Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. 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 if necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Air conditioning system
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer to |
|---|---|---|
| No functions of air conditioning control panel operate | LIN communication line | - |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| No functions of air conditioning system operate | A/C NO. 2 fuse | - |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Wire harness or connector | - | |
| Airflow Control: No blower control (Blower motor does not operate) | HTR H-fuse | - |
| Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| Wire harness or connector | - | |
| Airflow Control: No blower control (Blower motor does not change speed) | Blower motor circuit | BLOWER MOTOR CIRCUIT |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| Temperature Control: No cool air comes out | Refrigerant volume | REPLACEMENT |
| Refrigerant pressure | REPLACEMENT | |
| Air conditioning pressure sensor | DTC B1423/23 PRESSURE SENSOR CIRCUIT | |
| Air conditioning compressor magnetic clutch circuit | AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT | |
| Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| Air mix damper control servo motor circuit | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| Expansion valve | - | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| LIN communication line | - | |
| CAN communication system | PROBLEM SYMPTOMS TABLE | |
| Temperature Control: No warm air comes out | Air mix damper control servo motor circuit | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) |
| Air conditioning harness | - | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| LIN communication line | - | |
| CAN communication system | PROBLEM SYMPTOMS TABLE | |
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | Air inlet damper control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| Heater radiator | - | |
| Expansion valve | - | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM | HOW TO PROCEED WITH TROUBLESHOOTING | |
| LIN communication line | - | |
| CAN communication system | PROBLEM SYMPTOMS TABLE | |
| Temperature Control: No temperature control (Only Max. cool or Max. warm) | Air conditioning amplifier | TERMINALS OF ECU |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| LIN communication line | - | |
| No air inlet control | Air outlet damper control servo motor circuit | DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| Air inlet damper control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| Air conditioning amplifier | TERMINALS OF ECU | |
| No air flow mode control | Air outlet damper control servo motor circuit | DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Engine idle up does not occur, or is continuous | Air conditioning compressor magnetic clutch circuit | AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT |
| Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| Air conditioning control | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| LIN communication line | - | |
| Air conditioning amplifier | - | |
| ECM (for 2GR-FE) | HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM (for 1AR-FE) | HOW TO PROCEED WITH TROUBLESHOOTING | |
| A/C indicator blinking | Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT |
| Air conditioning amplifier | TERMINALS OF ECU | |
| Diagnostic trouble codes sre not recorded. Set mode is cleared when ignition switch turnes off | Air comditioning amplifier | TERMINALS OF ECU |
| Back-up power source circuit | BACK-UP POWER SOURCE CIRCUIT |