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 | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| A/C amplifier | ||
| Temperature control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Air mix damper control servo motor circuit (for Driver side) | ||
| Air mix damper control servo motor circuit (for Front passenger side) | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Room humidity sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Expansion valve | ||
| Radio receiver assembly (A/C control panel) | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 4 engine wire | ||
| Compressor with motor assembly | ||
| Power management control ECU (for LHD) | ||
| Power management control ECU (for RHD) | ||
| Temperature control: No warm air comes out | Air mix damper control servo motor circuit (for Driver side) | |
| Air mix damper control servo motor circuit (for Front passenger side) | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Room humidity sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| Exhaust heat recirculation system | ||
| CAN communication system | ||
| 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 (for Driver side) | ||
| Solar sensor circuit (for Front passenger side) | ||
| Room temperature sensor circuit | ||
| Room humidity sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air mix damper control servo motor circuit (for Driver side) | ||
| Air mix damper control servo motor circuit (for Front passenger side) | ||
| Air inlet damper control servo motor circuit | ||
| Air conditioning control panel circuit | ||
| Radiator unit sub-assembly | ||
| Expansion valve | ||
| Radio receiver assembly (A/C control panel) | ||
| Exhaust heat recirculation system | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 4 engine wire | ||
| Compressor with motor assembly | ||
| Power management control ECU (for LHD) | ||
| Power management control ECU (for RHD) | ||
| Temperature control: No temperature control (only Max. cool or Max. warm) | Air mix damper control servo motor circuit (for Driver side) | |
| Air mix damper control servo motor circuit (for Front Passenger side) | ||
| Room temperature sensor circuit | ||
| Room humidity sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Solar sensor circuit (for Driver side) | ||
| Solar sensor circuit (for Front passenger side) | ||
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| Heater performance is low (engine is stopped) | Heater water pump circuit | |
| A/C amplifier | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| Auto recirculation control function does not operate normally.*1 | Smog ventilation sensor circuit (for HC, CO) | |
| Smog ventilation sensor circuit (for NOx) | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air inlet damper control servo motor circuit | ||
| Air conditioning control panel circuit | ||
| Radio receiver assembly (A/C control panel) | ||
| A/C amplifier | ||
| A/C memory call function does not operate normally | CAN communication system | |
| A/C amplifier | ||
| Main body ECU | ||
| Certification ECU | - | |
| Diagnostic trouble codes (DTCs) are not stored. Set mode is cleared when power switch is off. | Back-up power source circuit | |
| A/C amplifier |
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*1: w/ Navigation System