Air Conditioning System Problem Symptoms Table

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

Air Conditioning System -- Problem Symptoms Table



AIR CONDITIONING SYSTEM
Symptom
Suspected area
See page
All functions of the A/C system do not operate
1. IG power source circuit
Click here
2. Back-up power source circuit
Click here
3. A/C amplifier
-
Air Flow Control: No blower operation
1. Blower motor circuit
Click here
2. A/C amplifier
-
Air Flow Control: No blower control
1. Blower motor circuit
Click here
2. A/C amplifier
-
Air Flow Control: Insufficient air flow
1. Blower motor circuit
Click here
2. A/C amplifier
-
Temperature Control: No cool air comes out
1. Refrigerant volume
Click here
2. Refrigerant pressure
Click here
3. Pressure switch circuit
Click here
4. Low pressure sensor circuit
Click here
5. Compressor circuit*1
Click here
6. Compressor lock sensor circuit*1
Click here
7. Compressor solenoid circuit
Click here
8. Air mix control servo motor circuit (Driver side)
Click here
9. Air mix control servo motor circuit (Passenger side)
Click here
10. Evaporator temperature sensor circuit
Click here
11. Room temperature sensor circuit
Click here
12. Ambient temperature sensor circuit
Click here
13. Expansion valve
Click here
14. A/C amplifier
-
15. ECM*1
-
Temperature Control: No warm air comes out
1. Air mix control servo motor circuit (Driver side)
Click here
2. Air mix control servo motor circuit (Passenger side)
Click here
3. Evaporator temperature sensor circuit
Click here
4. Room temperature sensor circuit
Click here
5. Ambient temperature sensor circuit
Click here
6. A/C amplifier
-
7. ECM*1
-
Temperature Control: Output air is warmer or cooler than the set temperature or response is slow.
1. Refrigerant volume
Click here
2. Refrigerant pressure
Click here
3. Solar sensor circuit (Driver side)
Click here
4. Solar sensor circuit (Passenger side)
Click here
5. Room temperature sensor circuit
Click here
6. Ambient temperature sensor circuit
Click here
7. Air mix control servo motor circuit (Driver side)
Click here
8. Air mix control servo motor circuit (Passenger side)
Click here
9. Cool air by-pass damper control servo motor circuit
Click here
10. Air inlet control servo motor circuit
Click here
11. Radiator unit sub-assembly
Click here
12. Expansion valve
Click here
13. A/C amplifier
-
14. ECM*1
-
Temperature control: No temperature control (only Max. cool or Max. warm)
1. Air mix control servo motor circuit (Driver side)
Click here
2. Air mix control servo motor circuit (Passenger side)
Click here
3. Cool air by-pass damper servomotor circuit
Click here
4. Room temperature sensor circuit
Click here
5. Ambient temperature sensor circuit
Click here
6. Evaporator temperature sensor circuit
Click here
7. Solar sensor circuit (Driver side)
Click here
8. Solar sensor circuit (Passenger side)
Click here
9. A/C amplifier
-
Engine coolant does not warm up quickly when the engine is cold. (PTC heater does not operate)*1
1. PTC heater circuit
Click here
2. A/C amplifier
-
No air inlet control
1. Air inlet control servo motor circuit
Click here
2. A/C amplifier
-
No air flow mode control
1. Air outlet control servo motor circuit
Click here
2. A/C amplifier
-
Engine idle up does not occur, or is continuous
1. Compressor circuit*1
Click here
2. Compressor lock sensor circuit*1
Click here
3. Compressor solenoid circuit
Click here
4. A/C amplifier
-
Blinking of A/C indicator
1. Compressor solenoid circuit
Click here
2. A/C amplifier
-
Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch is turned OFF.
1. Back-up power source circuit
Click here
2. A/C amplifier
-
  1. *1: Except 2AD-FHV