer to  DISASSEMBLY [11/2023 - ] 

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

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