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 |
|---|---|---|
| No functions of A/C panel operate. | Air conditioning panel circuit | |
| LIN communication system | ||
| Air conditioning amplifier assembly | ||
| No functions of A/C system operate. | IG power source circuit | |
| Back-up power source circuit | ||
| Air conditioning panel circuit | ||
| Air conditioning amplifier assembly | ||
| Airflow control: No blower control (Blower motor does not operate). | Blower motor circuit | |
| Air conditioning panel circuit | ||
| Air conditioning amplifier assembly | ||
| Airflow control: No blower control (Blower motor does not change speed). | Blower motor circuit | |
| Air conditioning panel circuit | ||
| Air conditioning amplifier assembly | ||
| Temperature control: less cool air comes out. | Refrigerant shortage check using the GTS | |
| Refrigerant pressure | ||
| Cooler expansion valve | - | |
| Compressor with pulley assembly (for 1KR-FE) | ||
| Compressor with pulley assembly (for 1NR-FE) | ||
| Compressor with pulley assembly (for 1ND-TV) | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out. | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioner pressure sensor circuit | ||
| Compressor solenoid circuit | ||
| Air mix servo motor circuit (for driver side) | ||
| Air mix servo motor circuit (for front passenger side) | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Cooler expansion valve | - | |
| Air conditioning panel circuit | ||
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| LIN communication system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Temperature control: No warm air comes out. | Air mix servo motor circuit (for driver side) | |
| Air mix servo motor circuit (for front passenger side) | ||
| Room temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit (for 1KR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF) | ||
| PTC heater circuit*1 | ||
| Air conditioning panel circuit | ||
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| LIN communication system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Temperature control: Output air is warmer or cooler than set temperature. | Refrigerant volume | |
| Refrigerant pressure | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Automatic light control sensor circuit | ||
| Air mix servo motor circuit (for driver side) | ||
| Air mix servo motor circuit (for front passenger side) | ||
| Air inlet servo motor circuit | ||
| Engine coolant temperature sensor circuit (for 1KR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF) | ||
| Radiator unit sub-assembly | - | |
| Cooler expansion valve | - | |
| Air conditioning panel circuit | ||
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| LIN communication system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Temperature control: No temperature control (Only Max. cool or Max. warm). | Air mix servo motor circuit (for driver side) | |
| Air mix servo motor circuit (for front passenger side) | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Automatic light control sensor circuit | ||
| Air conditioning panel circuit | ||
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| LIN communication system | ||
| No air inlet control. | Air inlet servo motor circuit | |
| Air conditioning panel circuit | ||
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control. | Air outlet servo motor circuit | |
| Air conditioning harness circuit | ||
| Air conditioning amplifier assembly | ||
| Engine idle speed does not occur, or is continuous. | Compressor solenoid circuit | |
| Air conditioning panel circuit | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| LIN communication system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch turned off. | Back-up power source circuit | |
| Air conditioning amplifier assembly |
*1: w/ PTC Heater