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 as 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	See
Entire A/C system does not operate	1. IG power source circuit	IG POWER SOURCE CIRCUIT
Entire A/C system does not operate	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Air Flow Control: No blower operation	1. Blower motor circuit	BLOWER MOTOR CIRCUIT
Air Flow Control: No blower operation	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Air Flow Control: No blower control	1. Blower motor circuit	BLOWER MOTOR CIRCUIT
Air Flow Control: No blower control	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Air Flow Control: Insufficient air output	1. Blower motor circuit	BLOWER MOTOR CIRCUIT
Air Flow Control: Insufficient air output	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Temperature Control: No cool air comes out	1. Volume of refrigerant	REFRIGERANT
	2. Refrigerant pressure	REFRIGERANT
	3. Pressure switch circuit	DTC B1423 Pressure Switch Circuit
	4. Air mix damper control servo motor circuit	DTC B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
	5. Air mix damper position sensor circuit	DTC B1431 Air Mix Damper Position Sensor Circuit (Passenger Side)
	6. Room temperature sensor circuit	DTC B1411 Room Temperature Sensor Circuit
	7. Room humidity sensor circuit	DTC B1462 Room Humidity Sensor Circuit
	8. Ambient temperature sensor circuit	DTC B1412 Ambient Temperature Sensor Circuit
	9. A/C inverter circuit	DTC B1471 A/C Inverter High Voltage Power Resource System Malfunction
	10. Air conditioning amplifier	AIR CONDITIONING UNIT
	11. Multiplex communication circuit
Temperature Control: No warm air comes out	1. Air mix damper control servo motor circuit	DTC B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
	2. Air mix damper position sensor circuit	DTC B1431 Air Mix Damper Position Sensor Circuit (Passenger Side)
	3. Ambient temperature sensor circuit	DTC B1412 Ambient Temperature Sensor Circuit
	4. Room temperature sensor circuit	DTC B1411 Room Temperature Sensor Circuit
	5. Room humidity sensor circuit	DTC B1462 Room Humidity Sensor Circuit
	6. Evaporator temperature sensor circuit	DTC B1413 Evaporator Temperature Sensor Circuit
	7. Air conditioning amplifier	AIR CONDITIONING UNIT
	8. Multiplex communication circuit
	9. Heater radiator	-
Temperature Control: Output air is warmer or cooler than set temperature or response is slow	1. Steering pad switch circuit	STEERING PAD SWITCH CIRCUIT
	2. Room temperature sensor circuit	DTC B1411 Room Temperature Sensor Circuit
	3. Room humidity sensor circuit	DTC B1462 Room Humidity Sensor Circuit
	4. Ambient temperature sensor circuit	DTC B1412 Ambient Temperature Sensor Circuit
	5. Solar sensor circuit	DTC B1421 Solar Sensor Circuit (Passenger Side)
	6. Air mix damper control servo motor circuit	DTC B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
	7. Air mix damper position sensor circuit	DTC B1431 Air Mix Damper Position Sensor Circuit (Passenger Side)
	8. Air conditioning amplifier	AIR CONDITIONING UNIT
	9. Multiplex communication circuit
Temperature Control: No temperature control (only Max. cool or Max. warm)	1. Steering wheel pad switch circuit	REFRIGERANT
	2. Air mix damper control servo motor circuit	DTC B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
	3. Air mix damper position sensor circuit	DTC B1431 Air Mix Damper Position Sensor Circuit (Passenger Side)
	4. Air conditioning amplifier	AIR CONDITIONING UNIT
No air inlet control	1. Air inlet damper control servo motor circuit	DTC B1442 Air Inlet Damper Control Servo Motor Circuit
	2. Air inlet damper position sensor circuit	DTC B1432 Air Inlet Damper Position Sensor Circuit
	3. Air conditioning amplifier	AIR CONDITIONING UNIT
No air outlet control	1. Air outlet damper control servo motor circuit	DTC B1443 Air Outlet Damper Control Servo Motor Circuit
	2. Air outlet damper position sensor circuit	DTC B1433 Air Outlet Damper Position Sensor Circuit
	3. Air conditioning amplifier	AIR CONDITIONING UNIT
Engine idle up does not occur, or is continuous	1. A/C inverter circuit	DTC B1471 A/C Inverter High Voltage Power Resource System Malfunction
	2. Air conditioning amplifier	AIR CONDITIONING UNIT
	3. Multiplex communication circuit
Displayed set temperature value does not match with operation of temperature control switch	1. Air conditioning amplifier	AIR CONDITIONING UNIT
Brightness does not change when rheostat volume or light control switch is adjusted	1. Illumination light system
	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Unable to access the diagnosis mode	1. Air conditioning amplifier	AIR CONDITIONING UNIT
DTC not recorded. Set mode is cleared when power switch is turned OFF.	1. Back-up power source circuit	BACK-UP POWER SOURCE CIRCUIT
	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Unable to control A/C with the steering pad switch	1. Steering pad switch circuit	STEERING PAD SWITCH CIRCUIT
Unable to control A/C with the steering pad switch	2. Air conditioning amplifier	AIR CONDITIONING UNIT
Unable to control A/C with the multi-display	1. Multiplex communication circuit
	2. Multi-display	-
	3. Air conditioning amplifier	AIR CONDITIONING UNIT
The heater performance is low (PTC heater does not function)*	1. PTC heater circuit	PTC HEATER CIRCUIT
	2. Heater water pump circuit	HEATER WATER PUMP CIRCUIT
	3. Air conditioning amplifier	AIR CONDITIONING UNIT
	4. Multiplex communication circuit

HINT:

*: The PTC heater operation may be stopped when an electrical load is large on the entire vehicle.