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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) >> No Cooling at All [12/2019 - 11/2023] >> Procedure

No Cooling at All [12/2019 - 11/2023]: Procedure

  1. CHECK SWITCH INDICATOR 
    1. Operate each switch on the air conditioning control assembly and check that the switch indicators operate normally.

      OK

      All switch indicators operate normally.

      Result

      Result Proceed to
      OK A
      NG (for Air conditioning control assembly) B
      NG (for No. 2 air conditioning control assembly) C

    Result: 

    B 

    GO TO OTHER DIAGNOSIS PROCEDURE (Operation not Accepted Even If Air Conditioning Switch is Operated). Refer to  Operation not Accepted Even If Air Conditioning Switch is Operated [12/2019 - 10/2022]  , or refer to  Operation not Accepted Even If Air Conditioning Switch is Operated [10/2022 - 11/2023]  

    Result: 

    C 

    GO TO OTHER DIAGNOSIS PROCEDURE (Rear Panel Switch Operation not Accepted). Refer to  Rear Panel Switch Operation not Accepted [12/2019 - 11/2023]  

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS (AIR MIX SERVO PULSE) 
    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
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 165 to 257 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 255 to 347 pulses
      Rear Air Mix Servo Targ Pulse Rear air mix damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 213 to 258 pulses

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Rear Air Mix Servo Targ Pulse

      OK

      Damper servo motor is operated.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023] 

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