AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of the A/C system do not operate | IG power source circuit | |
| Back-up power source circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| A/C amplifier | ||
| The blower motor operates by itself or the motor speed changes arbitrarily (Speed does not change in accordance with automatic or manual control settings)*1 | IG signal circuit | |
| Solar ventilation ECU | ||
| Temperature control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Air mix damper control servo motor circuit | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Expansion valve | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 2 engine wire | ||
| Compressor with motor assembly | ||
| Power management control ECU | ||
| Temperature control: No warm air comes out | Air mix damper control servo motor circuit | |
| Engine coolant temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| PTC heater circuit*2 | ||
| CAN communication system | ||
| Radiator unit sub-assembly | ||
| A/C amplifier | ||
| ECM | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume | |
| Refrigerant pressure | ||
| Solar sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Air mix damper control servo motor circuit | ||
| Air inlet damper control servo motor circuit | ||
| PTC heater circuit*2 | ||
| Air conditioning control panel circuit | ||
| Radiator unit sub-assembly | ||
| Expansion valve | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 2 engine wire | ||
| Compressor with motor assembly | ||
| ECM | ||
| Power management control ECU | ||
| Temperature control: No temperature control (only Max. cool or Max. warm) | Air mix damper control servo motor circuit | |
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Solar sensor circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Heater performance is low (engine is stopped)*2 | PTC heater circuit | |
| A/C amplifier | ||
| ECO MODE switch indicator does not come on (ECO MODE switch does not operate) | ECO switch circuit | |
| A/C amplifier | ||
| Pollen removal mode does not operate (A/C system is operating normally) | Air inlet damper control servo motor circuit | |
| Air outlet damper control servo motor circuit | ||
| Blower motor circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Unable to control A/C with the steering pad switch | Steering pad switch circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when power switch is off. | Back-up power source circuit | |
| A/C amplifier |
| Symptom | Suspected Area | See page |
|---|---|---|
| The remote air conditioning system does not operate when the remote A/C switch on the key (electrical transmitter) is pressed. | Wireless door lock control system | |
| Data List (FL Door Courtesy, FR Door Courtesy, RL Door Courtesy SW, RR Door Courtesy SW, Back Door Courtesy SW) | ||
| Data List (Hood Courtesy SW) | ||
| Data List (Start Switch1, Start Switch2) | ||
| Data List (IG SW, ACC SW) | ||
| Data List (FL Door Lock Pos, FR Door Lock Pos, RL-Door Lock Pos SW, RR-Door Lock Pos SW) | ||
| Theft deterrent system | ||
| Operation check (key (electrical transmitter)) | ||
| Use simulation method to check | ||
| The remote air conditioning system does not operate even though a wireless door lock is performed when the remote A/C switch on the key (electrical transmitter) is pressed. | Data List (FL Door Courtesy, FR Door Courtesy, RL Door Courtesy SW, RR Door Courtesy SW, Back Door Courtesy SW) | |
| Data List (Hood Courtesy SW) | ||
| Data List (Start Switch1, Start Switch2) | ||
| Data List (IG SW, ACC SW) | ||
| Data List (Stop Light Switch) | ||
| Data List (Shift Position) | ||
| Theft deterrent system | ||
| Use simulation method to check | ||
| The remote air conditioning system stops operating shortly after the system starts. | Operation check | |
| Use simulation method to check | ||
| The remote air conditioning system starts operating by itself. | Use simulation method to check | |
| Operation check (activation control, stop control, key (electrical transmitter)) | ||
| Certification ECU | - | |
| A/C amplifier | ||
| Power management control ECU | ||
| The remote air conditioning system cannot be stopped using the remote A/C switch on the key (electrical transmitter). | Customize (Stop Pre A/C) | |
| Operation check (stop control, key (electrical transmitter)) | ||
| A/C amplifier | ||
| Power management control ECU | ||
| Certification ECU | - |
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*1: w/ Solar Ventilation System
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*2: w/ PTC Heater Assembly
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*3: w/ Remote Air Conditioning System