Lexus IS250 IS220d GSE20 ALE20 - AIR CONDITIONING
AIR CONDITIONING SYSTEM - PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | See page |
| All functions of the A/C system do not operate | 1. IG power source circuit | |
| 2. Back-up power source circuit | ||
| 3. A/C amplifier | - | |
| Air Flow Control: No blower operation | 1. Blower motor circuit | |
| 2. A/C amplifier | - | |
| Air Flow Control: No blower control | 1. Blower motor circuit | |
| 2. A/C amplifier | - | |
| Air Flow Control: Insufficient air flow | 1. Blower motor circuit | |
| 2. A/C amplifier | - | |
| Temperature Control: No cool air comes out | 1. Refrigerant volume | |
| 2. Refrigerant pressure | ||
| 3. Pressure switch circuit | ||
| 4. Low pressure sensor circuit | ||
| 5. Compressor circuit*1 | ||
| 6. Compressor lock sensor circuit*1 | ||
| 7. Compressor solenoid circuit | ||
| 8. Air mix control servo motor circuit (Driver side) | ||
| 9. Air mix control servo motor circuit (Passenger side) | ||
| 10. Evaporator temperature sensor circuit | ||
| 11. Room temperature sensor circuit | ||
| 12. Ambient temperature sensor circuit | ||
| 13. Expansion valve | ||
| 14. A/C amplifier | - | |
| 15. ECM*1 | - | |
| Temperature Control: No warm air comes out | 1. Air mix control servo motor circuit (Driver side) | |
| 2. Air mix control servo motor circuit (Passenger side) | ||
| 3. Evaporator temperature sensor circuit | ||
| 4. Room temperature sensor circuit | ||
| 5. Ambient temperature sensor circuit | ||
| 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 | |
| 2. Refrigerant pressure | ||
| 3. Solar sensor circuit (Driver side) | ||
| 4. Solar sensor circuit (Passenger side) | ||
| 5. Room temperature sensor circuit | ||
| 6. Ambient temperature sensor circuit | ||
| 7. Air mix control servo motor circuit (Driver side) | ||
| 8. Air mix control servo motor circuit (Passenger side) | ||
| 9. Cool air by-pass damper control servo motor circuit | ||
| 10. Air inlet control servo motor circuit | ||
| 11. Radiator unit sub-assembly | ||
| 12. Expansion valve | ||
| 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) | |
| 2. Air mix control servo motor circuit (Passenger side) | ||
| 3. Cool air by-pass damper servomotor circuit | ||
| 4. Room temperature sensor circuit | ||
| 5. Ambient temperature sensor circuit | ||
| 6. Evaporator temperature sensor circuit | ||
| 7. Solar sensor circuit (Driver side) | ||
| 8. Solar sensor circuit (Passenger side) | ||
| 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 | |
| 2. A/C amplifier | - | |
| No air inlet control | 1. Air inlet control servo motor circuit | |
| 2. A/C amplifier | - | |
| No air flow mode control | 1. Air outlet control servo motor circuit | |
| 2. A/C amplifier | - | |
| Engine idle up does not occur, or is continuous | 1. Compressor circuit*1 | |
| 2. Compressor lock sensor circuit*1 | ||
| 3. Compressor solenoid circuit | ||
| 4. A/C amplifier | - | |
| Blinking of A/C indicator | 1. Compressor solenoid circuit | |
| 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 | |
| 2. A/C amplifier | - |
*1: Except 2AD-FHV
LEXUS IS250, IS220d / GSE20 ALE20