AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS TABLE

Note

If the battery voltage is low, the PTC heater or ion generator may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.

w/o Stop and Start System: Click here

w/ Stop and Start System: Click here
If the battery voltage is low, the PTC heater or ion generator may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".

Click here
Before replacing the ECM, 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.

Air Conditioning System
Symptom	Suspected Area	Link
All functions of the air conditioning system do not operate	IG power source circuit	Click here
	Back-up power source circuit	Click here
	LIN communication circuit	Click here
	Air conditioning amplifier assembly	Click here
Air flow Control: No blower operation	Blower motor circuit	Click here
	LIN communication circuit	Click here
	Air conditioning amplifier assembly	Click here
Air flow control: No blower control	Blower motor circuit	Click here
	LIN communication circuit	Click here
	Air conditioning amplifier assembly	Click here
Air flow control: Insufficient air flow	Blower motor circuit	Click here
Air flow control: Insufficient air flow	Air conditioning amplifier assembly	Click here
Temperature control: Cooling effectiveness is poor	Refrigerant shortage check using the GTS	Click here
	Refrigerant volume	-
	Refrigerant pressure*10	Click here
	Refrigerant pressure*11	Click here
	Cooler expansion valve	Click here
	Cooler compressor assembly*8	Click here
	Compressor assembly with pulley*9	Click here
	Air conditioning amplifier assembly	Click here
Temperature control: No cool air comes out	Refrigerant shortage check using the GTS	Click here
	Refrigerant volume	-
	Refrigerant pressure*10	Click here
	Refrigerant pressure*11	Click here
	Air conditioner pressure sensor circuit	Click here
	LIN communication circuit	Click here
	Air mix damper control servo motor circuit (for driver side)	Click here
	Air mix damper control servo motor circuit (for front passenger side)	Click here
	Evaporator temperature sensor circuit	Click here
	Room temperature sensor circuit	Click here
	Ambient temperature sensor circuit	Click here
	Cooler expansion valve	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side air mix)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side air mix)	Click here
	Air conditioning harness assembly	Click here
	Cooler compressor assembly*8	Click here
	Compressor assembly with pulley*9	Click here
	Air conditioning amplifier assembly	Click here
	ECM*8	Click here
	ECM*9	Click here
Temperature control: No warm air comes out	LIN communication circuit	Click here
	Air mix damper control servo motor circuit (for driver side)	Click here
	Air mix damper control servo motor circuit (for front passenger side)	Click here
	Evaporator temperature sensor circuit	Click here
	Room temperature sensor circuit	Click here
	Ambient temperature sensor circuit	Click here
	PTC heater circuit*1	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side air mix)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side air mix)	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
	ECM*8	Click here
	ECM*9	Click here
Temperature control: Output air is warmer or cooler than the set temperature or response is slow	Refrigerant shortage check using the GTS	Click here
	Refrigerant volume	-
	Refrigerant pressure*10	Click here
	Refrigerant pressure*11	Click here
	Compressor solenoid circuit	Click here
	Room temperature sensor circuit	Click here
	Ambient temperature sensor circuit	Click here
	LIN communication circuit	Click here
	Air mix damper control servo motor circuit (for driver side)	Click here
	Air mix damper control servo motor circuit (for front passenger side)	Click here
	Air inlet damper control servo motor circuit	Click here
	PTC heater circuit*1	Click here
	Heater radiator unit sub-assembly	Click here
	Cooler expansion valve	Click here
	Automatic light control sensor	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side air mix)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side air mix)	Click here
	No. 1 blower damper servo sub-assembly	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
	ECM*8	Click here
	ECM*9	Click here
Temperature control: No temperature control (only MAX COLD or MAX HOT)	LIN communication circuit	Click here
	Air mix damper control servo motor circuit (for driver side)	Click here
	Air mix damper control servo motor circuit (for front passenger side)	Click here
	Room temperature sensor circuit	Click here
	Ambient temperature sensor circuit	Click here
	Evaporator temperature sensor circuit	Click here
	Automatic light control sensor	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side air mix)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side air mix)	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
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	Click here
	Refrigerant volume	-
	Refrigerant pressure*10	Click here
	Refrigerant pressure*11	Click here
	Air mix damper control servo motor circuit (for driver side)	Click here
	Air mix damper control servo motor circuit (for front passenger side)	Click here
	Automatic light control sensor	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side air mix)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side air mix)	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
No air inlet control	LIN communication circuit	Click here
	Air inlet damper control servo motor circuit	Click here
	No. 1 blower damper servo sub-assembly	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
No air flow mode control	LIN communication circuit	Click here
	Air outlet damper control servo motor circuit (for driver side)	Click here
	Air outlet damper control servo motor circuit (for front passenger side)	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Driver side mode)*3	Click here
	No. 1 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*2	Click here
	No. 2 air conditioning radiator damper servo sub-assembly (Driver side mode)*3	Click here
	No. 2 air conditioning radiator damper servo sub-assembly (Front passenger side mode)*2	Click here
	Air conditioning harness assembly	Click here
	Air conditioning amplifier assembly	Click here
Auto recirculation control function does not operate normally*4	Smog ventilation sensor circuit (for HC, CO)	Click here
	Smog ventilation sensor circuit (for NOx)	Click here
	Room temperature sensor circuit	Click here
	Ambient temperature sensor circuit	Click here
	Air inlet damper control servo motor circuit	Click here
	LIN communication circuit	Click here
	No. 1 blower damper servo sub-assembly	Click here
	Air conditioning harness assembly	Click here
	Radio receiver assembly (A/C control panel)*5	Click here
	Radio receiver assembly (A/C control panel)*6	Click here
	Air conditioning amplifier assembly	Click here
Quick heater assembly does not operate*1	PTC heater circuit	Click here
Quick heater assembly does not operate*1	Air conditioning amplifier assembly	Click here
Combination switch assembly (ECO mode switch) does not operate normally	ECO switch circuit	Click here
	Air conditioning amplifier assembly	Click here
Ion generator sub-assembly does not operate*7	Ion generator circuit	Click here
Ion generator sub-assembly does not operate*7	Air conditioning amplifier assembly	Click here
Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when the engine switch is turned off	Back-up power source circuit	Click here
	Air conditioning amplifier assembly	Click here

*1: w/ PTC Heater
*2: for LHD
*3: for RHD
*4: w/ Smog Ventilation Sensor
*5: w/ Navigation System
*6: w/ Audio and Visual System
*7: w/ Ion Generator
*8: w/o Stop and Start System
*9: w/ Stop and Start System
*10: for HFC-134a (R134a)
*11: for HFO-1234yf (R1234yf)