AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS TABLE

Note


  • If the battery voltage is low, the PTC heater may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.


  • Before replacing the ECM, refer to Service Bulletin.

Tech Tips


  • If the battery voltage is low, the PTC heater may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".

    Click here

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.


  1. VEHICLE CHECK ITEMS

    Tech Tips


    • You can reduce the number of systems to check by using the results of the following operation check.

    • Perform the following checks based on customer feedback and the vehicle condition.

    • The customer's operation may not be consistent with the actual problem (eg: the cooling performance of the air conditioning is bad → actually, the wind volume is weak). It is important to check the problem symptoms accurately and judge correctly based on various sources of information.

    • Judgment as to whether the air conditioning panel is normal or abnormal can be judged by checking if the indicator illuminates or turns off when the switch is operated.

    • During servo motor initialization, the AUTO indicator light comes on, and then goes off when initialization has finished.

    • If the performance of the air conditioning is poor or there is a foul odor, check clogging in the clean air filter.

    Common Function of Cool and Heater Function Only Air Function Only Heater Function Suspected Area
    A/C Switch Operation Blower Operation Fresh/Recirculation Function Air Outlet Charging Function
    ○ ○ ○ ○ X ○ Refer to "COOLING FUNCTION:"
    ○ ○ ○ ○ ○ X Refer to "HEATER FUNCTION:"
    X ○ ○ ○ X X Refer to "DISPLAY RELATED:"
    ○ X ○ ○ X X Refer to "BLOWER RELATED:"
    ○ ○ X ○ X X Refer to "INTAKE RELATED:"
    ○ ○ ○ X X X Refer to "AIR OUTLET RELATED:"
    X X X X X X Air Conditioning amplifier or air conditioning unit assembly is defective

  2. DISPLAY RELATED:

    Symptom Suspected Area Link

    Operations are never accepted by the air conditioning control assembly.


    • (With the exception of the switch indicator, everything is turned off.)

    • LIN communication between air conditioning amplifier assembly and air conditioning control assembly

    • Air conditioning amplifier assembly (+B and GND circuit)

    • air conditioning control assembly

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    Operations are never accepted by the air conditioning control assembly.


    • (LCD panel displayed.)

    		 Air conditioning control assembly

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    Operations are never accepted by the air conditioning control assembly only immediately after starting the hybrid control system.


    • (LCD panel displayed.)

    • (Only AUTO indicator illuminates.)

    • (A/C switch indicator light does not illuminate.)

    		 Refer to "INITIALIZATION"

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    A/C switch indicator turns off.

    • Air conditioning amplifier assembly

    • Radio receiver assembly

    • A/C switch (multi-display)

    • Malfunction in one of the servo motors (initialization incomplete)

    • Damper and link operation (jamming)

    • Refrigerant pressure malfunction (low pressure)

    • Low ambient temperature (including thermistor assembly)

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    The air conditioning does not turn on when the engine is started after turning the engine switch off and leaving the vehicle alone 1 hour or more.


    • (Starts at 25.0 when AUTO is pressed.)

    • Air conditioning amplifier assembly (+B short)

    • Malfunction in one of the servo motors (initialization incomplete)

    • Damper and link operation (jamming)

    • Wrong number of electrical key transmitter sub-assembly

    Click here

  3. COOLING FUNCTION:

    Symptom Suspected Area Link

    No cooling at all.


    • (Air is discharged.)

    • Cooler compressor assembly

    • Refrigerant pressure malfunction

    • Quantity of refrigerant gas lack

    • Dirty cooler condenser

    • Cooling fan system malfunction

    • A/M damper and link operation (jamming)

    • No. 1 cooler thermistor (determined as cold, conflicting with actual temperature)

    • Warm air flow

    Click here


    • Cooling is poor.

    • Takes time to cool down.

    • ECO drive mode function (air flow volume is restricted due to ECO drive mode being selected)

    • Cooler compressor assembly

    • Excessive refrigerant

    • Quantity of refrigerant gas lack

    • Dirty cooler condenser

    • Cooling fan system malfunction

    • A/M damper and link operation (jamming)

    • Automatic light control sensor

    • Warm air flow

    Click here

    Different temperature for left and right air outlets.


    • (Left and right stand-alone type)

    • Cooler compressor assembly

    • Quantity of refrigerant gas lack

    • A/M damper and link operation (jamming)

    • Automatic light control sensor

    Click here


    • Cooler compressor assembly cannot be stopped

    • Refrigerant pressure does not drop even if turned off A/C switch

    • Air conditioning amplififer assembly

    • Blower with fan motor sub-assembly

    • Air conditioning control assembly

    • Clean evaporator or heater core fin clogging

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    Cooling is poor (cooling box).

    • Air duct

    • Cooling box assembly

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  4. HEATER FUNCTION:

    Symptom Suspected Area Link

    • No heating at all.


      • (Airflow volume control is normal.)

    • Air outlet temperature does not increase.


      • (Airflow volume control is normal.)

    • Low engine coolant temperature

    • A/M damper and link operation (jamming)

    • Warm-up Control

    • Heater core closed waterway

    • Heater accessory assembly (w/ Heater Accessory)

    Click here

    Different temperature for left and right air outlets.


    • (Either left or right is warm.)

    • Heater accessory assembly (low water) (w/ Heater Accessory)

    • A/M damper and link operation (jamming)

    • Heater core closed waterway

    Click here

    Heating performance is poor when it is cold. (w/ PTC Heater)

    • No. 2 semiconductor power integration ECU

    • Quick heater assembly

    • Air conditioning amplifier assembly

    • Main body ECU (multiplex network body ECU)

    • Harness or connector

    Click here

  5. BLOWER RELATED:

    Symptom Suspected Area Link

    Blower does not operate at all.


    • (No air comes out.)

    • Blower with fan motor sub-assembly (battery and ground circuit)

    • Control signal malfunction between air conditioning assembly and blower with fan motor sub-assembly

    • Blower with fan motor sub-assembly

    • Air conditioning amplifier assembly

    • Warm-up Control

    • Water temperature sensor

    Click here

    Blower airflow volume cannot be changed.

    • Air conditioning amplifier assembly

    • Blower with fan motor sub-assembly

    • Air conditioning control assembly

    • Evaporator or heater core fin clogging

    • Clean air filter clogging

    Click here


    • Blower airflow volume is continuously weak.


    • Blower airflow volume is sometimes weak.

    • Communication signal malfunction between air conditioning assembly and blower with fan motor sub-assembly

    • Blower with fan motor sub-assembly

    • Air conditioning amplifier assembly

    • Evaporator or heater core fin clogging

    • Clean air filter clogging

    • ECO drive mode function (air flow volume is restricted due to ECO drive mode being selected)

    • Aspirator loser

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  6. INTAKE RELATED:

    Symptom Suspected Area Link

    • Fresh/recirculation mode changes without permission.

    • Fresh/recirculation mode light blinks.

    • Automatic function set to ON in the customize setting

    • Change in fresh air temperature

    • Refrigerant pressure drop

    • Pressure sensor circuit

    • High engine coolant temperature

    • Smog ventilation sensor false opinion on Infringement

    Click here


    • Fresh/recirculation mode does not change.

    • Fresh/recirculation mode does not change automatically.

    • Exhaust gas odor when set to recirculation.

    • Blower servo motor malfunction

    • Blower damper and link operation (jamming)

    • Foreign object jammed in door

    • Air conditioning radiator assembly malfunction

    • High engine coolant temperature

    • Smog ventilation sensor false opinion on infringement

    Click here

  7. AIR OUTLET RELATED:

    Symptom Suspected Area Link

    Air vent cannot be changed.


    • (Display changes)

    • Malfunction in one of the servo motors

    • MODE damper and link operation (jamming)

    • Air conditioning unit

    Click here

    Air vent cannot be changed.


    • (Display does not change)

    		 Air conditioning control assembly

    Click here

  8. DEFOGGER RELATED:

    Symptom Suspected Area Link

    Front glass fogs up.


    • (Does not cool)

    • Cooler compressor assembly

    • Quantity of refrigerant gas lack

    • Cooler expansion valve (opened too far)

    • DEF servo motor malfunction

    • Damper and link operation (jamming)

    Click here

  9. OPERATION RELATED:

    Symptom Suspected Area Link

    • Only air conditioning system cannot be operated using the switches on the multi-display (front air conditioning system).

    • Only air conditioning system cannot be operated using the switches on the rear power seat switch (rear multi operation panel) (rear air conditioning system).

    • CAN communication between air conditioning amplifier assembly and radio receiver assembly (front air conditioning system)

    • CAN communication between air conditioning amplifier assembly and rear power seat switch (rear multi operation panel) (rear air conditioning system)

    • Radio receiver assembly (front air conditioning system)

    • Rear power seat switch (rear multi operation panel) (rear air conditioning system)

    • Air conditioning amplifier assembly

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