Note
Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.
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 | ||
| Heat pump ECU assembly | ||
| Air flow Control: No blower operation | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Heat pump ECU assembly | ||
| Air flow control: No blower control | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Heat pump ECU assembly | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: Cooling effectiveness is poor | Compressor operates but cooling effectiveness is poor (High pressure reduction performed) | |
| Refrigerant pressure*3 | ||
| Refrigerant pressure*4 | ||
| Compressor operates but cooling effectiveness is poor (High pressure reduction not performed) | ||
| Compressor with motor assembly | ||
| Air conditioning amplifier assembly | ||
| Heat pump ECU assembly | ||
| Temperature control: No cool air comes out | Refrigerant volume | - |
| Refrigerant pressure*3 | ||
| Refrigerant pressure*4 | ||
| Compressor operates but cooling effectiveness is poor (High pressure reduction performed) | ||
| Air conditioner pressure sensor circuit | ||
| Air conditioner pressure sensor | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Evaporator temperature sensor | ||
| Cooler (room temp. sensor) thermistor | ||
| Thermistor assembly | ||
| 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 | ||
| Heat pump ECU assembly | ||
| Temperature control: No warm air comes out | Refrigerant volume | - |
| Refrigerant pressure*3 | ||
| Refrigerant pressure*4 | ||
| Air conditioner pressure sensor circuit | ||
| Compressor operates but heating effectiveness is poor (A/C switch off) | ||
| Compressor operates but heating effectiveness is poor (A/C switch on) | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Cooler (room temp. sensor) thermistor | ||
| Ambient temperature 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 | ||
| Hybrid vehicle control ECU | ||
| ECM | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume | - |
| Refrigerant pressure*3 | ||
| Refrigerant pressure*4 | ||
| Air conditioner pressure sensor circuit | ||
| Cooler (room temp. sensor) thermistor | ||
| Thermistor assembly | ||
| 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 | ||
| Heater radiator unit sub-assembly | ||
| Compressor operates but cooling effectiveness is poor (High pressure reduction not performed) | ||
| Compressor operates but heating effectiveness is poor (A/C switch off) | ||
| Compressor operates but heating effectiveness is poor (A/C switch on) | ||
| 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) | ||
| No. 1 blower damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Hybrid vehicle control ECU | ||
| ECM | ||
| Heat pump ECU assembly | ||
| Temperature control: No temperature control (only MAX COLD or MAX HOT) | Cooler (room temp. sensor) thermistor | |
| Thermistor assembly | ||
| LIN communication circuit | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| 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 | ||
| Temperature control: Output air temperature is different between left and right registers (the set temperature is the same for both) | Refrigerant volume | - |
| Refrigerant pressure*3 | ||
| Refrigerant pressure*4 | ||
| 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)*1 | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*2 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Driver side mode)*2 | ||
| No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*1 | ||
| Air conditioning harness assembly | ||
| 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: for LHD
*2: for RHD
*3: for HFC-134a (R134a)
*4: for HFO-1234yf (R1234yf)
| Symptom | Suspected Area | Link |
|---|---|---|
| Remote air conditioning system cannot be operated using an electrical key transmitter sub-assembly or smartphone (air conditioning system and hybrid control system are normal) | Wireless door lock control system | |
| Read the Data List (FR Door Courtesy SW, FL Door Courtesy SW, RR Door Courtesy SW, RL Door Courtesy SW, Back Door Courtesy SW) | ||
| Read the Data List (Hood Courtesy SW) | ||
| Read the Data List (Start Switch1, Start Switch2) | ||
| Read the Data List (IGB Request) | ||
| Read the Data List (FR Door Lock Pos, FL Door Lock Pos, RR-Door Lock Pos SW, RL-Door Lock Pos SW) | ||
| Operation check (start, stop) | ||
| Certification ECU (smart key ECU assembly) | - | |
| Main body ECU (multiplex network body ECU) | ||
| Use simulation method to check | ||
| Remote air conditioning system cannot be operated but the doors can be locked using an electrical key transmitter sub-assembly or smartphone (air conditioning system and hybrid control system are normal) | Read the Data List (FR Door Courtesy SW, FL Door Courtesy SW, RR Door Courtesy SW, RL Door Courtesy SW, Back Door Courtesy SW) | |
| Read the Data List (Hood Courtesy SW) | ||
| Read the Data List (Start Switch1, Start Switch2) | ||
| Read the Data List (IGB Request) | ||
| Read the Data List (Stop Light SW) | ||
| Read the Data List (Shift Position) | ||
| Certification ECU (smart key ECU assembly) | - | |
| Main body ECU (multiplex network body ECU) | ||
| Use simulation method to check | ||
| Remote air conditioning system stops immediately after it is started | Operation check (start, stop) | |
| Use simulation method to check | ||
| Air conditioning amplifier assembly | ||
| Remote air conditioning system operates unintentionally (electrical key transmitter sub-assembly and smartphone are not operated) | Operation check (start, stop) | |
| Air conditioning amplifier assembly | ||
| Main body ECU (multiplex network body ECU) | ||
| Certification ECU (smart key ECU assembly) | - | |
| Hybrid vehicle control ECU | ||
| Remote air conditioning system cannot be stopped using electrical key transmitter sub-assembly or smartphone | Operation check (stop) | |
| Air conditioning amplifier assembly | ||
| Main body ECU (multiplex network body ECU) | ||
| Certification ECU (smart key ECU assembly) | - | |
| Hybrid vehicle control ECU |