AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) PROBLEM SYMPTOMS TABLE
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 | ||
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control panel 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 | ||
| Cooler expansion valve | ||
| Cooler compressor assembly | ||
| Air conditioning amplifier assembly | ||
| Clean the cooling fans | ||
| Temperature control: No cool air comes out | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Air conditioner pressure sensor circuit | ||
| Air conditioning control panel circuit | ||
| Air mix damper control servo motor circuit | ||
| Evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Cooler expansion valve | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Air mix) | ||
| Air conditioning harness assembly | ||
| Cooler compressor assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| Temperature control: No warm air comes out | Air conditioning control panel circuit | |
| Air mix damper control servo motor circuit | ||
| Evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Air mix) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| 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 | ||
| Compressor solenoid circuit | ||
| Automatic light control sensor | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Air mix damper control servo motor circuit | ||
| Air inlet damper control servo motor circuit | ||
| Heater radiator unit sub-assembly | ||
| Cooler expansion valve | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Air mix) | ||
| Blower damper servo sub-assembly (Air inlet) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| Temperature control: No temperature control (only MAX COLD or MAX HOT) | Air conditioning control panel circuit | |
| Air mix damper control servo motor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Automatic light control sensor | ||
| No. 1 air conditioning radiator damper servo sub-assembly (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 shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Air mix damper control servo motor circuit | ||
| Automatic light control sensor | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Air mix) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air inlet control | Air conditioning control panel circuit | |
| Air inlet damper control servo motor circuit | ||
| Blower damper servo sub-assembly (Air inlet) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control | Air conditioning control panel circuit | |
| Air outlet damper control servo motor circuit | ||
| No. 1 air conditioning radiator damper servo sub-assembly (Air outlet) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Diagnostic Trouble Codes (DTCs) are not recorded. Set mode is cleared when the ignition switch is turned off | Back-up power source circuit | |
| Air conditioning amplifier assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| All functions of the rear air conditioning system do not operate | IG power source circuit | |
| Back-up power source circuit | ||
| Rear air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation | Rear blower motor circuit | |
| Rear air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control | Rear blower motor circuit | |
| Rear air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow | Rear blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out | Refrigerant shortage check using the GTS | |
| Refrigerant volume | - | |
| Refrigerant pressure | ||
| Air conditioner pressure sensor circuit | ||
| Rear air conditioning control panel circuit | ||
| Rear air mix damper control servo motor circuit | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear cooling unit expansion valve | ||
| Rear air mix damper servo sub-assembly | ||
| No. 2 air conditioning harness assembly | ||
| Cooler compressor assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| Temperature control: No warm air comes out | Rear air conditioning control panel circuit | |
| Rear air mix damper control servo motor circuit | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear air mix damper servo sub-assembly | ||
| No. 2 air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| 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 | ||
| Automatic light control sensor | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear air conditioning control panel circuit | ||
| Rear air mix damper control servo motor circuit | ||
| Rear cooling unit assembly | ||
| Rear cooling unit expansion valve | ||
| Rear air mix damper servo sub-assembly | ||
| No. 2 air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| Temperature control: No temperature control (only MAX COLD or MAX HOT) | Rear air conditioning control panel circuit | |
| Rear air mix damper control servo motor circuit | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Automatic light control sensor | ||
| Rear air mix damper servo sub-assembly | ||
| No. 2 air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control | Rear air conditioning control panel circuit | |
| Rear air outlet damper control servo motor circuit | ||
| No. 2 air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Diagnostic Trouble Codes (DTCs) are not recorded. Set mode is cleared when the ignition switch is turned off | Back-up power source circuit | |
| Air conditioning amplifier assembly |