Tech Tips
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.
| 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 | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: Cooling effectiveness is poor | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Compressor with motor assembly | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out | Refrigerant shortage check using the GTS | |
| 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 | ||
| Ambient temperature sensor circuit | ||
| Cooler expansion valve | ||
| No. 4 engine wire | ||
| Compressor with motor assembly | ||
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| Power management control ECU | ||
| CAN communication system | ||
| 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 | ||
| Ambient temperature sensor circuit | ||
| PTC heater circuit | ||
| Heater radiator unit sub-assembly | ||
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| Power management control ECU | ||
| CAN communication system | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Solar sensor circuit (for driver side) | ||
| Solar sensor circuit (for front passenger side) | ||
| Room temperature 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 | ||
| PTC heater circuit | ||
| Heater radiator unit sub-assembly | ||
| Cooler expansion valve | ||
| No. 4 engine wire | ||
| Compressor with motor assembly | ||
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| Power management control ECU | ||
| CAN communication system | ||
| 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 | ||
| 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 | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Temperature control: Output air temperature is different between left and right resisters (the set temperature is the same for both) | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Solar sensor circuit (for driver side) | ||
| Solar sensor circuit (for front passenger side) | ||
| Air conditioning amplifier assembly | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Auto recirculation control function does not operate normally. | 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 | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Rear seat temperature cannot be adjusted*3 | Rear air mix control servo motor circuit | |
| Rear LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Ion generator assembly does not operate | Ion generator circuit | |
| Air conditioning control panel circuit | ||
| Multi-media module receiver assembly*1 | ||
| Radio receiver assembly*2 | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Heater performance is low (engine is stopped) | PTC heater circuit | |
| Air conditioning amplifier assembly | ||
| ECO mode switch (integration control and panel assembly) does not operate normally | ECO switch circuit | |
| Air conditioning amplifier assembly | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when power switch is off. | Back-up power source circuit | |
| Air conditioning amplifier assembly |
*1: w/ Multi-display
*2: w/o Multi-display
*3: for 3 Zone Type