Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001A3O3
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE; 2019 MY Avalon HV [04/2018 - 08/2019]

PROBLEM SYMPTOMS TABLE

NOTICE:

  • 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.

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 goes 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 Conditioning Assembly is Defective

AIR CONDITIONING CONTROL

Symptom

Suspected Area

Link

Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly)

  • (With the exception of the switch indicators, no inputs are reflected when other switches operated)
  • Air conditioning amplifier assembly
  • Air conditioning control panel (radio and display receiver assembly)

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Operation not Accepted Even If Air Conditioning Switch is Operated

Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly)

  • (Air conditioning system display operates)

Air conditioning control panel (radio and display receiver assembly)

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver 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"

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): INITIALIZATION

A/C switch indicator does not illuminate

  • Air conditioning amplifier assembly
  • Air conditioning control panel (radio and display receiver assembly)
  • A/C switch
  • A/C switch indicator
  • Servo motor
  • Damper and damper link
  • Refrigerant pressure
  • Ambient temperature

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): A/C Switch Indicator does not Turn On

COOLING FUNCTION

Symptom

Suspected Area

Link

No cool air comes out

  • (Blower control is normal)
  • Compressor with motor assembly
  • Refrigerant pressure
  • Refrigerant volume
  • Cooler condenser assembly
  • Cooling fan system
  • Damper and damper link
  • No. 1 cooler thermistor
  • High inlet air temperature

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): No Cool Air Comes Out

  • Cooling effectiveness is poor
  • Cooling response is slow
  • ECO switch assembly (electric parking brake switch assembly)
  • Compressor with motor assembly
  • Refrigerant volume
  • Cooler condenser assembly
  • Cooling fan system
  • Damper and damper link
  • Automatic light control sensor
  • High inlet air temperature
  • Harness or connector

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Cooling is Poor

Temperature of outlet air is cooler on left or right side

  • (when same temperature set for both sides)
  • Compressor with motor assembly
  • Refrigerant volume
  • Damper and damper link
  • Automatic light control sensor
  • Harness or connector

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

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
  • No. 1 air conditioning radiator damper servo sub-assembly
  • Damper and damper link
  • Warm-up control
  • Blockage in heater radiator unit sub-assembly
  • Quick heater assembly
  • Heater radiator unit sub-assembly
  • Flow shutting valve (water by-pass hose assembly)

2019 MY Avalon HV [04/2018 - 08/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): No Warm Air Comes Out

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

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

Heating performance is poor when it is cold

  • Quick heater assembly
  • Air conditioning amplifier assembly
  • PTC HTR relay
  • Harness or connector

2019 MY Avalon HV [04/2018 - 08/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): PTC Heater Circuit

BLOWER CONTROL

Symptom

Suspected Area

Link

Blower motor does not operate at all

  • (Air does not blow from registers)
  • Blower motor with fan sub-assembly
  • Air conditioning amplifier assembly
  • Warm-up control
  • Engine coolant temperature sensor
  • Harness or connector

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Blower Motor does not Operate

Airflow volume cannot be changed

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

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Blower Motor Circuit

  • Airflow volume is constantly low
  • Airflow volume sometimes becomes low
  • Blower motor with fan sub-assembly
  • ECO switch assembly (electric parking brake switch assembly)
  • Clean air filter
  • No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins
  • No. 1 cooler thermistor
  • Aspirator

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Weak Blower Output

AIR INLET CONTROL

Symptom

Suspected Area

Link

  • Air inlet mode changes between recirculation/fresh randomly
  • Recirculation/fresh switch indicator is blinking
  • Customize setting*
  • Ambient temperature
  • Refrigerant pressure
  • Air conditioner pressure sensor circuit
  • Engine coolant temperature

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Recirculated/Fresh Air Modes Switch without User Input

  • Air inlet mode cannot be changed between recirculation/fresh
  • Air inlet mode does not change between recirculation/fresh automatically
  • No. 1 blower damper servo sub-assembly
  • Damper link
  • Air inlet damper mechanically locked
  • Air conditioner unit assembly
  • Engine coolant temperature

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Recirculated/Fresh Air Modes do not Switch

  • *: except USA

AIR OUTLET CONTROL

Symptom

Suspected Area

Link

Air outlet mode cannot be changed

  • (air outlet display changes)
  • No. 1 air conditioning radiator damper servo sub-assembly
  • Damper link
  • Air conditioner unit assembly

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Air Vent cannot be Switched

Air outlet mode cannot be changed

  • (air outlet display does not change)

Air conditioning control panel (radio and display receiver assembly)

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

DEFROSTER CONTROL

Symptom

Suspected Area

Link

Windshield frequently fogs up

  • Compressor with motor assembly
  • Refrigerant volume
  • Cooler expansion valve
  • No. 1 air conditioning radiator damper servo sub-assembly
  • Damper and damper link

2019 - 2022 MY Avalon HV [04/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Front Window Fogging