Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028C3C
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): PROBLEM SYMPTOMS TABLE; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Perform the inspection when the vehicle is at ambient temperature. If this is not done, there could be a risk of injury depending on the location being inspected.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
  • The air conditioning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING 2024 - 2025 MY Corolla Corolla Hatchback GR Corolla [08/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE CHECK ITEMS

HINT:

  • 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 opinion may not be consistent with the actual problem (eg: the cooling performance of the air conditioner 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 conditioner 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 turns off when initialization has finished.
  • If the performance of the air conditioner is poor or there is a foul odor, check for clogging in the clean air filter.

Malfunction Operation/Function:

Common Function of Cool and Heater Function

Only Cool Air Function

Only Heater Function

Suspected Area

A/C Switch Operation

Blower Operation

Recirculation/Fresh Function

Air Outlet Changing Function

x

o

o

o

x

x

Go to "Problem Symptoms Table: Air Conditioning Control"

o

o

o

o

x

o

Go to "Problem Symptoms Table: Cooling Function"

o

o

o

o

o

x

Go to "Problem Symptoms Table: Heater Function"

o

x

o

o

x

x

Go to "Problem Symptoms Table: Blower Control"

o

o

x

o

x

x

Go to "Problem Symptoms Table: Air Inlet Control"

o

o

o

x

x

x

Go to "Problem Symptoms Table: Air Outlet Control"

x

x

x

x

x

x

Air Conditioning Amplifier Assembly or Air Conditioner Unit Assembly is Defective

AIR CONDITIONING CONTROL

Symptom

Suspected Area

Link

Air conditioning system cannot be operated using air conditioning control assembly

  • (With the exception of the switch indicators, no inputs are reflected when other switches operated)
  • LIN communication line (air conditioning amplifier assembly - air conditioning control assembly)
  • +B or ground in air conditioning amplifier assembly circuit
  • Air conditioning amplifier assembly
  • Air conditioning control assembly
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Operation not Accepted Even If Air Conditioning Switch is Operated

Air conditioning system cannot be operated using air conditioning control assembly

  • (Air conditioning system display operates)
  • Air conditioning control assembly

2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING PANEL: REMOVAL

Air conditioning system cannot be operated using air conditioning control assembly immediately after starting the engine

  • (Air conditioning system display operates)

    (Only AUTO indicator illuminates)

    (A/C switch indicator does not illuminate)

  • Refer to "INITIALIZATION"

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): INITIALIZATION

A/C switch indicator does not illuminate

  • Air conditioning amplifier assembly
  • Air conditioning control assembly
  • Servo motor
  • Damper and damper link
  • Refrigerant pressure
  • Ambient temperature

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): A/C Switch Indicator does not Turn On

COOLING FUNCTION

Symptom

Suspected Area

Link

Cool air is not discharged

  • (Air is discharged)
  • Compressor with pully assembly
  • Refrigerant pressure
  • Refrigerant volume
  • Cooler condenser assembly
  • Cooling fan system
  • Damper and damper link
  • Evaporator temperature sensor

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): No Cooling at All

  • Cooling effectiveness is poor
  • Cooling response is slow
  • Drive mode select switch (combination switch assembly)
  • Compressor with pully assembly
  • Refrigerant volume
  • Cooler condenser assembly
  • Cooling fan system
  • Damper and damper link
  • Solar sensor (cooler thermistor)*2
  • Solar sensor (automatic light control sensor)*3
  • High inlet air temperature
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Cooling is Poor

Temperature of outlet air is cooler on left or right side*1

  • (When same temperature set for both sides)
  • Compressor with pully assembly
  • Refrigerant volume
  • Damper and damper link
  • Solar sensor (cooler thermistor)*2
  • Solar sensor (automatic light control sensor)*3
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: 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)

  • *1: for Dual Type
  • *2: w/o Automatic Light Control
  • *3: w/ Automatic Light Control

HEATER FUNCTION

Symptom

Suspected Area

Link

  • No warm air comes out

    (Blower control is normal)

  • Outlet air temperature does not increase

    (Blower control is normal)

  • Engine coolant temperature
  • Refrigerant volume
  • Damper and damper link
  • Warm-up control
  • Heater radiator unit sub-assembly

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): No Heating at All

Temperature of outlet air is warmer on left or right side*

  • (When same temperature set for both sides)
  • Damper and damper link
  • Blockage in heater radiator unit sub-assembly
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: 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)

  • *: for Dual Type

BLOWER CONTROL

Symptom

Suspected Area

Link

No air flows from the registers

  • Blower motor with fan sub-assembly
  • Air conditioning amplifier assembly
  • Warm-up control
  • Engine coolant temperature sensor
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Blower Motor does not Operate

Airflow volume cannot be changed

  • Air conditioning amplifier assembly
  • Blower motor with fan sub-assembly
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Blower Motor Circuit

  • Airflow volume is constantly low
  • Airflow volume sometimes becomes low
  • Drive mode select switch (combination switch assembly)
  • Blower motor with fan sub-assembly
  • Air conditioning amplifier assembly
  • Clean air filter
  • Evaporator or heater radiator fins
  • Evaporator temp. sensor
  • Aspirator pipe not connected properly
  • Harness or connector

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Weak Blower Output

AIR INLET CONTROL

Symptom

Suspected Area

Link

  • Recirculation/fresh mode changes without permission
  • Recirculation/fresh mode light blinks
  • Customize setting
  • Ambient temperature
  • Refrigerant pressure
  • Air conditioning pressure sensor circuit
  • Engine coolant temperature

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Recirculated/Fresh Air Modes Switch without User Input

  • Air inlet mode cannot be changed between recirculation/fresh
  • Exhaust gas odors can be smelled when air inlet mode set to recirculation mode
  • Servo motor
  • Damper and damper link
  • Engine coolant temperature
  • Air conditioner unit assembly

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Recirculated/Fresh Air Modes do not Switch

AIR OUTLET CONTROL

Symptom

Suspected Area

Link

Air outlet mode cannot be changed

  • (Air outlet display changes)
  • Servo motor
  • Damper link
  • Air conditioner unit assembly

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Air Vent cannot be Switched

Air outlet mode cannot be changed

  • (Air outlet display does not change)
  • Air conditioning control assembly

2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING PANEL: REMOVAL

DEFROSTER CONTROL

Symptom

Suspected Area

Link

Windshield frequently fogs up

  • Compressor with pully assembly
  • Refrigerant volume
  • Servo motor
  • Damper and damper link
  • Cooler expansion valve
  • Mechanical locking of damper and damper link

2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Front Window Fogging