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 | Link |
|---|---|---|
| All functions of the air conditioning system do not operate | IG power source circuit | |
| Back-up power source circuit | ||
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow Control: No blower operation | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| 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*4 | ||
| Refrigerant pressure*5 | ||
| Cooler expansion valve | ||
| 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*4 | ||
| Refrigerant pressure*5 | ||
| Air conditioner pressure sensor circuit | ||
| LIN communication 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 | ||
| Air conditioning wire | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side air mix) | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side air mix) | ||
| Air conditioning harness assembly | ||
| Compressor with motor assembly | ||
| Air conditioning amplifier assembly | ||
| Hybrid vehicle control ECU | ||
| ECM | ||
| Temperature control: No warm air comes out | LIN communication 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 | ||
| PTC heater circuit*1 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side air mix) | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side air mix) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Hybrid vehicle control ECU | ||
| ECM | ||
| 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*4 | ||
| Refrigerant pressure*5 | ||
| Solar sensor circuit | ||
| Air conditioning wire | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| LIN communication 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*1 | ||
| Heater radiator unit sub-assembly | ||
| Cooler expansion valve | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side air mix) | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side air mix) | ||
| No. 1 blower damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Hybrid vehicle control ECU | ||
| ECM | ||
| CAN communication system | ||
| Temperature control: No temperature control (only MAX COLD or MAX HOT) | LIN communication circuit | |
| 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 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side air mix) | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side air mix) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| CAN communication system | ||
| Temperature control: Output air temperature is different between left and right registers (the set temperature is the same for both) | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure*4 | ||
| Refrigerant pressure*5 | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Automatic light control sensor | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side air mix) | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side air mix) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air inlet control | LIN communication circuit | |
| Air inlet damper control servo motor circuit | ||
| No. 1 blower damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control | LIN communication circuit | |
| Air outlet damper control servo motor circuit (for driver side) | ||
| Air outlet damper control servo motor circuit (for front passenger side) | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Driver side mode)*2 | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*3 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side mode)*3 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*2 | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Quick heater assembly does not operate*1 | PTC heater circuit | |
| Air conditioning amplifier assembly | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when the power switch is turned off | Back-up power source circuit | |
| Air conditioning amplifier assembly |
*1: w/ PTC Heater
*2: for LHD
*3: for RHD
*4: for HFC-134a (R134a)
*5: for HFO-1234yf (R1234yf)